Making my PSU sweat

[CLXIV]

I don't think I'll buy a 5080 but I was pondering it... I was wondering what people's thoughts are considering my PSU and what other hardware it's running:

PCPartPicker Part List

CPU: Intel Core i9-12900K 3.2 GHz 16-Core Processor (£328.50 @ NeoComputers)
CPU Cooler: Thermalright Peerless Assassin 120 SE 66.17 CFM CPU Cooler
Motherboard: MSI PRO Z790-A WIFI ATX LGA1700 Motherboard
Memory: Corsair Vengeance 32 GB (2 x 16 GB) DDR5-6400 CL32 Memory (£102.99 @ Amazon UK)
Storage: Crucial BX300 480 GB 2.5" Solid State Drive
Storage: Western Digital Black SN850 1 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive (£120.99 @ SanDisk)
Storage: Western Digital WD_BLACK SN7100 2 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive (£116.99 @ Ebuyer)
Case: Lian Li O11D XL-A ATX Full Tower Case
Power Supply: be quiet! Dark Power 12 750 W 80+ Titanium Certified Fully Modular ATX Power Supply
Case Fan: Scythe Slipstream 110.31 CFM 120 mm Fan
Case Fan: Noctua P12 redux-1700 PWM 70.75 CFM 120 mm Fan (£12.95 @ Amazon UK)
Case Fan: Noctua P12 redux-1700 PWM 70.75 CFM 120 mm Fan (£12.95 @ Amazon UK)
Case Fan: Noctua P12 redux-1700 PWM 70.75 CFM 120 mm Fan (£12.95 @ Amazon UK)
Case Fan: ARCTIC P14 72.8 CFM 140 mm Fan (£10.94 @ Overclockers.co.uk)
Case Fan: ARCTIC P14 72.8 CFM 140 mm Fan (£10.94 @ Overclockers.co.uk)
Total: £730.20
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2025-02-28 19:57 GMT+0000

360w TDP takes me up to 772w total for the system. A little higher than my 750w PSU but not by much. I wouldn't change the PSU because it's a really good one and it wasn't cheap.

And 772w is assuming every single component is going full pelt maxed out simultaneously. Which is unlikely to ever be the case. If it did overload my PSU I'd expect maybe some shutdowns, reboots, things like that under extreme load. Then possibly I look at reducing power limits on the CPU, maybe just 20w lower if that's possible and if it wouldn't incur a significant loss of performance.

Interested what people think.

 

[Vayra86]

You will need to upgrade that PSU to at least 850W.

The 5080 can and will have spikes that may simply be too much for 750W especially given the also rather bursty Intel 12900K. So an alternative to a better PSU, and perhaps temporary / tryout fix is to curb both the CPU and GPU; lowered power target for the GPU, and CPU clock/voltage limited so you arrive at peak system power of, say, 700W. The PSU can absorb a spike higher than that, and your peak power is still leaving some headroom. This provides a pretty worry-free setup imho.

 

[CLXIV]

Yeah you're probably right. It's nuts how hungry CPUs and GPUs have become. I remember 300w on a 5970 being a huge deal and that thing had 2x GPUs on it. Well I will probably stick with what I have anyway until the RTX6000s come around but appreciate the input.

 

[ir_cow]

There is no way a 750w ATX 2.3 will handle at 5080. Probably just trip the OCP instead of catching fire....

 

[N/A]

Peak power (W) 850
Form factor Version 2.52
+12V1 (A) 25
+12V2 (A) 25
+12V3 (A) 30
+12V4 (A) 30

isn't the GPU balanced V3,V4 30A+30A, the CPU is hardly more than 200W, +360W you are looking at 560 at titanium efficiency.
almost noiseless, which is more important.