Thanks .unicorn!! This is what the problem was! The default WinXP drivers are crap apparently.
Went to Promise's website and found an updated BIOS AND DRIVER for the card!
Ultra133 TX2
Name * * * * * *File * * * * * *Size * * Version * Platform Release Date
Ultra TX Series Windows Drivers 147.64KB 2.00.0.42 WinXP * *2003/05/06
Description
- Fixed burst data transfer rate performance issue
- Add support for Windows 2003 Server
I suspect the burst data transfer rate is exactly what the problem was. Thanks again!