Which GPU Actually Drives 4K at 240Hz

A 27-inch 4K 240Hz QD-OLED sold for $699.99 in Newegg’s August feed. The panel is no longer the expensive part of this decision. The card is.

The published native 4K ultra averages fall well short of 240 fps. Tom’s Hardware’s June 2026 GPU benchmarks hierarchy puts the RTX 5090 — the fastest consumer GPU that exists — at a 110.8 fps geometric mean across eleven raster games at native 4K ultra, and 64.1 fps across its ray-traced suite, on a Ryzen 7 9800X3D testbed with no upscaling or frame generation.

240 is more than double that. For those demanding workloads, the buying question is which card feeds frame generation properly. The cable question is separate.

Choosing a GPU for 1440p at 240Hz

For 1440p, start with the games and settings you actually use. A 240Hz display has a refresh interval of about 4.17 ms (1,000 divided by 240). A card that averages 240 fps can still have slower frames, so read the frame-time results and 1% lows alongside its average. Keep generated-output FPS separate from newly rendered frames.

The Ryzen 7 7700 and RTX 5060 Ti 16GB build gives a concrete comparison: its recorded Counter-Strike 2 Very High run at 1440p reached 312 fps average and a 238 fps 1% low. Its Cyberpunk 2077 Ultra run with ray tracing off reached 78 fps average and a 62 fps 1% low. These are the existing build’s named test passes, not a new benchmark or a promise for a different processor, map or game version.

That makes the 5060 Ti 16GB a candidate for that CS2 workload; it does not make it a universal 1440p/240-fps card. For demanding games, compare the GPU hierarchy’s 1440p results and then the individual game’s test before choosing a higher tier. If an existing PC already meets the desired frame times, keep its GPU. If lower resolution barely changes the result, investigate the CPU and game behavior before assuming a larger graphics card will deliver 240 fps.

Check the complete display connection

Start here, because it is the part people spend money on unnecessarily.

4K at 240Hz is a lot of pixels per second. Run it through our DisplayPort and HDMI bandwidth calculator, which derives timing from VESA CVT reduced-blanking v2, and 3840×2160 at 240Hz clocks 2.29 billion pixels per second — about 15% above the raw active-pixel count, because blanking overhead grows with refresh rate rather than staying a flat share.

Now the links, at their effective rates after encoding overhead:

For this calculated timing, DisplayPort UHBR20 is the only listed link that carries 4K 240Hz uncompressed at 10-bit. The other rows marked “Needs DSC” require supported compression at both ends. HDMI 2.0 is the explicit exception: its TMDS path does not acquire DSC support by changing a setting or cable. Confirm the GPU output and monitor’s supported timing together; an interface version alone does not establish that the combination accepts this mode.

The vendors say the same thing in their own specifications. NVIDIA’s RTX 4090 page — a DisplayPort 1.4a card, two generations old — lists a maximum of “4K at 240Hz or 8K at 60Hz with DSC, HDR”. NVIDIA’s RTX 5090 and RTX 5080 pages both list DisplayPort 2.1b with UHBR20 and a maximum of “4K at 480Hz or 8K at 165Hz with DSC” — note that even the newest, widest link on the market reaches its headline number with compression on.

And the monitors agree. Tom’s Hardware’s Alienware AW2725Q review lists the panel as 3840×2160 at 240 Hz, 10-bit, with a single “1x DisplayPort 1.4 w/DSC” and two HDMI 2.1 ports. That is a shipping 4K 240Hz 10-bit monitor whose only DisplayPort input is the old standard.

Check the exact output and monitor before replacing a GPU for its port. The cited RTX 4090 and AW2725Q specifications establish supported examples, not a promise for every device labelled DisplayPort 1.4.

What DSC actually costs you, which is the part everyone skips

DSC is not free, but the cost is not where buyers expect.

