Viglen Vig535b User manual

C O M P U T E R S N E T W O R K S S O L U T I O N S
..
Vig535b
Motherboard
Manual

Vig535b Motherboard Manual 1
Viglen,EMCandthe‘CE’mark
CE Marking
European standards are being harmonised across borders. If products comply with the same standards in all
European countries, product exporting and importing is made simple - paving our way to a common market. If
you buy a product with a 'CE' mark on it (shown below), on the box, in the manual, or on the guarantee - it
complies with the currently enforced directive(s).
Introduction to EMC
EMC (Electromagnetic Compatibility) is the term used to describe certain issues with RF (Radio Frequency)
energy. Electrical items should be designed so they do not interfere with each other through RF emissions. E.g.
If you turn on your microwave, your television shouldn't display interference if both items are CE marked to the
EMC directive.
If emitted RF energy is not kept low, it can interfere with other electrical circuitry - E.g. Cars Automatic Braking
Systems have been known to activate by themselves while in a strong RF field. As this has obvious
repercussions ALL electrical products likely to cause RF related problems have to be 'CE' marked from 1st
January 1996 onwards.
If a product conforms to the EMC directive, not only should its RF emissions be very low, but its immunity to RF
energy (and other types) should be high. The apparatus has to resist many 'real world' phenomena such as
static shocks and mains voltage transients.
Viglen’s Environment laboratory
To gain a 'CE' mark, the Viglen computer range has had to undergo many difficult tests to ensure it is
Electromagnetically Compatible. These are carried out in the in-house 'Environment lab' at Viglen Headquarters.
We have made every effort to guarantee that each computer leaving our factory complies fully with the correct
standards. To ensure the computer system maintains compliance throughout its functional life, it is essential you
follow these guidelines.
Install the system according to Viglen’s instructions
If you open up your Viglen:
Keep internal cabling in place as supplied.
Ensure the lid is tightly secured afterwards
Do not remove drive bay shields unless installing a 'CE' marked peripheral in its place
The clips or ‘bumps' around the lips of the case increase conductivity - do not remove or damage.
Do not remove the ferrite ring from the L.E.D cables.
Only use your Viglen computer with 'CE' marked peripherals
This system has been tested in accordance with European standards for use in residential and light industrial
areas-this specifies a 10 meter testing radius for emissions and immunity. If you do experience any adverse
affects which you think might be related to your computer, try moving it at least 10 meters away from the affected
item. If you still experience problems, contact Viglen’s Technical Support department who will put you straight
through to an EMC engineer - s/he will do everything possible to help. If modifications are made to your Viglen
computer system, it might breach EMC regulations. Viglen take no responsibility (with regards to EMC
characteristics) of equipment which has been tampered with or modified.

Vig535b Motherboard Manual 2
CopyrightsandTrademarks
Please note
The material in this manual is subject to change without notice.
Trademarks
Microsoft, Windows, Windows NT, Windows 95,Windows 98, Windows ME,
Windows 2000 Pro, Windows XP Pro and MS-DOS are registered trademarks of
Microsoft Corporation. IBM PC, XT, AT and PS/2 are trademarks of International
Business Machines Corporation. Pentium® and Pentium® Pro are registered
trademarks of Intel® Corporation. AMI BIOS is a registered trademark of American
Megatrends. All other trademarks are acknowledged. JAC-UP, Genie, Contender,
Dossier, Vig, Viglen, and Envy are trademarks of Viglen Limited.
Copyright and Patents
This manual and all accompanying software and documentation are copyrighted and
all rights reserved. This product, including software and documentation, may not, in
whole or in part, be copied, photocopied, translated or reduced to any electronic or
machine-readable form, without prior written consent except for copies retained by
the purchaser for backup.
© Copyright 2004 Viglen Limited
All Rights Reserved
VIG535B Manual Version 1.0
Printed in the United Kingdom
Liability
No warranty or representation, either expressed or implied, is made with respect to
this documentation, its quality, performance, merchantability or fitness for a particular
purpose. As a result the documentation is licensed as is, and you, the licensee, are
assuming the entire risk as to its quality and performance. The vendor reserves the
right to revise this operation manual and all accompanying software and
documentation and to make changes in the content without obligation to notify any
person or organisation of the revision or change.
In no event will the vendor be liable for direct, indirect, special, incidental or
consequential damages arising out of the use or inability to use this product or
documentation, even if advised of the possibility of such damages. In particular, the
vendor shall not have liability for any hardware, software or data stored or used with
the product, including the costs of repairing, replacing or recovering such hardware,
software or data.

