MSI G Series User manual

G Series
LCD Monitor
G321CU(3DC5)
User Guide

2Contents
Contents
Getting Started.............................................................................................................. 3
Package Contents................................................................................................... 3
Installing the Monitor Stand................................................................................... 4
Adjusting the Monitor ............................................................................................. 5
Monitor Overview.................................................................................................... 6
Connecting the Monitor to PC ................................................................................ 8
OSD Setup ..................................................................................................................... 9
Navi Key .................................................................................................................. 9
Hot Key.................................................................................................................... 9
OSD Menus.................................................................................................................. 10
Gaming.................................................................................................................. 10
Professional ......................................................................................................... 13
Image .................................................................................................................... 14
Input Source ......................................................................................................... 15
PIP/PBP ................................................................................................................ 16
Navi Key ................................................................................................................ 17
Setting................................................................................................................... 18
Specifications.............................................................................................................. 20
Preset Display Modes ................................................................................................ 22
Troubleshooting.......................................................................................................... 25
Safety Instructions...................................................................................................... 26
TÜV Rheinland Certification....................................................................................... 28
Regulatory Notices..................................................................................................... 29
Revision
V1.0, 2022/10

3
Getting Started
Getting Started
This chapter provides you with the information on hardware setup procedures. While
connecting devices, be careful in holding the devices and use a grounded wrist strap
to avoid static electricity.
Package Contents
Monitor G321CU
Documentation Quick Start Guide
Accessories
Stand with Screw(s)
Stand Base with Screw(s)
Wall Mount Screw(s)
Power Cord
External Power Supply
Cables Ultra High Speed HDMI™ Cable
⚠
Important
∙ Contact your place of purchase or local distributor if any of the items is damaged or
missing.
∙ Package contents may vary by country.
∙ The included power cord is exclusively for this monitor and should not be used with
other products.

4Getting Started
Installing the Monitor Stand
1. Leave the monitor in its protective foam packaging. Align the stand bracket to the
monitor groove. Tighten the stand bracket with screws.
2. Connect the base to the stand and tighten the base screw to secure the base.
3. Make sure the stand assembly is properly installed before setting the monitor
upright.
2
1
⚠
Important
∙ Remove the screws on the monitor groove if needed before installing the stand.
∙ Place the monitor on a soft, protected surface to avoid scratching the display panel.
∙ Do not use any sharp objects on the panel.
∙ The groove for installing the stand bracket can also be used for wall mount. Please
contact your dealer for proper wall mount kit.
∙ This product comes with NO protective film to be removed by the user! Any
mechanical damages to the product including removal of the polarizing film may
affect the warranty!

5
Getting Started
Adjusting the Monitor
This monitor is designed to maximize your viewing comfort with its adjustment
capabilities.
⚠
Important
Avoid touching the display panel when adjusting the monitor.
-5
O
20
O

6Getting Started
Monitor Overview
1
23
8 9
457
6

7
Getting Started
1Power Button
2Navi Key
3Kensington Lock
4HDMI™ Connector
Supports HDMI™ CEC, 4K@144Hz as specified in HDMI™ 2.1.
5HDMI™ Connector
Supports 4K@144Hz as specified in HDMI™ 2.1.
6DisplayPort
Supports a maximum resolution of 4K @144Hz.
7
USB Type-C Port
This port supports DisplayPort Alternate (DP Alt) Mode and up to 5V/3A
(15W) power delivery. It only carries video signals and doesn’t support data
transmission function.
8Headphone Jack
9Power Jack

8Getting Started
Connecting the Monitor to PC
1. Turn off your computer.
2. Connect the video cable from the monitor to your computer.
3. Assemble the external power supply & power cord. (Figure A)
4. Connect the external power supply to the monitor power jack. (Figure B)
5. Plug the power cord into the electrical outlet. (Figure C)
6. Turn on the monitor. (Figure D)
7. Power on the computer and the monitor will auto detect the signal source.
AA
B
A
C
D

9
OSD Setup
OSD Setup
This chapter provides you with essential information on OSD Setup.
⚠
Important
All information is subject to change without prior notice.
Navi Key
The monitor comes with a Navi Key, a multi-directional control that helps navigate the
On-Screen Display (OSD) menu.
OK
Up/Down/Left/Right:
∙selecting function menus and items
∙adjusting function values
∙entering into/exiting from function menus
Press (OK):
∙launching the On-Screen Display (OSD)
∙entering submenus
∙confirming a selection or setting
Hot Key
∙Users may enter into preset function menus by moving the Navi Key up, down, left or
right when the OSD menu is inactive.
∙Users may customize their own Hot Keys to enter into different function menus.

