R9 295x2, 290x tri-crossfire, does it work and do I have enough power

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toeachthierown

Commendable
Aug 17, 2016
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Hello, I reinstalled the 290x I had before I got my 295x2 but I can't seems to get all 3 GPUs running at once and various testing methods (games, MSI afterburner, GPU-z and 3d mark) have given me inconsistent result, sometimes utilizing only 1 or 2 cards. I believe the problem lies in that I am using a 1000W EVGA PSU (I hope it shows under my post) although I was expecting some sign other than a GPU not being utilized like freezing, slowdowns or other visible issues.

If I do indeed need a new PSU could you suggest a replacement ( Im leaning toward corsair for the Link).

P.S. OuterVision® Power Supply Calculator is calculating that my system would use 1193 W.
 
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That really doesn't sound like a PSU problem. PSU calculators tend to overestimate usage. It's difficult to pull more than 450W from a 295x2 (the cooling solution really can't handle more than that), and while it's technically possible for a 290X and the rest of the system to exceed the remaining power budget, it's pretty unlikely.

In any case, any 1000W EVGA PSU is going to have at least decent protection circuitry which should shut itself down before its power output gets degraded to the point that it would prevent a card from working at all. The symptoms you describe don't line up with a PSU issue as far as I'm concerned.

There's probably some other issue going on.
I assume you're aware that Tri-fire is generally a terrible...
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rhysiam

Splendid
Mar 24, 2013
4,366
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That really doesn't sound like a PSU problem. PSU calculators tend to overestimate usage. It's difficult to pull more than 450W from a 295x2 (the cooling solution really can't handle more than that), and while it's technically possible for a 290X and the rest of the system to exceed the remaining power budget, it's pretty unlikely.

In any case, any 1000W EVGA PSU is going to have at least decent protection circuitry which should shut itself down before its power output gets degraded to the point that it would prevent a card from working at all. The symptoms you describe don't line up with a PSU issue as far as I'm concerned.

There's probably some other issue going on.
I assume you're aware that Tri-fire is generally a terrible idea that will probably cause more performance issues than it solves over a wide variety of games? Are you sure it's worth it for you to invest the time and energy to get this working? With the current mining craze you could probably get a very good price for those cards and buy something much better for gaming.
 
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