Microsoft has released a hotfix to support the new 64-bit CPU from VIA Technologies. You can apply this hotfix on computers that are running Windows Server 2008 or Windows Vista Service Pack 1 (SP1). This hotfix adds the ID and vendor strings for the new VIA 64-bit CPU. After you apply this hotfix, computers that are running Windows Server 2008 or Windows Vista SP1 can recognize the VIA 64-bit CPU and the system model that is based on this kind of CPU.

Consider the following scenario. You connect an Institute of Electrical and Electronics Engineers (IEEE) 1394 hard disk to a Windows Vista-based computer that uses a VIA Technologies 1394 host controller. However, performance is slower than you expect when you read from the hard disk or write to the hard disk.

For example, you may experience decreased reading and writing performance of approximately 20 percent in Windows Vista when you compare it to Microsoft Windows XP with Service Pack 2 in the same test environment.