Vig535b Motherboard Manual 3
Contents
Chapter 1: Motherboard Overview 5
Introduction 5
Feature Summary 6
System Board Components 15
Overview of System Board Components 16
Back Panel Connectors 20
Chapter 2: System Board Options 22
Overview of Jumper Settings 24
System Board Jumper Settings 25
Motherboard Connectors 27
Front Panel Connectors 28
Upgrading the CPU 29
Installing & Removing Memory Modules 30
Expansion Slots (PCI & AGP) 31
Replacing the Clock/CMOS RAM Battery 33
Chapter3:SolvingProblems 34
ResettingtheSystem 34
Troubleshooting Procedures 35
Problems Operating Add-in Boards 36
Problems & Suggestions 37
Chapter4:SystemBIOS 39
What is the BIOS? 39
The Power-On Sequence 39
Phoenix BIOS – Introduction 40
BIOSUpgrades 40
Using AWDFALSH to Update the BIOS 40
Configuring the Motherboard using BIOS Setup 42
BIOSSetupProgram 43
BIOS Menu Screen 44
MainMenu 45

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Main Menu items 45
Standard CMOS Features 46
Advanced BIOS Features 49
Advanced Chipset Features 51
DRAMTimingControl 51
AGP & P2P Bridge Control 52
OnChipAGPControl 53
VGAShareMemorySize 53
Integrated Peripherals 54
OnChipIDEDevice 54
OnChipPCIDevice 55
Onboard Super I/O Device 56
Onboard PCI Device 57
Power Management Setup 58
PMWakeupEvents 59
PnP/PCI Configurations 60
IRQResources 60
PCHealthStatus 62
Frequency/Voltage Control 63
Main Menu Additional Options 64
Chapter 5: Technical Information 65
Enhanced IDE 65
Operating Systems and Hard Drives 65
Power Supply Connector 67
Other Useful Connectors 67
OtherInformation 71
Reliability 71
Temperature 71
Chapter6:Glossary 72
Notes 74
Chapter7:Suggestions 75

Vig535b Motherboard Manual 5
Chapter1:MotherboardOverview
Introduction
This manual describes the Viglen VIG535B motherboard inside your computer. The
motherboard is the most important part of your computer. It contains all of the CPU,
memory and graphics circuitry that make the computer work.
The motherboard contains the very latest CPU design that supports the Intel®
Pentium® 4 family including Hyper-Threading enabled CPU’s and the very latest
Extreme Edition CPU’s. All of the supported CPU’s include Intel’s® MMX
Technology. MMX technology adds a total of 57 new instructions to the CPU, all of
which are designed to vastly improve both multimedia and communications on your
PC. The combination of the Intel® processor, MMX technology and Viglen expertise
make this a formidable computer.
This manual contains technical information about the Viglen VIG535B motherboard
and other hardware components inside your computer. If you are new to computers
we recommend that you read the user guide first. If you are an experienced
computer user this manual should provide all the information you will need to
perform simple upgrades and maintenance.
We hope that this manual is both readable and informative. If you have any
comments for suggestions about how we could improve the format then please fill
out the form at the back of the manual and send it to us.
Above all we hope that you enjoy using your Viglen computer.

Vig535b Motherboard Manual 6
Feature Summary
The Vig535b motherboard supports Intel® Pentium® 4 and Celeron® processors
with up to 1MB of second-level cache integrated in a micro PGA 478 Socket
package operating at speeds up to 3.4GHz.
The motherboard features:
Form factor:
•Micro ATX Form Factor: 243mm by 230mm
Processor:
•Single Pentium 4 CPU
•400/533/800MHz Quad-pumped bus
•Integrated 128, 256, 512 and 1000KB second-level cache
•Socket 478 connector.
Main memory:
•Four 184-pin DDR DIMM sockets.
•Support for up to 2GB of DDR DIMM memory.
Chipset
•SiS 661FX
•800Hz Front Side Bus (FSB)
•AGP 8x
•Support for 266/333/400MHz DDR RAM
•Advanced System Power Management features
•Integrated Super I/O Controller
•DirectSound AC97 Audio
•Dual bus master IDE Ultra DMA33/66/100/133
Audio
Audio Codec ’97 (AC ’97) compatible audio subsystem
LAN
Realtek 10/100 Mbit/sec Platform LAN Connect (PLC) device

