I have bought a Gigabyte MA770T-UD3P mobo and a Sapphire HD4870 1GB DDR5 graphic card.
when starting pc, my card doesn't boot up. first I thought the problem is with the card but card was OK when I tested it on an old LGA965 mobo.
So, is that mobo incompatible with my graphcard? what should I do?
Does upgrading to a 780 or 785 mobo can solve my problem? thx
Then the problem could be your power supply. You still haven't provided the FULL system specs. The 4870 uses considerably more power than the 5770. If you have a no-name PSU it is likely not able to provide enough clean power to run the 4870.