So I brought 2x Sapphire Vapore-X R9 280X video card. I am only doing 550kh/s each while on my other more powerful setup with the same card get about 750kh/s. I am wondering if the motherboard/cpu matters? Here is what I got on my new rig:
2GB DDR2 Memory
As far as my research goes, this should all be fine, but at the end, the hash rate does not lie, what am I doing wrong?