Vig535b Motherboard Manual 7
Peripheral Interfaces
•Support for two Universal Serial Bus (USB) ports
•One serial port
•One parallel port
•Two IDE interfaces with Ultra DMA 33, ATA66/100/133 support.
•One diskette drive interface
•PS/2 keyboard and mouse ports
Expansion Capabilities
•Three PCI bus add-in card connectors
•One AGP Pro connector
Instantly Available PC
•Support for PCI Local Bus Specification Revision 2.2
•Suspend to RAM support
•Wake on PS/2 keyboard and USB ports
Wake on LAN Technology Connector
•Support for system wake up using an add-in network interface card with
remote wake up capability
Microprocessor
The motherboard supports a single Pentium 4 processor with HT technology. The
processor’s VID pins automatically program the voltage regulator on the
motherboard to the required processor voltage. In addition, the front side bus speed
is automatically selected. The motherboard currently supports processors that run
internally up to 3.4GHz and have a 128KB, 512KB or 1MB second-level cache
running at full CPU Speed.
The processor implements MMX ™ technology and maintains full backward
compatibility with the 8086, 80286, Intel386 ™, Intel486 ™, Pentium, Pentium Pro,
Pentium II & Pentium III processors. The processor’s numeric coprocessor
significantly increases the speed of floating-point operations and complies with
ANSI/IEEE standard 754-1985.
Microprocessor Packaging
The Pentium 4 processor comes in a FC-PGA package that connects to the
motherboard through a socket 478 connector. The package consists of:
•Processor card including the processor core and the second-level cache,
burst pipelined synchronous static RAM (BSRAM) and tag RAM.
•Thermal plate.

Vig535b Motherboard Manual 8
•Back cover.
Second Level Cache
The second-level cache is located on the die of the CPU itself. The cache includes
burst pipelined synchronous static RAM (BSRAM) and tag RAM. All supported
onboard memory can be cached.
Processor Upgrades
The motherboard can be upgraded with a Pentium 4 processor that runs at higher
speeds.
Memory
Main Memory
The motherboard has two DDR DIMM sockets. Minimum memory size is 128MB;
maximum memory size is 2GB. The BIOS automatically detects memory type, size,
and speed.
The motherboard supports the following memory features:
•184-pin DIMMs.
•266/333/400Mhz
•Un-Buffered Non-ECC DIMM.
RDRAM
Synchronous DRAM (SDRAM) improves memory performance through memory
access that is synchronous with the memory clock. This simplifies the timing design
and increases memory speed because all timing is dependent on the number of
memory clock cycles.
Chipset
The SiS 661FX chipset is the latest generation of desktop PCI set, it includes new
features such as –
•8x AGP Support
•ATA-133 IDE Hard drive support
•800MHz Front Size Bus support
•ACPI & On-Now

Vig535b Motherboard Manual 9
Accelerated Graphics Port (AGP)
The Vig535b features both integrated graphics and an AGP port. When using the
integrated graphics then a dynamic portion of the main system memory is used as
video memory. There is an optional GPA (Graphics Performance Accelerator)
modules which has a dedicated 4MB of video memory. You can also use any AGP
video card, with 4x/8x AGP performance.
The Accelerated Graphics Port (AGP) is a high-performance interconnect for
graphic-intensive applications, such as 3D applications. AGP is independent of the
PCI bus and is intended for exclusive use with graphical-display devices. AGP
overcomes certain limitations of the PCI bus related to handling a large amount of
graphics data with the following performance features:
•Pipelined-memory read and write operations that hide memory access
latency.
•Demultiplexing of address and data on the bus for near 100 percent bus
efficiency.
•AC timing for 133 MHz data transfer rates, allowing data throughput of 500
MB/sec.
Realtek 8100C Platform LAN Connect Device
The Realtek 8100C component provides an interface to the back panel RJ-45
connector with integrated LEDs. This physical interface may alternately be provided
via the CNR connector.
The Realtek 8100C provides the following functions:
•Basic 10/100 Ethernet LAN Connectivity
•Supports RJ-45 connector with status indicator LEDs
•Full driver compatibility
•Advanced Power Management support
•Programmable transit threshold
•Configuration EEPROM that contains the MAC address

