Here you go:http://www.anandtech.com/bench/Product/61?vs=109
It doesn't show Battlefield Bad Company 2 but show Crysis, L4D among others. Hope it helps.
Although honestly, I do not see how the your OC'd E6550 will bottleneck the HD5770 as it is not too top of the line.
What resolutions are you playing at anyway?
thanks for the info, i play at 1920x1080. left 4 dead 2, portal, team fortress 2 work great with mid to highest settings on that resolution but then when i play battlefield bad company 2 i cant even play on the lowest settings without it lagging really bad even on a really low resolution. im not really sure if its a bottleneck but evertime i log into windows the welcome screen has really bad screen tearing for some reason and also when i log out of windows. it didnt do that when i was using a geforce 9600gt. i dont have my cpu overclocked right now since it doesnt feel any faster when i do have it overclocked.