So I've been looking into getting another Gigabyte HD6870 to crossfire with my current one and I've been looking around the net wondering what the power needs of such a setup would be, and I'm getting varying answers (between 550W-700W) for the whole system.
I currently have a board with a x16 lane and a x4 lane (sadly I missed it while I was looking over the board specs!), so would this make a difference in power consumption.
So would I have to upgrade my current PSU or can I stick with the one I have. I'm also tempted to grab a new MB with an x8 lane on it (say the Asus P8Z58V-Gen3), would this change the power needs?
i5 2500K @ 3.3GHz
8GB Ripjaws X
Gigabyte Radeon HD6870
Antec TruPower 650
120GB Corsair Micro Force Series 3 SSD
1TB WD Caviar Black
Antec 1100 Case
Windows 7 Professional 64-bit/Windows 8 Consumer Preview 64-bit