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I have some 7950 and some R280, can I connect them both on one rig? Will it work normally? Or does system require all GPUs to be same?

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Nope, you're good to go. You don't even have to connect them all through PCI-e. With cgminer, you can set the settings uniquely for each card. You can use any kind of adapter that would normally bottleneck GPU performance.

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  • I've been reading about an 8 GPU limit (4 for dual cards). Any truth to this? – user12832 Jan 28 '14 at 23:53
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    I'd assume that your weakest link would be the motherboard. – mosca1337 Jan 31 '14 at 20:04
  • "You can use any kind of adapter that would normally bottleneck GPU performance" .. so using a PCIe x1 to PCIe x16 OR PCI to PCIe adapter would be ok? – farinspace Mar 29 '16 at 5:08

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