Help with PCI-E 2.0 lanes

mouiylus

Honorable
Aug 15, 2013
19
0
10,510
Hi! Im looking to buy a new motherboard and since i already have a decent AMD processor: Phenom II x6 1090t I decided to stick to it instead of purchasing any Intel products. Since I'm trying to save as much money as possible I have been looking at some <100€ motherboards. The one I currently have my eyes on is the GA-990XA-UD3: http://www.gigabyte.com/products/product-page.aspx?pid=3901#sp
My preoblem is though that it only supports PCI-E 2.0 slots (1@ 16x and one other at 16x (8x mode)) since these are 2.0 slots I'm thinking they will lose alot of bandwidth. I have 2 HD Radeon 6870 graphics cards in crossfire and I wish to move them to this motherboard. How much performance will I lose with a 2.0 8x slot. Lastly, do you have any other ideas what kind of a motherboard I should be looking for? Thank you.