Which PSU? Is 850W Enough?

Associate
Joined
4 Nov 2010
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377
I’m currently looking at a new build.
Motherboard, PSU and Memory is now alien to me 12 years later.
Currently i7 2600k and Vega 56 build.

I’m thinking of a 5900x and a 3080 or up card.
I was looking at 850W and hoped this would be sufficient to future proof. I will only ever run one Graphics Card, but may opt for the 3080Ti (can’t be bothered changing thermal pads on 3090)

What would be a decent PSU that will last? I was looking at the RM850 and RM850x, but seen so many threads with the RM850 and white smoke worries me. I dont want a house fire if I leave the PC on with a bit of mining if on holiday.

please share your recommendations below. Thanks in advance
 
Soldato
Joined
29 May 2005
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4,928
850w is more than enough for 3080 and 5800X

get a decent brand like Corsair/Seasonic/Phanteks (Seasonic OEM)/MSI (Seasonic OEM).

google PSU tier list and pick on the top tier 850W you will be safe as house.
 
Associate
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Leeds
850w is more than enough for 3080 and 5800X

get a decent brand like Corsair/Seasonic/Phanteks (Seasonic OEM)/MSI (Seasonic OEM).

google PSU tier list and pick on the top tier 850W you will be safe as house.

Totally correct imho , nothing else to add.
 
Associate
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Cambridge
850W is plenty. I would be more concerned with spikes, which are the main issue with 3000 series RTX.
An EVGA 750W was pushing fine my Ryzen 3900x + RTX 3090, no overclock but load of fans and watercooling gear. No issues, but the fan from that PSU was annoying.
Replaced with a Corsair RM1000, and was bad. Coil whine, replacement same issue.
Went with the Seasonic 850 Platinum and was night and day.
At the moment downsized the GPU, but the Seasonic is more than enough, if I can recommend that.
 
Associate
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RM850X 2018 model happily powering an overclocked 10700k and 3090fe.

Never had an issue. Keep thinking about going to a 1000-1200w PSU but the 850w does the business.
 
Associate
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5 Jul 2007
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506
For reference..... Just used a power meter on my sons PC while he was gaming, 332W (double that for a power supply so it runs close to its 50% sweet spot). It's a 6 core Intel, 12gb ram, ssd, HD sound blaster, DVD writer and 1080ti video. He'll be getting a new 850w Seasonic PrimeTX Titanium soon to replace his old corsair gold 1000W (from another PC, obviously over powered). The Seasonic has a 12 year guarantee and much better than average build and output quality.
 
Associate
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Location
Cambridge
My 3090 + 3900x and loads of fans and watercooling stuff, was under 500W, only on benchmarks, as never managed to load the system that much in real life. Spikes on actual GPUs is what may cause the PSU to struggle.
Seasonic is fantastic. Despite being a main manufacturer, never used before, but now I'll be using only them. Using the Focus 850 Platinum. Superb, and not a pinch of coil whine.
 
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