PSU for multi-gpu

dromi · 25 Sep 2015 at 10:35

If I wanted to have two 980ti, what size PSU will I need?

I've been looking at 850 psu, would the be enough?

Thanks,
Cris

pastymuncher · 25 Sep 2015 at 19:33

850w is more than enough. This would be where my money would go:-

YOUR BASKET
1 x EVGA SuperNova G2 850W '80 Plus Gold' Modular Power Supply £114.95
Total : £124.55 (includes shipping : £8.00 Ex.VAT).

It's built by Superflower for EVGA and is basically the Leadex Gold with a different fan, no tacky led's and a whopping 10 year warranty.

colinmcr · 25 Sep 2015 at 20:40

+1 for what pastymuncher said

I've used the same PSU on dual 970 and dual 980ti no problems

dromi · 26 Sep 2015 at 00:15

Thanks guys, I Already have an old antec Quattro 850 semi mod from my previous build 6 years ago.

You think I would be ok with it, or is it advisable to go for a clean start?

Danny75 · 26 Sep 2015 at 05:57

dromi said:
Thanks guys, I Already have an old antec Quattro 850 semi mod from my previous build 6 years ago.

You think I would be ok with it, or is it advisable to go for a clean start?

Play it safe. Clean start and better PSU. 6 years is a long time. Especially if it's out of warranty, and the PSU company will then not cover any damages to the rest of the hardware if the worst were to happen.

Another vote for the G2.

whyscotty · 26 Sep 2015 at 07:57

Pairing them with which CPU?

Will you be OC'ing the CPU?

Will be OC'ing the GPU's using a custom bios?

Silent_Scone · 26 Sep 2015 at 08:32

850 to 1000w, 1300w if overclocking and using circa 1.3v+

dromi · 26 Sep 2015 at 09:18

Pairing them with which CPU?

Will you be OC'ing the CPU?

Will be OC'ing the GPU's using a custom bios?

It will be a mAtx build on a corsair 240, with either the 5820k or 5930k.
My understanding is that 5930k will be better for multi gpu.

I don't think I will be OCing anything

setter · 26 Sep 2015 at 10:03

For dual card sli the 5820k is grand. Saves you a few quid. Id only opt for a 40 lane cpu if going with 3 or more gpu's in sli.

whyscotty · 26 Sep 2015 at 17:08

dromi said:
I don't think I will be OCing anything

Free performance and all

dromi · 27 Sep 2015 at 01:40

Free performance and all

lol forgot for a second I am in the "overclockers" forum. Very rude indeed

The thruth I no very little about it, what PSU should I get if I was going to OC?

dromi · 27 Sep 2015 at 01:42

Play it safe. Clean start and better PSU. 6 years is a long time. Especially if it's out of warranty, and the PSU company will then not cover any damages to the rest of the hardware if the worst were to happen.

Another vote for the G2.

Thanks for your feedback, I think you are right. Will keep my old PSU as a backup, and will get the G2 as you suggest.

whyscotty · 27 Sep 2015 at 08:12

dromi said:
lol forgot for a second I am in the "overclockers" forum. Very rude indeed

The thruth I no very little about it, what PSU should I get if I was going to OC?

Don't worry mate, we all knew nothing at the start.

Just make a thread in the relevant section - Plenty of peeps on here to help you.

The G2 850 will serve you well, but I would get this one in case you decide to push things.(That is if you go down the SLI route)

YOUR BASKET
1 x EVGA SuperNova G2 1000W '80 Plus Gold' Modular Power Supply £134.99
Total : £144.59 (includes shipping : £8.00 Ex.VAT).

colinmcr · 29 Sep 2015 at 09:29

Based on the replies here what would you use for dual xeon on Z10 motherboard and four cards that are folding. You've got me thinking my G2 1300 is going to struggle. I want to add two cards to the two I have.

dromi · 2 Oct 2015 at 22:20

What the biggest one you could get? Is there a drawback for getting an over the top PSU?

rolypolyman · 11 Oct 2015 at 23:04

Well I like a bit extra on the side, just in case. I was gonna get the Superflower 850W Titanium but saw the 1000W for only £10 more, seemed silly not to. I know its more than I need but heyho. Don't know if there's any drawback to going bigger though. Got my rma replacement case through and decided to go fully modular.

Dalandius · 23 Oct 2015 at 14:39

dromi said:
What the biggest one you could get? Is there a drawback for getting an over the top PSU?

They cost more, also they tend to be less efficient with lower loads so it will cost more to run it. There is a interesting article at (http://www.anandtech.com/show/2624/3) about it.

Mostly unless you got well over the top with the PSU the effect is not going to be that large.

whyscotty · 23 Oct 2015 at 15:44

Dalandius said:
There is a interesting article at (http://www.anandtech.com/show/2624/3) about it.

You serious - that's from 2008 - things have changed.

smilertoo · 23 Oct 2015 at 15:46

I wouldnt trust an old Antec with shiny new 980s.

Dalandius · 23 Oct 2015 at 16:00

whyscotty said:
You serious - that's from 2008 - things have changed.

https://en.wikipedia.org/wiki/80_Plus

More upto date for you but the idea is still the same, things may have changed but not that much.