Oh yeah, Windows live makes sure of that....With fraps I get around 40-60 fps, so it's very playable, just the road surface stays gray in the tunnel when approaching....It's back to is potholed self once in. That's in both on GTA4 and EFLC......
But you want to know what the ultimate insult is? I built this system primarily for GTA4, I tweaked upgraded parts to get it to run smooth, and short of a i7 and a 2 gig card it probably runs as smooth as it gets....In the final mission I have no problem with the car chase...the shootout at the old casino....chasing the chopper with the boat...getting to Little Jacobs chopper all easy, but you have to tap on the space bar to get Niko to climb in the chopper....no talent involved, but he won't climb in!!! It's a known glitch that if you have a fast system you have to SLOW down the frame rate!

Maybe the next patch will fix that?