i have amd fx 8120 cpu,
wd caviar blue 500gb hdd,
m5a97 r 2.0 mb,
and all in one dvd rewriter,
and a cooler master gx 650 watts.
my mobo has 2 pci express slots.one at the speed of 16.amd another at the speed of 4. i wanna buy nvidia graphic cards and run them in sli.in some reviews i herd that it dosent support sli. can i decrease first slot speed to 4 or 2nd slot speed to 16.
If you want dual graphic cards, you'll need to use two AMD GPUs. Given that the second slot is only x4, I wouldn't recommend going with a dual card setup. If you want to use NVidia cards in SLI, then you will need a different motherboard; with which you can make sure the two PCI-Ex16 slots will run at x8/x8 or x16/x16.
Personally, I'd just recommend staying with a single card solution, like the GTX 670 or HD7870 (depending on budget and power supply).