10 OSD Menus
OSD Menus
⚠
Important
The following settings will be grayed out when HDR signals are received:
∙ Night Vision ∙ Contrast
∙ MPRT Sync ∙ Color Temperature
∙ Low Blue Light ∙ Optix Scope
∙ HDCR ∙ PIP/PBP
∙ Brightness
Gaming
1st Level Menu 2nd/3rd Level Menu Description
Game Mode User ∙Use Up or Down Button to select and
preview mode effects.
∙Press the OK Button to confirm and
apply your mode type.
FPS
Racing
RTS
RPG
Night Vision OFF ∙This function optimizes background
brightness and is recommended for
FPS games.
Normal
Strong
Strongest
A.I.

11
OSD Menus
1st Level Menu 2nd/3rd Level Menu Description
Response Time Normal ∙Activating the following functions will
affect Response Time:
Activated Function Response Time Status
»MPRT Sync
»PIP/PBP Unable to select
Fast
Fastest
MPRT Sync OFF ∙Activating MPRT Sync will affect:
Affected Function Function Status
»Response Time
»Brightness Unable to select
»HDCR
»PIP/PBP
»Optix Scope
Set to OFF
»Screen Size 1:1
Set to Auto
»Type C PD Charge Set to OFF &
unable to select
∙MPRT Sync is available when the
refresh rate is over 85Hz.
ON
Refresh Rate Location Left Top ∙Location is adjustable in OSD Menu.
Press the OK Button to confirm and
apply your Refresh Rate Location.
∙This monitor follows and works at the
Operating System’s preset Screen
Refresh Rate.
Right Top
Left Bottom
Right Bottom
Customize
OFF
ON
Alarm Clock Location Left Top ∙After setting the time, press the OK
Button to activate the timer.
∙Users have to manually restore their
preset Alarm Clock after any AC
power loss and reconnection.
Right Top
Left Bottom
Right Bottom
Customize
OFF
15:00 00:01 ~ 99:59
30:00
45:00
60:00

12 OSD Menus
1st Level Menu 2nd/3rd Level Menu Description
Smart
Crosshair
Icon None ∙Through AI algorithm, this function
enhances the visibility of in-game
crosshair.
∙Smart Crosshair and Optix Scope can
be enabled at the same time.
Color White
Red
Auto
Position
Reset
Optix Scope Scope Size Small ∙The center point will zoom in when
Optix Scope is enabled, user can
adjust the details through the “Scope
Size” and “Scope Ratio” settings.
∙Smart Crosshair and Optix Scope can
be enabled at the same time.
∙Activating Optix Scope will affect:
Affected Function Function Status
»MPRT Sync
»FreeSync Premium
»PIP/PBP
Set to OFF
»Screen Size 1:1 Set to Auto
Medium
Large
Scope
Ratio
x1.5
x2
x4
OFF
ON
FreeSync
Premium
OFF ∙FreeSync Premium prevents screen
tearing.
∙Activating FreeSync Premium will affect:
Affected Function Function Status
»PIP/PBP
»Optix Scope Set to OFF
»Screen Size 1:1 Set to Auto
(adjustable)
ON

