the desktop radeon 5670 should be able to hit well over 30 fps online if you're willing to compromise visual settings. A much weaker laptop Radeon 5650 can get those frames at 1366x768 lowest settings.
if you can't stand low res textures etc it's best to upgrade your video card first and buy the game later. Actually, regardless of the situation don't buy the game now. It has been discounted to $30 before - and it could well get a similar discount this xmas. EA is actually putting in some effort to have Origin be competitive with Steam, so they do have decent discounts.
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