Not really the same, I'm running a Core i5 750 2.66Ghz, 8GB RAM, ATI 5870 with Win 7 64 bit.
I can mouse scroll, but I find it too inaccurate, and I want to be doing other things with my mouse when moving around, that's why I like keyboard scrolling.
edit: I've tried pretty much every setting combination. The problem is persistent.