13
OSD Menus
Professional
1st Level Menu 2nd Level Menu Description
Pro Mode User ∙Use Up or Down Button to select and
preview mode effects.
∙Press the OK Button to confirm and apply
your mode type.
Anti-Blue
Movie
Office
sRGB
Eco
Low Blue Light OFF ∙Low Blue Light protects your eyes against
blue light. When enabled, Low Blue Light
adjusts the screen color temperature to a
more yellow glow.
∙When Pro Mode is set to Anti-Blue, it is
mandatory to enable Low Blue Light.
ON
HDCR OFF ∙HDCR enhances image quality by
increasing the contrast of images.
∙Activating HDCR will affect:
Affected Function Function Status
»Brightness Unable to select
»MPRT Sync Set to OFF
ON
MPRT Sync OFF ∙Activating MPRT Sync will affect:
Affected Function Function Status
»Response Time
»Brightness Unable to select
»HDCR
»PIP/PBP
»Optix Scope
Set to OFF
»Screen Size 1:1 Set to Auto
»Type C PD Charge Set to OFF &
unable to select
∙MPRT Sync is available when the refresh
rate is over 85Hz.
ON
Image
Enhancement
OFF ∙Image Enhancement enhances image
edges to improve their acutance.
Weak
Medium
Strong
Strongest

14 OSD Menus
Image
1st Level Menu 2nd/3rd Level Menu Description
Brightness 0-100 ∙Properly adjust Brightness
according to the surrounding
lighting.
∙Activating the following functions
will affect Brightness:
Activated Function Brightness Status
»MPRT Sync
»HDCR Unable to select
Contrast 0-100 ∙Properly adjust Contrast to relax
your eyes.
Sharpness 0-5 ∙Sharpness improves clarity and
details of images.
Color
Temperature
Cool ∙Use Up or Down Button to select
and preview mode effects.
∙Press the OK Button to confirm and
apply your mode type.
∙Users can adjust Color
Temperature in Customization
mode.
Normal
Warm
Customization R (0-100)
G (0-100)
B (0-100)
Screen Size Auto ∙Users can adjust Screen Size in
any mode, any resolution and any
screen refresh rate.
∙Activating Screen Size 16:10 will
affect:
Affected Function Function Status
»HDMI™ 2.1 Unable to select
∙Activating Screen Size 1:1 will
affect:
Affected Function Function Status
»MPRT Sync
»FreeSync Premium
»PIP/PBP
»Optix Scope
Set to OFF
4:3
16:9
16:10
1:1

15
OSD Menus
Input Source
1st Level Menu 2nd Level Menu Description
HDMI™1 ∙Users can adjust Input Source in any mode.
HDMI™2
DP
Type C
Auto Scan OFF ∙Users can use the Navi Key to select Input
Source at below status:
• While “Auto Scan” is set to “OFF” with the
monitor at power saving mode;
• While “No Signal” message box is shown
on the monitor.
ON

16 OSD Menus
PIP/PBP
1st Level Menu 2nd/3rd Level Menu Description
OFF ∙PIP (Picture in Picture) allows users
to simultaneously display multiple
video sources on one screen. One
program is displayed on the full
screen at the same time as one or
more other programs are displayed
in inset windows.
∙PBP (Picture by Picture) is a similar
feature that displays two input
sources side-by-side on the screen.
∙Display Switch allows users to
switch between primary and
secondary input sources.
∙If there is only one signal input, the
Display Switch and Audio Switch will
be grayed out.
∙Users can adjust the ratio of window
division by switching mode 1/ 2.
∙Activating PIP/PBP will affect:
Affected Function Function Status
»Response Time
»HDMI™ 2.1 Unable to select
»MPRT Sync
»FreeSync Premium
»Optix Scope
Set to OFF
»HDMI™ CEC Set to OFF &
unable to select
»PIP:
Screen Size
16:10/ 1:1
»PBP:
Screen Size
4:3/ 16:9/ 16:10/ 1:1
Set to Auto & unable
to select
PIP Source HDMI™1
HDMI™2
DP
Type C
PIP Size Small
Medium
Large
Location Left Top
Right Top
Left Bottom
Right Bottom
Customize
Display Switch
Audio Switch
PBP Mode 1
Mode 2
Source 1 HDMI™1
HDMI™2
DP
Type C
Source 2 HDMI™1
HDMI™2
DP
Type C
Display Switch
Audio Switch

