I'm upgrading my graphics capability. I'm not too impressed with DX11 so far, (certainly not impressed with the price of the cards), so I'll be buying another XFX 4770 and running it SLI with my other 4770, so the setup will be:
500W could be enough depending on the total wattage it can supply on the +12V rails. Give us the brand and ideally a link to it, and I'll see if it would be good enough after finding the max draw of each 4770. I think it might be enough.
If you have a budget, A good quality corsair or OCZ 600W power supply should be enough.
As garygole85 said though, futureproofing with the powersupply does work. about 4 years back, my friend bought a good 600W when it was the high end. Right now he still uses it and it's enough for any upgrades or new systems he'll make.
I have the ATI Radeon HD 4770 video card. It is is a very good general purpose card that is well suited for mainstream use. It just happens that two 4770's in Crossfire mode work well for gaming. The 4770 is not a stellar gaming card but does perform reasonably well in Crossfire mode.
The 4770's are energy efficient cards that do not require a lot of power. Here are the official ATI power recommendations for the 4770 video card:
450 Watt or greater power supply with two, 75 watt, 6-pin, PCI Express® power connectors recommended
550 Watt or greater power supply with four, 75 watt, 6-pin PCI Express® power connectors for ATI CrossFireXTM technology in dual mode.
The recommendations are for an entire pc system.
Corsair and Seasonic are two brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty. Lately we've been seeing a few other brands offering some high quality units. One example would be the Antec Earthwatts and the Antec TruePower New models which are a major improvement over Antec’s older psu’s like the Basiq models.
Thanks for the replies.
@garygole: Aye that's a beast, bit out of my league budgetwise though.
@enzo: I currently have a Coolermaster 500W iGreen Power. Even if it is powerful enough it only has 1 6 pin PCI-e lead. I know you can get adaptors but I heard this is an inferior way of supplying power to a card. Am I wrong? Also, I'm gonna be overclocking at some point.
@Johnny: The Antec Earthwatts Truepower 850 looks nice, found it for £96. Unless there are any more suggestions I'll be going with either that or the XFX 850W 'Black Edition' for £114 which has had good reviews.
Although it is an older model it should perform well. I took at look at other power supplies at the vendor's web site. The vendor did not have the Truepower New models. The only two brand names I recognized were Antec and Aopen. I guess the other brands are country or region specific.