On image quality, VESA publishes DSC as a fixed 8 bits-per-pixel target — “3:1 (8 bpp)” at 24-bit color and “3.75:1 (8 bpp)” at 30-bit — with “visually lossless compression performance verified by subjective testing”. That is a codec-quality claim under the cited testing, not a guarantee that every display mode or feature combination works.

The cost is behavioural. Reviewing a 27-inch 4K 240Hz panel with a full-speed DisplayPort 2.1 input, TFTCentral’s Simon Baker listed what UHBR20 lets you avoid in his January 2025 ROG Swift PG27UCDM review: “long delays and black screens when Alt-tabbing out of games, limitations when using multiple displays and daisy chaining, and missing support for features like NVIDIA DSR and DLDSR.”

That last one has a precise rule behind it. NVIDIA told TFTCentral, in a statement Tom’s Hardware reported, that “NVIDIA DSR, NVIDIA DLDSR, and NVIDIA Image Scaling are supported when DSC mode is enabled if the pixel rate needed to drive the display mode does not exceed the GPU’s single head limit. If GPU uses two or more internal heads to drive the display, NVIDIA DSR, NVIDIA DLDSR, and NVIDIA Image Scaling are not supported.” So DSC does not disable downsampling by itself — a mode heavy enough to consume two display heads does.

That is the whole case for UHBR20, and it is a display-behaviour case, not a performance one. ASUS states the PG27UCDM runs “4K at 240Hz or 8K at 60Hz visuals without compression” over DisplayPort 2.1a UHBR20 at 80 Gbps. If alt-tab black screens or a daisy chain matter to you, buy the panel with UHBR20 and pair it with an RTX 50 card. If they do not, DSC is the correct answer and it always was.

One real limit: AMD does not have UHBR20 in the consumer stack. Club386’s report of AMD’s confirmed RX 9070 series specifications lists “HDMI 2.1b DP 2.1a UHBR13.5”, and Sapphire’s Nitro+ RX 9070 XT page confirms DisplayPort 2.1a. RDNA 4 drives 4K 240Hz over DSC like everything else; it cannot drive it uncompressed.

The real gate is frames, and the number to check is not the one you think

Since the link is solved, the whole decision is rendering.

The demanding titles below also fall short of 240 at the review’s 4K settings. TechSpot’s 17-game RTX 5090 suite on a 9800X3D — Steven Walton’s January 2025 review — recorded 195 fps in God of War Ragnarök, 160 fps in Delta Force and 71 fps in S.T.A.L.K.E.R. 2 at 4K.

The card’s fastest 4K numbers in that suite came from lighter titles — 212 fps in Marvel’s Spider-Man Remastered, well over 300 in War Thunder — not from the heavy end of it. The card that costs $4,829.99 does not reach 240 in those three demanding games at the tested settings.

For those workloads, Multi Frame Generation can raise the displayed rate, but the acceptable input rate depends on the game and the player. The following are the reviewers’ stated preferences. PCWorld’s Brad Chacos, relaying what his testers reported in the January 2025 RTX 5090 review he co-bylined with Adam Patrick Murray, put it plainly: “you’ll want native in-game frame rates to hit close to 50- to 60fps before turning on MFG, or the latency can start to feel a little weird.”

PC Gamer’s Dave James said the same thing about NVIDIA’s DLSS 4.5 announcement — you need “an RTX 50-series GPU capable enough of delivering at 60 fps in your chosen path-traced game” before the higher frame-gen multipliers do anything but inflate a counter.

The number that decides your purchase is therefore the input rate, not the output rate. And the input rate at 4K with DLSS Quality is not the native-4K figure — DLSS Quality renders internally at roughly 2560×1440 and upscales. Tom’s Hardware’s 1440p column is the closest published stand-in for it. Reading both columns together:

Geometric means from Tom’s Hardware’s June 2026 hierarchy — 11 raster games, 8 ray-traced, Ryzen 7 9800X3D, no upscaling. The right-hand column is my derivation, not their measurement: it uses their 1440p ray-tracing result as a proxy for the internal render rate of 4K DLSS Quality, which ignores DLSS’s own overhead and is therefore slightly optimistic.

