My GT240 has 2.7gb of ddr5 i believe and my bro is the ASROCK mobo and he currently has radeon hd 4300/4500 card he wants to upgrade to the 6570 card is it worth it?
It also depends what case you have as well, not just motherboard. If it's the only gpu you're running, according to case and mobo you use it's compatible. If you can though, i'd step it up a bit because that card is too minor of an upgrade to be worth the trouble.