R9 280x hash rates low in PCI 0

edited January 2014 in General

I have 2 R9 280xs running about 1.35-1.5 MH/s, they are plugged into PCI 0 and PCI 1 on the motherboard. For whatever reason the card in PCI 0 (doesn't matter which, I have an ASUS and a Gigabyte) runs around 600-610 tops while card in PCI 1 tops out at a healthy 750. Ideas anyone?

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