Against a 60-fps comparison point, the cited RTX 5090, 4090, 5080 and 5070 Ti averages are above it, while the RX 9070 XT and RTX 5070 averages are below it. These are suite averages and the explicitly labelled proxy above. They do not establish a universal frame-generation threshold, a per-game minimum, or DLSS support on a Radeon card. Use the feature-specific frame-generation guidance before applying the comparison.

What each expectation actually buys

Esports and older titles, natively. Counter-Strike 2, Apex Legends, Fortnite and Marvel Rivals sit inside that eleven-game mean alongside Alan Wake II and Black Myth Wukong, which is why the mean lands at 110.8 rather than at either extreme. Some lighter workloads can make better use of the refresh ceiling, but whether the display, CPU or GPU limits a particular setup requires that game’s measurements.

AAA raster at 240. The RTX 5070 Ti’s cited 1440p raster average is 116.8 fps. That makes it worth examining for an upscaled, generated-output target, but the average does not establish the base rate in every game or prove a particular output multiplier will reach 240. Check the game’s supported generation mode and compare its actual input rate and image quality.

Path-traced AAA at 240. The hardest case, and the one the marketing is built on. PCWorld measured Cyberpunk 2077 on the RT Overdrive preset with 1.7× DLSS scaling at 4K on an RTX 5090: 71 fps without frame generation, 249 fps with DLSS 4 MFG.

NVIDIA’s own CES 2026 demo, reported by PC Gamer, showed Black Myth Wukong at 246 fps at 4K with path tracing on an RTX 5090 using 6× MFG, at 53 ms of PC latency — that one is a vendor figure from a vendor demo, not an independent measurement. Those are two named workloads with different methods. They do not establish the same result for another card or game.

The dated RTX 5080 buying comparison

$1,599.99 in the September 7, 2026 Newegg observation.

The table gives the RTX 5080 a 74.0 fps proxy and 77.4 fps native 4K raster average; the RTX 5070 Ti’s proxy is 66.2. Keep the proxy label attached. Use actual DLSS and frame-generation measurements in the desired game before turning that difference into a buying decision.

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The RTX 5070 Ti was $979.99 in the August 17, 2026 Newegg snapshot. Its 116.8 fps 1440p raster average belongs to the cited suite. That older price and the September 7 RTX 5080 observation are not simultaneous quotes, so compare current offers before calculating savings.

Price the RTX 5090 against the work it must do. The historical $4,829.99 and $1,599.99 observations differ by about threefold, while the cited suite gives the 5090 about 43% more raster and 52% more ray-traced frames. Those dated figures are not a current value ranking. Native rendering performance and 32GB of VRAM may matter more than a generated-output target.

And do not buy anything at all for the port. If you already own an RTX 40-series card, NVIDIA’s own specification page says it drives 4K at 240Hz over DisplayPort 1.4a with DSC. Buy the monitor, keep the card, and upgrade when the frame rate bothers you rather than when the spec sheet does.

Two things that would change this. If you want an uncompressed signal — because alt-tab blackouts or a daisy chain have burned you before — you need both a UHBR20 monitor and an RTX 50 card, and that combination has a price. And if ray tracing is off the table entirely, the RX 9070 XT is the value play at 65.8 fps native 4K raster, while its features and actual ray-tracing results need to be compared separately from the GeForce DLSS modes.

The cited prices are dated observations: August 17, 2026 for the RTX 5090 and RTX 5070 Ti, and September 7, 2026 for the RTX 5080. Check current seller, stock and price on the live page before ordering.

Where each card sits across every resolution: the GPU hierarchy 2026 tier list. What frame generation is doing to those numbers: frame generation explained. Whether your exact resolution, refresh and color depth fits a given cable: the DisplayPort and HDMI bandwidth calculator.