Question Should I go for an 850w PSU or 1000w PSU? (PC Build)

[Gamefreaknet]

Hi. I am currently working on a Gaming PC I'm planning to save up for however on PCPartPicker it lists the "Estimated Wattage" would be 786w thus making sense that an 850w PSU would be sufficient however should I get a 1000w PSU for extra power "clearance" (I've heard having a PSU that can just barely power your system can stress the PSU and reduce its lifespan... I'm not sure how true that is however just to be safe I guess...)

Build:

Component		Selection	Base	Promo	Shipping	Tax	Price	Where
CPU		Intel Core i9-12900K 3.2 GHz 16-Core Processor	£449.99		FREE		£449.99	Buy
CPU Cooler		Deepcool CASTLE 360EX A-RGB 69.34 CFM Liquid CPU Cooler	£97.66		FREE		£97.66	Buy
Thermal Compound		Thermal Grizzly Kryonaut 1 g Thermal Paste	£6.39			£6.39	Buy
Motherboard		MSI MPG Z690 EDGE WIFI ATX LGA1700 Motherboard	£262.79		FREE		£262.79	Buy
Memory		Kingston FURY Beast RGB 64 GB (2 x 32 GB) DDR5-5200 CL40 Memory	£290.16		FREE		£290.16	Buy
Storage		ADATA XPG GAMMIX S50 Lite 2 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive	£169.08		FREE		£169.08	Buy
Storage		Kingston NV2 500 GB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive	£42.13		FREE		£42.13	Buy
Video Card		MSI GeForce RTX 3080 RTX 3080 SUPRIM X 10G GeForce RTX 3080 10GB 10 GB Video Card	£959.99		FREE		£959.99	Buy
Case		Corsair iCUE 465X RGB ATX Mid Tower Case	£139.99			£139.99	Buy
Power Supply		Gigabyte P1000GM 1000 W 80+ Gold Certified Fully Modular ATX Power Supply	£109.99		FREE		£109.99	Buy
Operating System		Microsoft Windows 11 Home Retail - Download 64-bit	£111.36		FREE		£111.36	Buy
Sound Card		Creative Labs Sound Blaster Z SE 24-bit 192 kHz Sound Card	£66.30			£66.30	Buy
Wired Network Adapter		Asus XG-C100C 10 Gb/s Ethernet PCIe x4 Network Adapter	£94.99		FREE		£94.99	Buy
Monitor		ViewSonic VX2718-2KPC-MHD 27.0" 2560 x 1440 165 Hz Curved Monitor	£179.99		FREE		£179.99	Buy
Total:	£2980.81

 

[lvt]

1000w is more future proof.

 

[Nighthawk117]

At least 1000W or more. The issue is transient spikes, the 3080 may be 320W but for a fraction of a second it might spike to 550W. If your running a heavy load on the CPU and GPU at the same time you could trip the over current protection on the 850W.

 

[lvt]

You should consider the fact that the PSU (~10y) will last much longer than the GPU (~5y) and PSU is the less affected part by tech revolution, the only significant PSU change for the last 20y is the output power, I have a couple of 300W/350W/ 400W PSU in perfect working condition but I have to discard them because they simply don't supply enough of power for newer system.