I have just received my brand new Sapphire Dual X 280X (UEFI) graphic card and installed it. However, my computer won't post at all..
My system is:
Asrock 870 Extreme3
AMD Phenom II X4 955
PSU Fortron Green 600W
old ATI 5830...
The fans are running but the PC doesn't post, the screen is black.
If I unplug one 8 pin GPU power supply socket, the screen is still black but the computer runs fine and Windows start..
After looking on google, I am fearing that my motherboard is not compatible with this card. I think that is is due to the UEFI function..
I have found that the standard 280X Dual X GPU has a button in order to switch from UEFI to standard bios, I don't know is this one has also a dual bios?
However, there is a jumper (1 or 2) next to the CFX port, I don't know what is its purpose. I have tried both position, but no result.
I have updated to the latest version of my motherboard bios, and also a clear CMOS unsuccessfully. (I don't have a motherboard speaker)
I have also found that the 870 Extreme3 v2.0 does have a new beta bios which is apparently solving this issue.. but I haven't found anything for this one..
Could someone please tell me if my motherboard is compatible with this card or if there is any chance of making it work..?
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