NVIDIA · Upgrade guide
Will the GeForce RTX 3090 fit and work in your PC?
Everything you need before you buy a GeForce RTX 3090 as an upgrade: the power supply, the power connector, whether it fits your case, and which CPUs won't hold it back.
Check it against your exact PC →🔌 Power & connectors
NVIDIA/AMD recommend at least a 750 W power supply for the GeForce RTX 3090, and it draws power through 2× 8-pin → 12-pin. Make sure your PSU actually has that cable free — it's the #1 reason a GPU upgrade gets returned.
📏 Will it fit your case?
The GeForce RTX 3090 is 313 mm long and 3 slots thick. It fits 63 of 66 popular cases we track, including 7 small-form-factor (ITX) cases.
Tightest cases it still fits: Lian Li A4-H2O (ITX), Lian Li Q58 (ITX), Fractal Terra (ITX), Fractal Ridge (ITX).
🧠 CPUs that won't bottleneck it
The faster the GPU, the more CPU you need — and lower resolutions lean harder on the CPU. Minimum recommended CPU for the GeForce RTX 3090 by resolution:
"Won't bottleneck" means your CPU can keep the GeForce RTX 3090 busy at that resolution; the chips shown are the most affordable that qualify. Specific games still vary.
Does the GeForce RTX 3090 fit your build?
Enter your case, PSU, CPU and motherboard and get an instant fit / power / bottleneck verdict for your existing PC — no parts list to build.
Run the check →