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Topic: 7970 on slot 1 getting less MH/s any ideas? - page 2. (Read 3268 times)

hero member
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I just started screwing around with a 7970 rig. I have three of them in a windows 7 pro 64 bit rig.

Specs

Asus p8p67 WS revolution mobo
1 gig ram ddr3 1333
old laptop HD
low wattage sandy bridge cpu 45 watt

1st 7970 in pci slot 1 on mobo
2 7970 with pci x16 extenders
750 watt seasonic gold psu

So any idea why the first cards get 496 mh/s ? - stock gpu clock 925, 775 mem - for burn in
other 2 cards get 550 mh/s at 925/775

Using cgminer 2.7.4 with no tweaks, just letting it run on auto pilot for now.

Thanks for any help.
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