Planning on upgrading to a 4090 with already built system

[Kaim]

I have an already built system, and looking to upgrade to the 4090 because I promised my brother that I would give him my 3080 12gb once the new cards are released. My question is, my current PSU is a 850, which is a minimum spec for the 4090. Would I need to change it? The PCpartpicker calculator says I should be fine, but I'm looking for a human to confirm it. My current system specs are below.

 

CPU: Intel Core i7-12700KF 3.6 GHz 12-Core Processor
CPU Cooler: Corsair iCUE H150i ELITE LCD 58.1 CFM Liquid CPU Cooler
Motherboard: Asus ROG STRIX Z690-F GAMING WIFI ATX LGA1700 Motherboard
Memory: Corsair Dominator Platinum RGB 32 GB (2 x 16 GB) DDR5-5200 CL40 Memory
Storage: Samsung 860 Evo 1 TB 2.5" Solid State Drive
Storage: ADATA XPG SX8200 Pro 1 TB M.2-2280 PCIe 3.0 X4 NVME Solid State Drive
Storage: Samsung 970 Evo Plus 1 TB M.2-2280 PCIe 3.0 X4 NVME Solid State Drive
Storage: Western Digital Black SN750 1 TB M.2-2280 PCIe 3.0 X4 NVME Solid State Drive
Storage: Micron 1100 2 TB 2.5" Solid State Drive
Storage: Western Digital Black SN850 2 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive
Video Card: EVGA FTW3 ULTRA GAMING GeForce RTX 3080 12GB LHR 12 GB Video Card
Case: Lian Li O11 Dynamic EVO ATX Mid Tower Case
Power Supply: Corsair RM850x (2021) 850 W 80+ Gold Certified Fully Modular ATX Power Supply 
Case Fan: Corsair iCUE QL120 41.8 CFM 120 mm Fans 3-Pack 
Case Fan: Corsair iCUE QL120 41.8 CFM 120 mm Fans 3-Pack 

[NelizMastr]

You're "probably fine" if you don't overclock your CPU. 

 

Also make sure to use 3 separate 8-pin PCIe leads from your PSU to the 4090. 

 

I'd probably opt for an undervolt on the 4090 anyway because the rated TGP is beyond insane and unnecessary. 

[Kaim]

Thanks, I was planning on undervolting anyway because it has worked well with my 3080.