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MONITORS

MSI MAG 321UPX QD-OLED

31.5-inch · 3840 × 2160 · 240 Hz

Screen diagonal
31.5 in
Native resolution
3840 × 2160
Refresh rate
240 Hz

A 31.5-inch 3840 × 2160 QD-OLED monitor running up to 240 Hz on every input, with a 0.03 ms GtG response rating, DisplayHDR True Black 400 and USB-C display input with 15 W charging.

Prices & buying options

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Price history · US
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Item price · same listing and exact model

Latest check$75.00
Lowest shown$75.00

20 observed days · 28 Sept–17 Oct

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$75.0017 Oct, 12:04 UTC

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THE ACTUAL PRODUCT
MSI MAG 321UPX QD-OLED monitor on its supplied stand, official front view with manufacturer sample screen artwork
Official product image · Image source detailsProduct imagery does not establish a retailer’s bundle or condition.
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Specifications checked 21 Sept 2026Manufacturer specifications, not a hands-on test.

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The useful part.

Key strengths

4K at 240 Hz over DisplayPort, HDMI 2.1 or USB-C, a 0.03 ms GtG response rating and 99% DCI-P3 (CIE 1976), with a 3-year warranty that covers panel burn-in.

The checks that matter.

Before you buy

USB-C charging is limited to 15 W, PIP/PBP isn't available, there are no USB-A hub ports, and the stand's ±10° rotation is not a portrait pivot.

Every specification. With its source.

Full specifications

Exact configuration: 31.5-inch · 3840 × 2160 · 240 Hz · MSI global specification

51 specifications in 10 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”. 1 row repeats a listed fact in the manufacturer’s own wording, kept under “Manufacturer wording”.

Screen & panel

8 items
Screen diagonal
31.5 in

Manufacturer panel diagonal; rounded size printed on marketing imagery may differ.

Source
Native resolution
3840 × 2160Source
Panel technology
QD-OLEDSource
Aspect ratio
16:9Source
Screen shape
FlatSource
Screen surface
Anti-reflectionSource
Pixel pitch
0.1814 × 0.1814 mmSource
Declared viewing angles
178° horizontal / 178° verticalSource

Refresh & response

8 items
Refresh rate
240 Hz

DisplayPort: up to 240 Hz; HDMI: up to 240 Hz; USB-C DisplayPort Alt Mode: up to 240 Hz, at native 3840 × 2160 resolution. Source, cable and selected mode must support the signal.

Source
Adaptive sync
Yes

Check that your graphics card or console, input and mode support the listed technology.

Source
Listed sync technology
Adaptive-Sync

Requires a compatible source, port, driver and mode.

Source
Declared adaptive-sync range
48–240 Hz

Activated range per the datasheet. The separate Signal Frequency row lists 48~360 Hz vertical, which is not a documented 4K refresh or VRR range.

Source
Native-resolution input limits
HDMI, DisplayPort and USB-C: 3840 × 2160 up to 240 Hz

Compatible source, cable and mode support required.

Source
Maximum HDMI refresh at native resolution
240 Hz

Compatible source and cable required.

Source
Maximum USB-C refresh at native resolution
240 Hz

USB-C DisplayPort Alt Mode; compatible source and cable required.

Source
Declared GtG response
0.03 ms

The feature text describes this as 'up to 0.03 ms GtG', a best-case manufacturer figure, not an average or input lag.

Source
Manufacturer wording (1)

The same facts in the manufacturer’s combined or original wording, each with its source.

Response method and claim
0.03 ms GtG

GtG, MPRT and input lag measure different things.

Source

Colour, brightness & HDR

8 items
Declared brightness
250 cd/m²

Typical SDR brightness; not an HDR peak figure.

Source
Static contrast claim
1500000:1Source
Colour depth
10-bitSource
HDR support
DisplayHDR True Black 400Source
Declared sRGB gamut
138.2% (CIE 1976)

Figures above 100% describe colour volume, not coverage.

Source
Declared DCI-P3 gamut
99% (CIE 1976)Source
Declared Adobe RGB gamut
97.5%

The datasheet note states the CIE1976 basis only for sRGB and DCI-P3; the Adobe RGB reference is not stated.

Source
Displayable colours
1.07 billionSource

Inputs & connections

8 items
USB-C connection
YesSource
Inputs and versions
1 × DisplayPort 1.4a; 2 × HDMI 2.1; 1 × USB-C with DisplayPort Alt Mode and up to 15 W Power Delivery; headphone output

DisplayPort: up to 240 Hz; HDMI: up to 240 Hz; USB-C DisplayPort Alt Mode: up to 240 Hz, at native 3840 × 2160 resolution. Source, cable and selected mode must support the signal.

Source
USB-C charging
15 W

Maximum charging output, not the monitor’s power consumption. Compatible device and cable required.

Source
Picture-in-picture / picture-by-picture
No

MSI lists PIP / PBP as N/A.

Source
HDMI version
2.1Source
DisplayPort version
1.4aSource
USB-C display input
Yes

Source port and cable must support DisplayPort Alt Mode.

Source
USB hub
No

No USB Type-A or Type-B ports appear in the datasheet's port rows or its numbered connections list; the USB-C port is listed for DisplayPort Alt Mode and 15 W charging.

Source

Stand & mounting

8 items
Height-adjustable stand
Yes

The supplied stand has a published height adjustment range of 0–100 mm. This is travel, not the assembled monitor height.

Source
VESA mounting pattern
100 × 100 mmSource
Stand height travel
100 mm

Adjustment travel, separate from assembled monitor height.

Source
Stand adjustment
Tilt −5° to +15°; height travel 100 mm; swivel supported; screen rotation ±10° (MSI's 'pivot' figure — not a 90° portrait pivot)

MSI's datasheet prints the swivel range as “30° ~ 30°” (no minus sign), so the exact swivel range isn't confirmed.

Source
Stand tilt
−5° to 15°Source
Swivel-adjustable stand
Yes

MSI's datasheet prints the swivel range as “30° ~ 30°” (no minus sign), so the exact range isn't confirmed.

Source
Portrait pivot
No

The stand lists a −10° to 10° rotation adjustment, not a 90° portrait pivot.

Source
Kensington lock slot
YesSource

Size, weight & build

6 items
Dimensions with stand
717 × 477 × 242 mm (width × height × depth, with stand)

Manufacturer dimensions with stand, shown width × height × depth. Stand depth is not panel thickness and excludes additional cable clearance.

Source
Stand depth
242 mm

Manufacturer dimensions with stand, shown width × height × depth. Stand depth is not panel thickness and excludes additional cable clearance.

Source
Dimensions without stand
717 × 419 × 72 mm (width × height × depth)Source
Active display area
699.48 × 394.73 mm (horizontal × vertical)Source
Net weight
9.1 kg

Manufacturer net weight; the datasheet does not state whether the stand is included.

Source
Gross shipping weight
11.4 kgSource

Power & energy

1 item
AC input
100–240 V, 50/60 Hz

Power type is listed only as 'Power Cable'; the connections list an AC input. Supply-input range, not operating power consumption.

Source

Eye care & features

2 items
OLED maintenance features
OLED Care 2.0

MSI does not itemise the individual care functions.

Source
Panel cooling
Fanless (graphene film with custom heatsink)Source

Audio

1 item
Headphone output
YesSource

Box, warranty & identity

1 item
Manufacturer warranty
3 years, including panel burn-in

Regional terms and exclusions apply.

Source
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