rig: email@example.com,saphire hd 7950vapor-x(going to buy the same one),GIGABYTE GA-Z77-D3H - Intel Z77 mobo, Seasonic SS-750HT-F3 750W, OEM psu, ? mobo has only 1 pcie 3.0 and 1 2.0, would that be a problem/performance decrease? is psu ok? I googled it and found it has 740w on 12v rail, which is great, but didnt find info if it has the right pins for 2 saphire 7950 vapor-x cards.. please help
Yes you can but I advice against it since the second PCIe X16 slot runs on X4 speed which would mean performance penalty on average of 10% compared to a board with two slots at X8 X8 speed with dual cards. Your PSU works for it.
will those 2 hds run bf4 at 1080p/ultra ( maybe only 2xmsaa ) even with that slower pcie ? @60fps with vsyc on ofc, right now my 1 hd can play it at 1080hp high setting @60fps stable without problem and this upgrade comes very cheap for me + i plan adding 3770k someday next year..
thank you very much, 1 more thing, u said the 2.0 pcie is 4x only, but my description says: ....3x PCI-E x1, 2x PCI, 1x PCI-E 2.0 x16, 1x PCI-E 3.0 x16, 2x SATA 6Gb/s, 4x SATA 3Gb/s, 1x mSATA,.... , so if it is x16, the performance drop should be minimal ( ±5fps ), right ?
edit: nvm, i read full description now and it is sad 2.0 pcie runs as x4 or something, so u were right. anyway 2 7950 should be fine for bf4, i dont have my pc for epenis benchamrk scores around 200k thank you, will mark ur post as solution