Some points to consider (for those who don't know it already)
- 32-bit versions of Windows Vista and Windows 7 (and for that matter, all previous versions of Windows) can typically use only a max of 3.25GB RAM even if you have 4GB physically plugged in
- The remaining .75GB is reserved for I/O address space and other similar purposes by the OS
- What follows next will NOT allow you to use *that* unused .75GB of RAM (if you have it) as RAM itself, but as a RAMDisk, which can be used for ReadyBoost purposes
- SuperSpeed has a product line called RamDisk/RamDisk Plus that will allow *that* unused .75GB of RAM to be used as a RAMDisk
- This will only work if your mother board's BIOS supports and allows you to remap memory above 4GB. Most Asus boards have this as "Memory Remap Enable/Disable" under the ChipSet/NorthBridge settings
- The Plus version provides an option to save RAMDisk contents to an image file at shutdown and restore from it at startup
- It can supposedly use RAM even beyond the 4GB limit, but I don't know this for sure (need to check with another 2GB stick, in which case this can be used as the disk for the paging file, instead of using for ReadyBoost)
- When I added a 768MB RAMDisk with the "Memory Remap" option disabled in BIOS, I saw that amount decrease in the amount of free RAM shown by Task Manager. This decrease did not happen when the "Memory Remap" was enabled in BIOS and RamDisk Plus was configured to use this (what they call) "unmanaged memory" of .75GB
- After a few hours of usage (GPU folding + 4 x CPU-VM folding using up 100% CPU and RAM) along with usual browsing, downloads and what not, I felt that the system was snappier than usual (due to the heavy amounts of paging typically involved on my rig due to folding). But this could have been my imagination and YMMV
