CF r9 290x on XFX 850W XXX

[DaveZjaVu]

Hi I want to crossfire two r9 290x's (cheap atm on eBay) for 4k gaming and was wondering if this psu http://www.amazon.co.uk/XFX-Edition-Modular-Certified-P1850XXXB9/dp/B008O50WG0 would be up to the task.

I already own this psu and bought a hwile back in hopes to crossfire my hd 7970 ghz edition, but I need moar powa! My cpu is a 4670k.

 

[Deleted member 217926]

No. Those things are power hogs. You want 1000 watts minimum.

http://www.realhardtechx.com/index_archivos/Page362.htm

 

[TStahler]

XFX makes an awesome power supply and 850w is more than enough power. If you overclock your processor or graphics cards heavily, then you might need more power at that point, but you should be just fine with what you have.

Cheers!

 

[DaveZjaVu]

Ok thank you, although 850w may suffice I wouldn't feel comfortable running two 290x's.

Well cheers for your answers!

 

[smeezekitty]

The GPUs will take about 600W on +12

So that is cutting it a little close but it should be alright.

I would be leary about buying them cheap on ebay

 

[DaveZjaVu]

Ok, would you reccomend twin gtx 970's instead? They'd be £200 more for two of them but I wouldn't need a new psu.

Only thing is, the r9 290x's are still better at 4k.

 

[smeezekitty]

Ok, would you reccomend twin gtx 970's instead? They'd be £200 more for two of them but I wouldn't need a new psu.

Only thing is, the r9 290x's are still better at 4k.

The 290X would probably edge out the 970s at that resolution. Not worth the extra money really.
But just make sure the ebay seller accepts returns incase they are trying to sell off broken ones

 

[Deleted member 217926]

Tom's Hardware was able to make the 290X pull 335 watts. That puts 2 cards at 670 watts by themselves. You want around 200 watts headroom over the max your entire system can pull so 1000 watts minimum.

 

[Deleted member 217926]

Yeah anything below 4k and the Sli 970s win easily. At very high resolution the 290X Crossfire wins though.

 

[DaveZjaVu]

Ok thanks. I'll wait until I have the money, but atm I'm leaning towards 2xgtx 970's with a gsync acer monitor.

Maybe driver updates can improve the gtx 970's 4k performance but then again maybe not!

 

[smeezekitty]

AMDs architecture tends to shine at high resolution. Its kind of a hardware thing

 

[Deleted member 217926]

If you don't have a 4k monitor yet wait a few months and see how the real high end Maxwell cards do. The 970 and 980 are aimed at GTX 6xx series owners and lower. The big Maxwell cards will be on the 20nm manufacturing process and will be aimed at owners of the GTX 770/780/780 Ti and Titan. Should be out early next year. That's what I'm waiting for.

 

[DaveZjaVu]

Yeah, I can't wait for 20nm cards from both Amd and Nvidia. Currently rolling with a hd 7970 ghz on 1080p. It's hanging on in there just about.