THX for the replies. I remember a post on some problem with speed, maybe it was yours, bmg. Could the slow write speed be due to the OC'd PCI speed? Also, which OS and driver version were u using? I'll be using both 98SE and W2000. (No ME for me) John, did it just lock up, fail to boot, or what? And, Tates, why only slot 1, will it not share IRQ's? Sorry to ask so many ? but 1st time doing IDE RAID.