Hi guys and gals, long time lurker, first time poster here. I'm having a problem in regards to my crossfire build. I've had this build running crossfire for a few months, with absolutely no trouble whatsoever, but now all of a sudden things have gotten weird.
When I have both cards seated and power on the unit, only the card in the secondary PCI-e slot displays anything or is recognised. Even when I go into my BIOS 3D Browser, only the second card registers. As in, the system won't even POST while plugged into the primary card and once I get into the actual windows desktop (with it plugged into the second card), even the device manager only registers a single card, no yellow exclamations or anything.
The funny thing is, when there is just one card seated (put in the primary PCI-e slot), it works fine. It boots up, and everything is golden, apart from the fact that the other $250 graphics card is just sitting on my desk. Fancy paperweight. At first I suspected that one of the cards was broken, but when I switched them out, they both worked fine.
This has led me to believe that it is a motherboard issue, but I'm still a bit iffy on it. I've RMA'd the motherboard, gotten into arguments with the reseller and had the motherboard declared as fault free. I've done everything that I could think of, but nothing has worked. Any assistance would be greatly appreciated.
My build:
Asus B75M
Core i5 3570K
8GB 1600MHZ corsair ram
WDC 1TB 7500RPM HDD
Asus HD7850-DC2-2GD5-V2 (two identical cards in crossfire)
700W Corsair GS700 80+ Certified PSU
When I have both cards seated and power on the unit, only the card in the secondary PCI-e slot displays anything or is recognised. Even when I go into my BIOS 3D Browser, only the second card registers. As in, the system won't even POST while plugged into the primary card and once I get into the actual windows desktop (with it plugged into the second card), even the device manager only registers a single card, no yellow exclamations or anything.
The funny thing is, when there is just one card seated (put in the primary PCI-e slot), it works fine. It boots up, and everything is golden, apart from the fact that the other $250 graphics card is just sitting on my desk. Fancy paperweight. At first I suspected that one of the cards was broken, but when I switched them out, they both worked fine.
This has led me to believe that it is a motherboard issue, but I'm still a bit iffy on it. I've RMA'd the motherboard, gotten into arguments with the reseller and had the motherboard declared as fault free. I've done everything that I could think of, but nothing has worked. Any assistance would be greatly appreciated.
My build:
Asus B75M
Core i5 3570K
8GB 1600MHZ corsair ram
WDC 1TB 7500RPM HDD
Asus HD7850-DC2-2GD5-V2 (two identical cards in crossfire)
700W Corsair GS700 80+ Certified PSU
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