I recently upgraded my system and am experiencing an issue.
My current setup is
MSI P55-GD55 micro-ATX MOBO
Intel i5-750 CPU
Corsair 750w PSU
4G DDR3 Corsair Memory
ATI Radeon 5770 (XFX manu.) x2
The recent additions are
the Corsair PSU (750w up from a 550w)
And a second Radeon 5770
The issue I've been having is that I have noticed a loss of framerate in quite a few games when shadows quality is turned up after adding the second card. Before I even began toying around in games, I made sure they were both properly connected or working (through CCC), so I ruled that out as being the issue.
I've began thinking that it's my PSU, under-powering the cards. According to the manufacturer, the PSU puts out 60A on the +12v. My question to you guys is; Is this in fact the problem? I've done a bit of searching but can't find any concrete evidence. All I have to go on is that the game performance does increase when the second card is removed.
A buddy of mine at the office suggested I check around for issues wit this particular game and crossfire. However I had no idea about the slower speed of the second PCI-E Gen on my Mobo and that seems to be the most logical answer here.
Just to be certain, I think I'll search around for possible xfire/driver issues before looking at new mobo's T.T