Can I use a 750W PSU for two R9 290X's?

[PCperson]

The title is fairly explanatory. I have a 750W Seasonic X-series 80+Gold PSU and I want to know it if is safe to use with two R9 290X's and a Core i7 4790K.

[Tedster]

The title is fairly explanatory. I have a 750W Seasonic X-series 80+Gold PSU and I want to know it if is safe to use with two R9 290X's and a Core i7 4790K.

I would want to throw some more power at it - at least 850 watts.

[iamdarkyoshi]

No problem. My hd7950s in crossfire with a 95w tdp CPU drew a max of 550 watts.

[MegaDave91]

Might be tight. I certainly wouldn't overclock them much.

[samcool55]

It's seasonic, go 4 it, they can handle it. It's probably possible to go over it's 750W limit without the psu complaining.

[Badger906]

a r9 295x2 with an i7 uses around 650w from the wall, so it should be ok.

[Rolling Potatoe]

It should work, but with an overclock and 100% cpu and gpu usage your gonna be around 90% psu usage.

Since its a quality psu you should be fine, but if you didnt have a psu alaready id go with 850w.

[PCperson]

No problem. My hd7950s in crossfire with a 95w tdp CPU drew a max of 550 watts.

The 7950's have a TDP of 200W and the 290X's have a TDP of 300W so if we add the two hundred extra watts then it's 750Ws  

[Matriox]

The title is fairly explanatory. I have a 750W Seasonic X-series 80+Gold PSU and I want to know it if is safe to use with two R9 290X's and a Core i7 4790K.

I've done it before on a 750w thermaltake(Bronze) psu but shortly after I upped it with a 850w Raidmax(Gold) psu. So definitely no overclocking and i'd watch out on the %100 usage for all 3 components, just in case it buckles 

[Badger906]

The 7950's have a TDP of 200W and the 290X's have a TDP of 300W so if we add the two hundred extra watts then it's 750Ws

TDP is thermal output not power draw.

[PCperson]

It should work, but with an overclock and 100% cpu and gpu usage your gonna be around 90% psu usage.

Since its a quality psu you should be fine, but if you didnt have a psu alaready id go with 850w.

 

a r9 295x2 with an i7 uses around 650w from the wall, so it should be ok.

 

Thanks! 

 

EDIT: I just did some math and the total possible power draw with all three components based on their TDP (I know it's not that accurate but still) is 688W which is 91.7% of the total amount of power my PSU can deliver, and I doubt I'll use 100% of all three just gaming, thanks for the answers everyone! I still might upgrade to at least an 800W PSU just for the safety margin, though. EDIT: I'll probably measure the power usage from the wall while all three components are at 100% (When/if I upgrade) and if it's too high I'll upgrade my PSU.

[iamdarkyoshi]

The 7950's have a TDP of 200W and the 290X's have a TDP of 300W so if we add the two hundred extra watts then it's 750Ws

Thats while running prime95 and furmark with everything overclocked as high as they can go. It will be on the high side, but honestly NOTHING draws as much as prime95 and furmark.

[Kevguy]

No, only if it were nvidia cards.

[Godlygamer23]

It's seasonic, go 4 it, they can handle it. It's probably possible to go over it's 750W limit without the psu complaining.

Complaining isn't the issue. Sustaining the requested power is the issue.

[Avalen]

It's tight. I wouldn't be comfortable with it but it could work.

[PCperson]

TDP is thermal output not power draw.

TDP is determined by the power consumption; the TDP is probably about 90-95% of the power draw of a component. EDIT: I added ten percent to what I got earlier and it is still only ~98% of the maximum output of the PSU, although... it is 98% of the PSU output. I think I'll upgrade to the 850W... how is this PSU?

 

http://www.newegg.com/Product/Product.aspx?Item=N82E16817438034&cm_re=850W_psu-_-17-438-034-_-Product