GPU problem 2x 280x (PLEASE help)

[DarkMiningBTC]

So I setup my rig last night and optimized my GPU's (2x identicle 280x XFX DD). The case is MAX cooled with a huge box fan and 4 200MM fans , it's just very cools mostly running 75 C. But the problem is GPU 0 runs way lower HASH's than GPU 1. Gpu 0 runs 550KH/s and GPU 1 runs 750 KH/s. I checked msi afterburner and it states that GPU 0 usage is not stable , it goes from 100 to 60% constantly. It's not a dummy plug problem because I've tested this, switching cables between GPU's. What happens is when I set -g 2 in my cgminer config the unstabability happens. When -g 1 is enabled , it's perfectlly stable but it runs much lower hash's. I've been trying to fix it for over 30 HOURS. please help me. Anyone know whats wrong, and do you guys have a good cgminer settings for 280x's?

[DarkMiningBTC]

Ahh did I place this in the wrong section? Can anyone move it?

[24Kilo]

Can you post the setting in your conf. file or batch file? That would help.

[Oldminer]

Check the PCI-E slot speed setting in the BIOS.

[DarkMiningBTC]

Check the PCI-E slot speed setting in the BIOS.

I'm using a gigabyte motherboard, I can't find it in the bios.

[DarkMiningBTC]

I found out the problem when the temperature reaches 80+ this happens. What can I do to stop this? I already have a 200 MM fan ontop and a box fan on the side GPU 1 is at 75  C and gpu 2 behind it is at 80C.