Vig535b Motherboard Manual 10
RJ-45 LAN Connector LEDs
Two LEDs are built into the RJ-45 LAN connector. The following table describes the
LED states when the board is powered up and the LAN subsystem is operating.
Table 1: LAN LED Status
LED Colour LED State Condition
Green Off 10 Mbit/sec data rate is
selected.
Green On 100 Mbit/sec date rate is
selected.
Yellow Off LAN link is not
established.
Yellow On (steady state) LAN link is established.
Yellow On (brighter and pulsing) The computer is
communicating with
another computer on
the LAN.
Universal Serial Bus (USB)
The motherboard has four USB ports; one USB peripheral can be connected to each
port. For more than four USB devices, an external hub can be connected to either
port. The motherboard fully supports the universal host controller interface (UHCI)
and uses UHCI-compatible software drivers.
USB features include:
•Self-identifying peripherals that can be plugged in while the computer is
running.
•Automatic mapping of function to driver and configuration.
•Supports isochronous and asynchronous transfer types over the same set of
wires.
•Supports up to 127 physical devices.
•Guaranteed bandwidth and low latencies appropriate for telephony, audio,
and other applications.
•Error-handling and fault-recovery mechanisms built into the protocol.
Note:
Computer systems that have an unshielded cable attached to a USB port may not
meet FCC Class B requirements, even if no device or a low-speed (sub-channel)
USB device is attached to the cable. Use shielded cable that meets the
requirements for high-speed (fully rated) devices.
IDE Support
The motherboard has two independent bus-mastering PCI IDE interfaces. These
interfaces support PIO Mode 3, PIO Mode 4, ATAPI devices (e.g., CD-ROM), Ultra
DMA/33, Ultra DMA/66, Ultra DMA/100 & Ultra DMA/133 synchronous-DMA mode

Vig535b Motherboard Manual 11
transfers. The BIOS supports logical block addressing (LBA) and extended cylinder
head sector (ECHS) translation modes. The BIOS automatically detects the IDE
device transfer rate and translation mode.
Programmed I/O operations usually require a substantial amount of processor
bandwidth. However, in multitasking operating systems, the bandwidth freed by bus
mastering IDE can be devoted to other tasks while disk transfers are occurring.
LS-120 Support
LS-120 MB Diskette technology enables you to store 120MB of data on a single, 3.5”
removable diskette. LS-120 technology is backward (both read and write)
compatible with 1.44MB and 720KB DOS-formatted diskette and is supported by
Windows 95 and Windows NT operating system.
The Vig535b board allows connection of an LS-120 compatible drive and a standard
3½” floppy drive. The LS-120 drive can be configured as a boot device before a
floppy drive, if selected in the BIOS setup utility.
Note:
If you connect an LS-120 drive to an IDE connector and configure it as the “A” drive
and configure a standard 3.5” floppy as “B” drive, the standard floppy must be
connected to the floppy drive cable’s “A” connector (the connector at the end of the
cable).
The BIOS setup utility can be configured to boot firstly from either the LS120 or
standard 3½ “ floppy drive.
Real-Time Clock, CMOS SRAM, and Battery
The real-time clock is compatible with DS1287 and MC146818 components. The
clock provides a time-of-day clock and a multicentury calendar with alarm features
and century rollover. The real-time clock supports 256 bytes of battery-backed
CMOS SRAM in two banks that are reserved for BIOS use.
The time, date, and CMOS values can be specified in the Setup program. The
CMOS values can be returned to their defaults by using the Setup program.
An external coin-cell (CR 2032) battery powers the real-time clock and CMOS
memory. When the computer is not plugged into a wall socket, the battery has an
estimated life of three years. When the computer is plugged in, the 3.3-V standby
current from the power supply extends the life of the battery. The clock is accurate
to ±13 minutes/year at 25 ºC with 3.3 V applied.

