Having major problems with SLI after new motherboard installation

ponmbr

Honorable
Oct 24, 2013
5
0
10,510
So I've been having trouble with SLI ever since I had to get a new motherboard for my PC (old one stopped working after a power outage).

My current specs:
http://pcpartpicker.com/p/8PgPD3

The processor is at stock clocks currently.

I was using the Asus Z87 Plus motherboard up until it apparently got a power surge. I got the new motherboard a week and a half ago and me and my friend installed it and everything works but SLI doesn't work for me anymore. If I try to play any game with SLI enabled (I've been trying Euro Truck Simulator 2 where I used to get constant 120 FPS on nearly max settings) I get an FPS of like 10 or lower. In ETS2 I've seen it go as low as 2 FPS according to MSI Afterburner. IDK what's going on because I never had this issue before. I've tested both cards individually and both work flawlessly on their own and it works fine if I don't have SLI enabled. I did a clean install of Windows after the new motherboard was installed. The SLI bridge is securely attached (I've checked like 9001 times). I've downloaded what I thought were all the drivers I need (I have the latest drivers from Nvidia, 350.12 or whatever the latest is, and the latest chipset drivers from Asus). I really hope it's just something stupid that I've overlooked.