So it came to pass that I had to do another G450 install on a Windows 7 machine, and when I went to Matrox’s web site, I still did not see drivers listed specifically for Windows 7. I did do some digging however, and found that this non-WHQL driver package works perfectly. It was listed as supporting “Windows Server 2003 x64, Windows XP x64, Windows Vista x64, Windows Server 2008 x64″. If it supports Server Win2k8 R2, it should also support Windows 7.
As luck would have it, the install went smoothly and I have a pair of the cards working in a brand new Core i5 machine as I type this.