[GeoWillWalls]

Just built my first computer (in my sig) and just wanting to see how much power draw a second 580 would be for a much higher second monitor, how much would my PSU need to be or is it just worth getting two 660's instead? Thanks in advance and my rigs in the sig =D

 

[eXXon]

Each card draws around 230w - 250w, plus around 150w for your other components (CPU, RAM, HDD, Fans...etc).
So total would be around 650w-700w (if you haven't overclocked your i5 too high).

IMHO, you'll need +800w quality PSU to be running smoothly.

As for the 660's in SLI, I hear they don't do well in multi monitor setup. If you plan on selling your 580, get a couple of 7950 for around the same price as the 660 and much better overall.

 

[GeoWillWalls]

Thanks for the reply =) In terms of 800+ would 850 be okay because I was looking and I was thinking of picking one of these up some time soon

http://www.scan.co.uk/products/850w-corsair-enthusiast-serie-cmpsu-850txv2-85-eff-80-plus-bronze-sli-crossfire-eps-12v-quiet-fan-at

Is that enough? I imagine it is....

Also in regards to two 580's vs two 660's vs two 7950's which one would give the best performance even without bad in certain setups, as I'm now planning to do a three monitor setup with the game spread across in landscape

Again thanks for any replies =)

 

[Forceman]

That's plenty of power supply. Of the choices you listed, the 7950s would be the best performers, especially overclocked, but that does depend a little on the games you play and how well they scale with Crossfire vs SLI. For Eyefinity resolutions the extra VRAM of the 7950s would be nice also. I think most reviewers find the SLI experience to be better than CrossFire overall though.

 

[eXXon]

I can't recommend Corsair's TX850 simply because there are better PSU's for around the same price & cheaper, like this CM:
http://www.amazon.com/Cooler-Master-Silent-Pro-RS850-AMBAJ3-US/dp/B002RWJGC2/ref=sr_1_5?s=pc&ie=UTF8&qid=1349853572&sr=1-5

Or this Antec:
http://www.amazon.com/Antec-Current-HCG-900-BRONZE-Supply/dp/B0046L2KQ6/ref=sr_1_8?s=pc&ie=UTF8&qid=1349854412&sr=1-8&keywords=antec

Or this Capstone 750 ( it can handle it

):
http://www.amazon.com/Rosewill-CAPSTONE-Certified-ATX12V-CAPSTONE-750-M/dp/B0081XXIRA/ref=sr_1_4?s=pc&ie=UTF8&qid=1349853811&sr=1-4&keywords=capstone

Or one of these Thermaltake's:
http://www.amazon.com/Thermaltake-80PLUS-Certified-Continuous-SP-850M/dp/B007BDJ58C/ref=sr_1_24?s=pc&ie=UTF8&qid=1349854734&sr=1-24&keywords=thermaltake
http://www.amazon.com/Thermaltake-Power-Supply-240-Pin-TR-800P/dp/B003O520JC/ref=sr_1_16?s=pc&ie=UTF8&qid=1349854734&sr=1-16&keywords=thermaltake

Please dont think I dont like Corsair (I own 3 of thier PSU's)..I do. But for your budget & needs, there are simply better choices.

The 7950s are best bang for your buck right now. But Since you have a 580 already, I would get another one for around 200-250$ and wait a few months until the next gen of cards is out.