I had the i3 530 (slightly slower then 540) and i saw a huge bottleneck on my radeon hd 7870.
although your card is not as powerfull, i believe it will still have a bottleneck. future upgrading is possible as well.
for gaming at recommend an quad core like the i5 serie's (the i7"ns are still a bit overkill)
don't understand me wrong do, this will run your game's but you won't be able to get the most out of that graphics card