I`ve been using it a bit on bootcamped Win7 x64 (Mac Pro Xenon, 2009, 2,6ghz I think, 6GB RAM) w/Cubase 5, and I havent experienced any problems this far.
It doesn`t lag on my rig, have you tried upgrading your nvidia driver? Might perhaps be some chipset-drivers thats out of date. From what i`ve experienced some chipset-drivers that is inculded with win7, creates a few problems, might help to use the driver from the manufaturer.
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Cubase SX 4/5, Roland JP8080, Novation Supernova II, Access Virus KB, Access Virus Snow
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