I bought a video card Asus Radeon R7 265, when installing in the motherboard Intel DP55SB not work the video. Post code A5 or Eb or 0_. Im update bios motherboard and bios video card.
Thanks for your answer!
My configuration is:
Motherboard Intel DP55SB
i5 760 proccessor
Power supply 600w
The motherboard supports PCIe 2.0, the video card is PCIe 3.0 and will claim backward compatibility.
The motherboard was made 8 years ago and did not know what the future held. https://ark.intel.com/products/40079/Intel-Desktop-Board-DP55SB Intel® Desktop Board DP55SB Product Specifications
I would suggest a firmware update to the video card, if one is available that addresses PCIe 2.0 compatibility.
Otherwise, look for a card that is truly backward compatible.
My personal opinion is, if you have a nice, new graphics card, get a nice, new motherboard. Otherwise, you will be operating in a degraded mode with PCIe 2.0.