Yesterday I added a Lexar SDHC 8GB PRO 133X to eBoostr, tried formatting it with exFat, tried NTFS, and the results were horrible. I had to repair MSOffice and Firefox, Thunderbird almost disappeared, som other programs ended to work so today I finnished removing the SD Card from eBoostr. Tried with and without Superfetch and Prefetch but nothing solved the problem. My system is Windows Vista 32 bit, 3 GB RAM, 1023 MB unmanaged memory and 500 MB NVCache for eBoostr. ReadyBoost and ReadyBoot disabled. I wonder if there is a limit of 4 GB cache for this card to be used with eBoostr?