Five pieces
Nvidia has a cool link for five hotfixes that can make a big performance difference in your game setups. These patches are mainly going to improve gaming performance under SLI.
Alternatively, all 5 hotfixes are implemented in Service Pack 1 and at least Nvidia will urge anyone who tests to upgrade to Service Pack 1.
You can get these hotfixes here or simply go and download Service Pack 1 at Microsoft’s Website.
