For Win 7 Pro - If 2 pagefiles on separate disks are created, say 800MB on OS drive and 16GB (to match system RAM) on SSD, which pagefile will Win 7 use first? Assume the SSD is faster than the OS drive.
From the TechNet article titled Learn Best Practices for Optimizing the Virtual Memory Configuration:
As mentioned, multiple page files, as long as they are located on separate physical disks, can potentially improve the paging speed since the different disk controllers can simultaneously handle multiple requests. So it's not a case of which page file Windows will use first (if serial access was involved, there would hardly be any benefit of using multiple page files), but rather that Windows can potentially use both at the same time to boost performance.