Abit Bx 133 User manual

MN-193-2A0-13

BX133

OverclockingGuide

ABIT Computer Corporation

Notice: All suggestions are only for reference, ABIT doesn’t guarantee

any hardware configuration beyond its specification.

Again, ABIT makes it possible!

ABIT is a company at the forefront of innovation. In the past, ABIT has developed

SoftMenu™, which brought jumperless technology to motherboards. ABIT was also the

first company which brought the Ultra DMA/66 technology to BX motherboards. ABIT is

now bringing forth the latest technological advancement for motherboards: “133 MHz for

All.” In order to meet the trend of higher frequencies on PC’s, ABIT is now equipping its’

products with 133 MHz capabilities. With special hardware designs and SoftMenu™III

technology, ABIT’s BE6-II & BF6 can provide users with a stable PC133 system.

Testing was completed by the NSTL, the leading independent microcomputer testing

laboratory. Due to some limitations of other peripheral devices, we suggest that the user set

up their system according to our instructions in the following sections. We trust you will

enjoy the enhanced performance of our products.

What is PC133

PC133 is the latest memory standard, increasing bus speeds 33% when compared to the

PC100. In the past, 133MHz speed was only available when users overclocked their system.

But users have previously found that they could not overclock their system to 133MHz

successfully due to set CPU, chipset and memory restrictions. The highest CPU FSB clock

was 100MHz. Chipsets and memory also only supported up to a 100MHz system bus clock.

The 133MHz CPU front side bus is now available and the memory standard has been

advanced to the higher 133MHz speed. The 133 MHz system is now ready for market.

What is SoftMenu™III technology?

SoftMenu™III is ABIT’s newest BIOS offering. The ABIT SoftMenu™III technology not

only lets users configure CPU settings easily, but also allows the user greater freedom in the

setting of the CPU FSB (Front Side Bus) clock settings.

How does SoftMenu™III help to provide a more stable PC133 system

ABIT SoftMenu™III provides the user with more CPU setting items, including settings for

I/O voltage, PCI/CPU FSB Clock, AGP/CPU FSB Clock, AGP Transfer Mode and 120

settings for the FSB clock. All of these setting items are adjustable, thereby giving the user

the power to adjust, according to system demands. This gives the user more choice and

flexibility while running the 133MHz system bus clock on BX motherboards. We will detail

these setting items in the following.

!Unlimited Front Side Bus (FSB)

In addition tothedefault settings for each processor speed, SoftMenu™IIIprovides 120

user-defined settings on the FSB clock. Settings are at 66, 75 and from 83 to 200 MHz.

The settings from 83MHz to 200MHz can be altered in increments of 1, giving the user

the power to find the best FSB setting, resulting in the best system performance. This

technology equips ABIT’s products with the most flexibility and greatest compatibility

to current and future specifications.

!CPU Multiplier Factor

From 2 to 8 (Increment 0.5). A total of 13 sets of multiplier factors support all current

CPUs and allows for support of future CPUs. The CPU operating frequency equals FSB

clock times the multiplier factor.

!PCI/CPU FSB Clock

½, 1/3, and now1/4is also aselection option. It correlates with the CPU FSB clock you

set. For example, if you set the CPU FSB clock to 100MHz and choose 1/3 here, the PCI

clock will be 33.3 MHz. We suggest you choose the ratio, which brings the PCIclock as

close to 33MHz as possible.

!AGP/CPU FSB Clock

1/1 and 2/3 options let the user adjust the AGP clock. We suggest you choose the ratio

which brings the AGP clock as close to 66MHz as possible.

!CPU Core Voltage

1.3 – 3.5 V manually adjustable but protected by SoftMenu™III from damaging the

CPU. If the “CPU Operating Frequency” is not set to “User define”, BIOS will

automatically set the voltage required by the CPU.

!I/O Voltage Adjustable (8 sets, 3.2-3.9 V)

This function allows the user to adjust the voltage supplied to DRAM, AGP, and the

Chipset, thus greatly increasing the possibility of higher performance. If the “CPU

Operating Frequency” is not set to “User define”, BIOS will automatically set the

voltage required by CPU.

!AGP Transfer Mode:

This function allows the user to determine the capability of the AGP device. Selecting

“Default” gives optimized performance. The video driver will decide the data transfer

mode automatically. If the CPU FSB clock exceeds 125MHz, setting AGP Transfer

Mode to “Normal” will result in a more stable system.

!In-Order Queue Depth

This item determines the command queue depth between processor and chipset.

Selecting “8” gives optimized performance. Selecting “1” results in a more stable

system.

