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I've tried ReadyBoost on a desktop and a couple of laptops. The desktop (8GB RAM, 1TB system drive) showed no real performance increase from ReadyBoost. One laptop with 1GB RAM and a 5400 RPM 320GB HD showed a noticeable performance increase while the other laptop with 2GB RAM and a 7200 RPM 250GB hard drive matched the desktop in showing no real performance increase. The desktop is x64 with a "high speed" USB flash drive while the laptops are x86 and used an SDHC flash card.

As usual, my results were for my application mix. YMMV.