how to know wheather a graphics card is compatible for a motherboard

[GEELU605]

do amd radeon r9 280 sapphire dual-x oc 3gb run properly on
core i5-3470@3.2GHz-processor
gigabyte ga-b75M-d3h-motherboard???
and is that graphics card overclocked by manufacturer
thanks in advance

 

[dottorrent]

You don't. They're all compatible.

 

[GEELU605]

i didn't understand??

 

[GEELU605]

You don't. They're all compatible.

i didn't understand??

 

[British_and_Proud]

You don't. They're all compatible.

i didn't understand??

It should run on your PC, and yes it is factory overclocked by the manufacturer; however you can overclock further.
I'm pretty sure there won't be a bottleneck. You need to make sure you have at least a 500w power supply, or 850w if you're going to have a crossfire setup.