!Level 2 Cache Latency

This item allows the user to set CPU L2 cache speed. Selecting “Default” gives the most

stable performance. Smaller latency gives faster performance, but may cause system

instability.

"Our Suggestion

We strongly suggest that you use our default settings for each processor speed when you

want to configure your CPU settings. We meticulously and repeatedly test these default

settings. Adopting these settings will give you the optimum system for stability. The

following table lists all of the CPU default settings.

CPU Speed FSB Clock PCI Clock / CPU FSB Clock AGP Clock / CPU FSB Clock

233 66 1/2( 33 ) 1/1 (66)

266 66 1/2 ( 33 ) 1/1 (66)

300 66 1/2 ( 33 ) 1/1 (66)

333 66 1/2 ( 33 ) 1/1 (66)

300 100 1/3 (33.3) 2/3 (66.67)

350 100 1/3 (33.3) 2/3 (66.67)

400 100 1/3 (33.3) 2/3 (66.67)

450 100 1/3 (33.3) 2/3 (66.67)

366 66 1/2 ( 33 ) 1/1 (66)

400 66 1/2 ( 33 ) 1/1 (66)

433 66 1/2 ( 33 ) 1/1 (66)

466 66 1/2 ( 33 ) 1/1 (66)

500 66 1/2 ( 33 ) 1/1 (66)

533 66 1/2 ( 33 ) 1/1 (66)

533 133 1/4 (33.25) 2/3 (88.67)

500 100 1/3 (33.33) 2/3 (66.67)

550 100 1/3 (33.33) 2/3 (66.67)

600 100 1/3 (33.33) 2/3 (66.67)

600 133 1/4 (33.25) 2/3 (88.67)

650 100 1/3 (33.33) 2/3 (66.67)

667 133 1/4 (33.25) 2/3 (88.67)

700 100 1/3 (33.33) 2/3 (66.67)

750 100 1/3 (33.33) 2/3 (66.67)

800 100 1/3 (33.33) 2/3 (66.67)

733 133 1/4 (33.25) 2/3 (88.67)

800 133 1/4 (33.25) 2/3 (88.67)

If you want to choose “user define” and configure every setting manually, please pay

attention to the following:

First, when you are selecting the “PCI/CPU FSB Clock”, please refer to the CPU FSB clock

you set and choose the ratio which brings the PCI clock as close to 33MHz as possible.

Second, when you are selecting the “AGP/CPU FSB clock”, please refer to the CPU FSB

you set and choose the ratio which brings the AGP clock as close to 66MHz as possible.

Finally for the PC133 system, we recommend the setting of the “PCI/CPU FSB Clock” to

“1/4”; the “AGP/CPU FSB Clock” to 2/3; the “AGP Transfer Mode” to “Normal”; and the

“In-Order Queue Depth” to “1.”

Supporting List

!AGP Cards

Testing Equipment:

CPU: Intel Coppermine 733 MHz ( 133 MHz FSB) OS: Win98 SE

Memory: TWINMOS Winbond 128M*3 PC-133 HDD: IBM DMVS-950

CD-ROM: Mitsumi 40X SCSI Card: Adaptec AHA-2940UW Pro

Sound Card: FIC Hi-Five Power Supply: High Power HPC-250G2

BIOS: beh_qj.bin

Vender/Model Name Chipset Result

Leadtek / S310 3Dfx Voodoo Banshee Pass

3Dfx / Voodoo3 2000 3Dfx Voodoo3 2000 Pass

3Dlabs / Oxygen VX1 3Dlabs Pass

ATI / 3D Range Pro ATI 3D Rage Pro Pass

ATI / Xpert 98 ATI 3D Rage Pro Pass

ASUS / V264GT3 ATI 3D Rate Pro Pass

ATI / XPERT 128 ATI Rage 128GL Pass

ABIT / GF 256 GeForce 256 Pass

ASUS / V6600 GeForce 256 Pass

Creative / CT6940 GeForce 256 Pass

ASUS/2740 Intel I740 Pass

Cardex / I740 Intel I740 Pass

Leadtek / S900 Intel I740 Pass

Matrox / G100 MGA G100 Pass

Matrox / Mystique MGA G200 Pass

Matrox / Millennium MGA G400 Pass

4Matrox / Millennium II Millennium Pass

Leadtek / L2300 Permedia II Pass

Leadtek / 3D S3500ZX RIVA 128ZX Pass

ASUS / V3400 RIVA TNT Pass

Creative / TNT RIVA TNT Pass

DIAMOND / Viper V550 RIVA TNT Pass

ELSA / ErazorII RIVA TNT Pass

Leadtek/ S320 RIVA TNT Pass

STB/Velocity4400 RIVA TNT Pass

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