PSU is able to run a 295x2???

Reuben Speirs · Jun 4, 2015

So I have rencentally got a R9 295x2 and have also brought a 1000W PSU. Of course this is enough to run it but im worried about the amps it can provide through the 12V rails. There is a document sent with the r9 295x2 to make sure your psu will be powerful anough to run it, its saying that I need each 12V rail to be able to supply 25A to make a total of 50A + supplied to the GPU. At the moment my PSU can only provide 24A over each of the 12V rails, I want to know if this is enough or will I have to get a new PSU?

Thanks for the Help in advance.

Thineswar · Jun 4, 2015

make of psu and gpu?

sizzling · Jun 4, 2015

24A on 2 12v rails for a 1000w PSU? That does not make sense, unless this is some cheapo PSU. 48A combined is what I would expect from a 700-750w PSU? What make and model is this psu

Reuben Speirs · Jun 4, 2015

RIP miss clicked and made this solved FFS. PSU is EVGA 1000 SuperNOVA 1000G G2, GPU is R9 295x2 8GB DDR5 XFX. If I have to I may decide to sell the psu and buy another.

sizzling · Jun 4, 2015

I think you have misread the PSU spec, that PSU has 83A on a single 12v rail and is plenty good enough for your gpu

sizzling · Jun 4, 2015

83A http://www.evga.com/products/Product.aspx?pn=120-G2-1000-XR

Thineswar · Jun 4, 2015

i think you read that wrong. the psu can supply 83.3 A on the 12v rail.

can you provide your cpu model just so i know how much in total your system would draw from the psu?

photonboy · Jun 4, 2015

Hi,

I strongly recommend the GTX980Ti instead. First let's get a benchmark that actually AVERAGES performance over many games:
http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_980_Ti/31.html

While that AMD card can get higher frame rates that only works on SUPPORTED TITLES and even then many of those will have higher stutter than a single-GPU setup. It mainly wins at 4K which is generally pointless for gaming and only slightly ahead at stock settings at 2560x1440 (before overclock and MFAA).

*For games that don't support Crossfire you might get about 60% roughly the performance of the 980Ti.

There's a lot of other PROS to the NVIDIA card as well:

a) 6GB of VRAM (295x2 has 2x4GB for effective 4GB buffer not 8GB)
- in the future we MAY see DX12 titles support ADDING video memory but for now it's 6GB vs 4GB. There's already several titles that use more than 4GB and an increasing number on the way.
b) far less heat output (in my room 295x2 would be like a sauna)
c) NVidia has better driver support especially comparing AMD Crossfire to NVidia single GPU (don't flame me, what many experts are saying)
d) NVidia features like:
- MFAA
- H.265
- voxel lighting and HUD (future support)
- PhysX (for games like Batman series etc)
- 980Ti has DX12.2 feature support for UPCOMING GAMES (so will support things the AMD cards will not)

Summary:
If you haven't done your research into the pros and cons of Crossfire then I suggest you do so.

*If you look closer at the benchmark you'll see a pretty SMALL difference. I know there are several games that AMD does significantly better in (mainly at 4K) but you really want the AVERAGE performance which is why Techpowerup is so great. A different site might show a HUGE advantage to the 295x2 but only average four games.

We didn't even factor in more titles with NO support for Crossfire, account for the relatively higher OVERCLOCK of the 980Ti, or add in MFAA for supported titles which further boosts the 980Ti's performance.

Add in the heat, PhysX, other features etc and it's really hard to justify going with the AMD card!

Reuben Speirs · Jun 4, 2015

sizzling :

O wow im an idiot I misread, thanks for pointing it out....

Would give you best solution my accidentally miss clicked it away

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