Crossfire, Please help!!

George002000 · Sep 30, 2014

Hi there guys I've had my second graphics card in my PC now for 2 weeks and are wondering if I've got my crossfire on. I've gotten two R9 290 Tri-X Sapphire cards with a Z97-K motherboard. These cards use the AMD CrossFireX, This motherboard does support this and I can't seem to get my crossfire working. I go into the CCC (Catalyst) and go on to the "Gaming" and there isn't a CrossfireX, These cards DO NOT NEED THE CROSSFIRE BRIGE. These two GPU's are working because I switched them around and they work and in device manger there both coming up and it says "working properly" I've been able to run a monitor off the second GPU so I know it's working fine. Does anyone know what my problem is and if I need to enable crossfire in my motherboard BIOIS.

Please help
Thanks so much.

chris987 · Sep 30, 2014

go into bios and force PCIe x16_2 slot to operate at x4 mode. (default is x2) . also since it shares bandwidth with the rest of pciex1 slots , you cant have any other slot occupied!

George002000 · Oct 1, 2014

chris987 :

I done all of this and it's still not got an enable crossfire button, do you know why?

unknownofprob · Oct 1, 2014

First of all, i do not know why you decided to crossfire on that board at all, as the second slot runs at X4.

1 x PCIe 3.0/2.0 x16 (x16 mode, gray)
1 x PCIe 2.0 x16 (max at x4 mode, black) *1

X4 mode cant support Crossfire with that card, the bandwidth is too low. In other cases having a lesser powerful card in X4 works, but your motherboard is the problem here.

George002000 · Oct 1, 2014

chris987 :

So I need to get a new motherboard?

unknownofprob · Oct 1, 2014

The bottleneck is too great when running in X4, so I would advise that you get a new motherboard which supports crossfire in either these configurations -

X16/X16

X16/X8

X8/X8

George002000 · Oct 1, 2014

unknownofprob :

What motherboard would you say? That doesn't cost to much money and supports the i7 2790k ➖
CPU

unknownofprob · Oct 1, 2014

if you mean 4790k then these motherboards -

Asus Z97-A

ASRock Z97X Killer

George002000 · Oct 4, 2014

unknownofprob :

So if I get one of these's motherboards will the crossfireX be working?

unknownofprob · Oct 4, 2014

should, yes. I would also get your current Z97-K board tested to see if it has any problems with the slots, just in case you purchase a board and the same thing happens. This will determine if the card is not at fault, or if both are.

George002000 · Oct 8, 2014

unknownofprob :

So at the moment the 2nd card isn't running at it's full extent? and if i get one of these motherboard's the 2nd one will be running as fast as it can?

unknownofprob · Oct 8, 2014

yes. that is correct.

George002000 · Oct 8, 2014

unknownofprob :

Ok that make's sense because i got the crossfire working but i get low FPS so that's why.. Thanks

unknownofprob · Oct 8, 2014

no problem

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Crossfire, Please help!!

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