sounds like you need a better set of GPU's...
GTX 275 and HD 5750 are/were MEH @ best anyways.
Well GTX 275 is same power as GTX 460 1GB so it is still alright and was a great GPU in 09/11 but is now getting a bit long in the tooth but still 40fps in BF3 maxed is not bad for GTX 275. I rather spend my money on other things than just my gaming rig like Camping, Hunting, House, Quading, Racing, Girl friend, Life, etc but I may invest in a good 78xx if and when they are available if price is right $200ish. Metro is a real stickler of a game I think it sucks but the graphics are some of if not the best even still to this day imo and it real is a great benchmarking game and that is why I bought it and use it for peace out man have a great day.