my laptop is running windows 7 ultimate x86, 4gb of ram, core 2 duo t9500 2.6, and gf 8600m gt, but it runs like crapola, i even changed to only 256mb, lowest quality, looks and runs the same. maybe it's not actually chaning those options?
Similar here: Dell Precision M6400, QX9300 CPU at 2.53GHz, 8 GB RAM, nVidia Quadro FX3700M, and the performance is typically quite slow and choppy, though not always so. But the sputtering makes it not only visually not so appealing, but also makes it harder to predict and use. I'm more productive with it off, at the moment.
This has got to be a matter of some sort of idiosyncratic incompatibility or conflict somewhere--more than enough horsepower to run it 10 times over at full speed, I'd think.
I don't play games that much on this system, but when I do, involving graphical tasks orders of magnitude more challenging than OD2, I've no problems.