FSX/readyboost drive/performance

Hi,

My understanding is that a ready boost drive is a usb drive that vista uses
to dump data to, rather than a hard disk as the readyboost drive is
considered to be faster than the hard disk.

So if my comment above is true, and I can now buy a 32gb readyboost drive
for $70, is it a good idea to install games such as FsX onto a readyboost
drive, and get better performance than using a HDD...

???

Thanks