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I/O Interface Controller
The motherboard uses the SMC FDC37C777 I/O controller which features:
•Serial ports:
Internal send/receive 16-byte FIFO buffer.
Four internal 8-bit DMA options for the UART with SIR support (USI).
•Multimode bidirectional parallel port:
Standard mode, IBM and Centronics compatible.
Enhanced parallel port (EPP) mode with BIOS and driver support.
High-speed extended capabilities port (ECP) mode.
•Floppy disk controller:
N82077 compatible.
Single diskette drive interface.
16-byte FIFO.
High-performance digital data separator (DDS).
PC-AT and PS/2 drive-mode support.
•Keyboard and mouse controller:
Industry standard 8042A compatible.
General-purpose microcontroller.
8-bit internal data bus.
•ISA Plug-and-Play compatible register set.
•PCI PME interface.
•Intelligent auto power management:
Shadowed write-only registers for ACPI compliance.
Programmable wake up event interface.
By default, the I/O controller interfaces are automatically configured during boot up.
The I/O controller can also be manually configured in the Setup program.
Serial Ports
Two 9-pin D-Sub serial port connector are located on the back panel and is
compatible with NS16C550 UARTs.
Parallel Port
The connector for the multimode bidirectional parallel port is a 25-pin D-Sub
connector located on the back panel. In the Setup program, the parallel port can be
configured for the following:
•Compatible (standard mode).
•Bidirectional (PS/2 compatible).
•Extended Parallel Port (EPP).
•Enhanced Capabilities Port (ECP).

Vig535b Motherboard Manual 13
Floppy Controller
The I/O controller is software compatible with the N82077 floppy drive controllers
and supports both PC-AT and PS/2 modes. In the Setup program, the floppy
interface can be configured for the following floppy drive capacities and sizes:
•1.25/1.44 MB, 3.5-inch
PS/2 Keyboard and Mouse Interface
PS/2 keyboard and mouse connectors are located on the back panel. The +5 V lines
to these connectors are protected with a PolySwitch circuit that, like a self-healing
fuse, re-establishes the connection after an over-current condition is removed.
The keyboard controller supports the hot-key sequence <Ctrl><Alt><Del> for a
software reset. This key sequence resets the computer’s software by jumping to the
beginning of the BIOS code and running the Power-On Self Test (POST).
Audio Subsystem
The Vig535b board has multiple AC ’97 V 1.03 compliant audio features including an
Analog Devices ALC 655 codec.
The audio subsystem includes these features:
•Split digital/analog architecture for improved S/N (signal-to-noise) ratio: ≥85dB –
measured at line out, from any analog input, including line in, CD-ROM, and
auxiliary line in.
•3-D stereo enhancement
•Power management support for APM 1.2 and ACPI 1.0 (driver dependant)
•Audio inputs:
oFour analog line-level stereo inputs for connection from line in, CD, video
source line in and aux
oTwo analog line-level inputs for speakerphone input and PC beep
oOne mono microphone input
•Audio outputs:
oStereo line-level output
oMono output for speakerphone

Vig535b Motherboard Manual 14
Management Extension Component
System BIOS
The system BIOS, from Phoenix Technology, provides ISA and PCI compatibility.
The BIOS is contained in a flash memory device on the system board. The BIOS
provides the power-on self test (POST), the system Set-up program, a PCI and IDE
auto-configuration utility, and BIOS recovery code.
PCI Auto Configuration
The PCI auto-configuration utility works in conjunction with the Set-up program to
support using PCI add-in boards in the system. When you turn on the system power
after installing a PCI board, the BIOS automatically configures interrupts, DMA
channels, I/O space, and so on. Since PCI add-in boards use the same interrupt
resources as ISA add-in boards, you must specify the interrupts used by ISA boards
in the set-up program. The PCI auto-configuration program complies with version 2.1
of the PCI BIOS specification.
IDE Auto Configuration
If you install an IDE drive in the system, the IDE auto-configuration utility
automatically detects and configures the drive for operation in the system. This
utility eliminates the need to enter the Set-up program after you install an IDE drive.
Expansion Slots
The system has five PCI bus add-in card connectors and One AGP universal
connector.

