NVIDIA SLI and ATI CrossFire are designed to provide scorching dual-GPU 3D goodness. Only trouble is, Windows Vista may not have been cooperating.
The Solution for the "Dissing Your Second GPU" Blues
X-bit Labs reports today that Microsoft has released a fix for systems that ignore the second GPU. According to Microsoft Knowledge Base article 936710 , the solution involves replacing three files (D3d10.dll, D1d10core.dll, and Dxgi.dll). Updates are available for all Vista editions, both 32-bit and 64-bit.
It's going to be interesting to see what happens to Vista gaming performance after the updates are made.