3x 7970 Power Supply

Hardware Hub PSU
1

I went a little crazy last night and was talking to my friends I usually play Battlefield with and I offered to buy one of their MSI 7970's off of him to help him pay for college books. I already have two HIS 7970's in my rig. I'm an AMD guy so I was just wondering if my psu could handle the extra juice needed to drive these cards.

I have a fx 8350 at 4.7Ghz processor cooled by a custom water cooling loop.

Two hard drives in RAID 0

9 led fans(radiator fans included)

An Asus Xonar STX soundcard

And to power this I have a Cooler Master 1000watt silent pro gold.

Am I safe to run this third card or do I need a PSU upgrade?

 

2

You'd need an upgrade I'd wager. 1200W Would be perfect most likely. 1500W to be on the safe side

 

3

It should be ok with your PSU; Your cpu won't be able to feed fast enough the 3rd card fully. But its highly depended on application/game.

Note, there's extra draw per each card on top of gpu power draw. (should be within 50Watts / GPU) for being stable. You don't seem to have a lot of hardware there but it would be desired to get 1200 if your cooling systems are drawing a lot of it.

4

I think 1000 watts should be fine, no way you will max out CPU and 3 GPUs in any game, even then 1000 watt should be ok.

5

You could probably run that on a decent 850W unit. 1000W would be preferable. Though, three 7970 GPUs will be bottlenecked by the lack of bandwidth.

6

damm triple crosfire on a FX8350, the scaling will sucks ass.

7

Yeah, everything above two way crossfire is crazy. But many people like crazy things :D

8

Thanks for all the help. I'm waiting to get more money to maybe switch to x99 platform so the scaling won't be so bad. If in fact my psu can't handle three cards I might use a second psu with that add2psu switch thing just to power the third card.

9

Sounds good to me.

10

1k wats seems fine .

People don't seem to understand how mutch 1000w is ...

But just make sure you set the power limit to 100% , and don't oc the gpu's , and deactivate amd overdrive , there is no need if you have 3 for one 1080p display xD

11

I will probably end ocing the shiz out of all three cards just for fun. I game at 5760x1080 so 3 cards isn't a total waste, plus people freak out when I show them my rig.

12

http://www.tomshardware.com/reviews/amd-r9-295x2-1000w-psu,3907.html#xtor=RSS-998 1000 watts are enough for 2 295x2 :D