GTA 6 Low FPS on RTX 4080 Super: Settings and Driver Fix

Quick Answer

A RTX 4080 Super should hold 90-110 fps in GTA 6 at 1440p Ultra with DLSS Quality; if you are well below that the culprit is almost always an outdated GPU driver or a corrupted shader cache, not the card itself. Clean-install the latest 566.xx branch driver, delete the shader cache, and cap background apps before you touch in-game settings.

First fixes that recover the most frames

Start with the driver. A clean install (DDU in Safe Mode, then the newest 566.xx package) resolves the large majority of "sudden low fps" reports on the RTX 4080 Super. Next, delete GTA 6's shader cache so it rebuilds against the new driver, and set the game's process priority to High in Task Manager. These three steps alone typically move a stuttery RTX 4080 Super back into the 90-110 fps band at 1440p Ultra with DLSS Quality.

Settings that cost the most performance

Volumetric fog, ray-traced reflections and the highest crowd/traffic density sliders are the heaviest hitters in GTA 6. Drop ray-traced reflections one notch and cap shadows at High and the RTX 4080 Super climbs from the 70-85 fps range at 4K with frame generation into comfortable territory. Upscaling is your biggest single lever: enable it at Quality first, then Balanced only if you still need headroom.

SA-specific checks before you blame the card

On Eskom-stable power a RTX 4080 Super build will run at full clocks, but a marginal power supply or a hot enclosure in a Highveld summer can force the card to throttle. Confirm GPU temps stay under 80 C and that the PSU is sized for the whole system. A RTX 4080 Super pulls real wattage under load, so a quality 750W+ unit is the safe floor. All cards and PSUs referenced here are stocked locally at Evetech with SA warranty.

FAQ

Why did my RTX 4080 Super suddenly drop frames in GTA 6?

A driver update or a Windows update usually invalidated the shader cache. Clean-install the 566.xx driver and delete the GTA 6 shader cache folder; frames return to the 90-110 fps band at 1440p Ultra with DLSS Quality.

Do I need to lower resolution on a RTX 4080 Super?

No. The RTX 4080 Super has the raw horsepower for 1440p Ultra with DLSS Quality. Use upscaling at Quality instead of dropping native resolution, and you keep image sharpness while gaining frames.

What FPS should I realistically target?

Aim for 90-110 fps at 1440p Ultra with DLSS Quality as your everyday target. If you run 4K with frame generation expect 70-85 fps, which is still smooth with frame generation enabled.