Vig535b Motherboard Manual 15
System Board Components
Figure 1: Motherboard Layout & Components
PGA 478
Socket
Super
I/O
BIOS
SiS 661FX
SiS
964L
A
B
C
D
E
FGHIJK
L
M
N
O
P
Q
R
S
T
U
VWXYZAA
BB
CC
DD
EE
FF
Table 2: Motherboard Connection
A: Audio Q: Jumper 1
B: USB and LAN R: Panel 1
C: USB S: Battery
D: VGA, LPT and COM1 T: Jumper 3
E: PS/2 U: South bridge SiS 964L
F: ATX 4 pin V: Front Panel USB connector
G: Clock Generator W: Front Panel USB connector
H: North Bridge SiS 661FX X: Speaker
I: CPU Fan Y: Case Fan 1
J: DIMM socket 1 and 2 Z: Auxiliary line audio input connector
K: ATX 20 pin AA: Front Panel Audio
L: Case Fan 2 BB: Audio Codec ALC 655
M: COM2 CC: LAN controller
N: IDE1 DD: PCI slot’s
O: Floppy Drive 1 EE: AGP slot
P: IDE2 FF: 478 pin CPU socket

Vig535b Motherboard Manual 16
Overview of System Board Components
A - External Audio Socket
Situated at the rear of the motherboard, this has three 3.5mm jack sockets. The blue
socket is the line in, the green socket is line out and the pink is the mic.
B – USB and LAN
This provides 2 USB ports as well as a 10/100 Ethernet port.
C – USB
This provides 2 addition USB ports.
D – LPT, Serial and a VGA ports
This allows a printer to be connected. The serial port allows a serial device to be
attached such as external modem. The VGA port allows a monitor to be attached
using the on board graphics hardware.
E – PS/2 keyboard and mouse
Allows a PS/2 mouse and keyboard to be attached.
F – 4-pin ATX power connector
Provides additional power to the AGP Slot
G – Clock generator
Keeps the system in sync
H – North Bridge
The SIS ® 611FX provides the processor interface with 800/533/400 MHz frequency,
support for Intel ® Hyper-Threading Technology, system memory interface at
266MHz operation, and 1.5V AGP interface that supports AGP 2.0 specification
including 8x Fast Write protocol.
I – CPU fan connector
Allows a CPU fan to be connected.

Vig535b Motherboard Manual 17
J – 2x DDR DIMM slots
This allows up to 2GB of DDR RAM to be installed. Up to 1GB of RAM in each slot.
K – 20-pin ATX power connector
This is the main power connector.
L – Power Fan Connector
This allows the power unit fan to be connected to the motherboard. (Case
dependent)
M – Comm 2
Allows an additional serial port to be added. (Additional hardware required)
N – Primary IDE port
This allows up to 2 devices, such as CD/DVD drives and hard drives to be added
to the IDE channel. The port is slotted to ensure correct installation.
O – Floppy drive connector
This allows a floppy drive to be added to the motherboard. The port is slotted to
ensure correct installation.
P – Secondary IDE port
This allows and additional 2 IDE device to be added to the motherboard. The port is
slotted to ensure correct installation.
Q – Jumper 1 (Red)
This allows the CMOS to be cleared. Read the section regarding the BIOS and
CMOS. The default position of the jumper is covering pin 1 and 2. (see figure 3)
R – Panel 1
This is the panel to which the case cables are connected, such as the power switch,
Power LED etc..
S – Battery
The battery keeps the CMOS memory when the system isn’t turned on.

Vig535b Motherboard Manual 18
T – Jumper 3
This allows the BIOS to rewritable. Read the section regarding the BIOS the default
position of the jumper is covering pin 1 and 2. (see figure 3)
U – South bridge
The SIS ® 964L integrated peripheral controller supports various I/O functions
including 2-channel ATA/133 bus master IDE controller, up to six USB 2.0 ports,
LPC Super I/O interface, AC’97 interface and PCI 2.2 interface.
V – Internal USB3 header
This allows an additional 2 USB ports to be added with the use of a cable.
W – Internal USB4 header
This allows an additional 2 USB ports to be added with the use of a cable.
X – Internal Speaker header
Allows a case speaker to be added to the motherboard.
Z – Internal Audio header
Allows the audio from the CD ROM to be run though the internal audio via an
analogue cable.
AA – Front Panel Audio
Allows a front facing audio panel to be fitted.
BB – Audio Codec
Decodes different audio formats.
CC – LAN controller
On board NIC
DD – PCI slot
Allows a PCI device to be fitted such as a fire wire card or wireless card.

Vig535b Motherboard Manual 19
EE – AGP slot
Allows an AGP device to be fitted such as a graphics card.
FF - 478 Intel CPU socket
This the socket in which the CPU is installed into.