NVIDIA’s Ada Lovelace flagship is set to launch next month with a price tag of $1,499. The GeForce RTX 4090 is a massive triple-slot card with a TGP of 450W. The power draw is the same as its predecessor, athough we should see higher values on AIB cards. NVIDIA recommends an 850W power supply (at the least) for the RTX 4090, and quite frankly, I doubt that’ll cut it if you’re using a top-of-the-line Ryzen 9 or Core i9 CPU.
Even with the RTX 3080 Ti and 3090, I’ve experienced system crashes with a 1000W power supply upon increasing the GPU power slider to 120%. As such, I recommend going with a 1000W SMPS for optimal performance.
Moving onto the power cable options, you can use a single PCIe Gen 5 12-pin cable or three PCIe 8-pin power cables to power the RTX 4090. Regarding physical space, you need 12″ horizontally, 5.4″ depth-wise, and three expansion slots alongside 1.4″ below the card for the power cables.