well with your system, it's unlikely to do anything at all. on a lower-end system, it might however. although it did nothing for me with a 1GB memory stick when i tried vista on a P4 2.6 and 512MB of ram.
I've it on a Vista system with 1GB of ram and the memory usage with my 8GB flash drive is around 30%. After I've pulled out the flash drive the system's memory usage was round 50%.
The maximum amount for readyboost is 4GB, and there is a patch on somewhere on the microsoft's site that lets you used higher capacity USB flash drives and SDHC SD cards.
nikiaf@gmail.com 