17
OSD Menus
Navi Key
1st Level Menu 2nd Level Menu Description
Up
Down
Left
Right
OFF ∙All Navi Key items can be adjusted via OSD
Menus.
Brightness
Game Mode
Smart Crosshair
Alarm Clock
Input Source
PIP/PBP Mode
Refresh Rate
Info. On Screen
Night Vision
Optix Scope

18 OSD Menus
Setting
1st Level Menu 2nd Level Menu Description
Language 繁體中文 ∙Users have to press the OK Button to
confirm and apply the Language setting.
∙Language is an independent setting.
Users’ own language setting will override
the factory. When users set Reset to Yes,
Language will not be changed.
English
Français
Deutsch
Italiano
Español
한국어
日本語
Русский
Português
简体中文
Bahasa
Indonesia
Türkçe
(More languages
coming soon)
Transparency 0~5 ∙Users can adjust Transparency in any
mode.
OSD Time Out 5~30s ∙Users can adjust OSD Time Out in any
mode.
Power Button OFF ∙When set to OFF, users can press the
power button to turn off the monitor.
∙When set to Standby, users can press the
power button to turn off the panel and
backlight.
Standby
Info. On Screen OFF ∙The information of the monitor status will
be shown on the right side of the screen.
ON
HDMI™ 2.1 4K 120Hz -
Console
∙To reach maximum resolution of
3840x2160 @144Hz, users have to set
HDMI™ 2.1 to 4K 144Hz - PC.
∙Activating the following functions will
affect HDMI™ 2.1:
Activated Function HDMI™ 2.1 Status
»PIP/PBP Unable to select
4K 144Hz - PC

19
OSD Menus
1st Level Menu 2nd Level Menu Description
HDMI™ CEC OFF ∙HDMI™ CEC (Consumer Electronics
Control) supports Sony PlayStation®,
Nintendo® Switch™, Xbox Series X|S
consoles and various audio-visual devices
that are CEC-capable.
∙If HDMI™ CEC is set to ON:
• The monitor will automatically power
on when the CEC device is turned on.
• The CEC device will enter power saving
mode when the monitor is turned off.
• When Sony PlayStation®, Nintendo®
Switch™, or Xbox Series X|S console is
connected, Game Mode and Pro Mode
will be automatically set to default
modes and can be adjusted to users’
preferred modes later.
∙Activating the following functions will
affect HDMI™ CEC:
Activated Function HDMI™ CEC Status
»PIP/PBP Set to OFF &
unable to select
ON
Type C PD Charge OFF ∙This function supports charging devices
through a USB Type-C connector with up
to 15W (5V/3A) power delivery.
∙Activating the following functions will
affect Type C PD Charge:
Activated Function Type C PD Charge Status
»MPRT Sync Set to OFF &
Unable to select
ON
Reset YES ∙Users can Reset and restore settings to
original OSD Default in any mode.
NO

20 Specifications
Specifications
Model G321CU
Size 31.5 inch
Curvature 1500R
Panel Type VA
Resolution 3840x2160 (UHD)
Aspect Ratio 16:9
Brightness 300 nits (typ.)
Contrast Ratio 3000 : 1
Refresh Rate 144Hz
Response Time ∙1ms (MPRT)
∙4ms (GTG)
I/O
∙HDMI™
Connector x2
∙DisplayPort x1
∙USB Type-C Port x1
∙Headphone Jack x1
View Angles 178°(H) , 178°(V)
DCI-P3*/ sRGB 91% / 114%
Surface Treatment Anti-glare
Display Colors 1.07B (8 bits + FRC)
Monitor Power Options 19V 4.74A
External Power Supply Model: YJS090G-1904740D
Power Input 100~240Vac, 50~60Hz, 1.5A
Power Output 19V 4.74A
Adjustment (Tilt) -5° ~ 20°
Kensington Lock Yes
VESA Mounting
∙Plate Type: 100 x 100 mm
∙Screw Type: M4 x 10 mm
• Thread Diameter: 4 mm
• Thread Pitch: 0.7 mm
• Thread Length: 10 mm