If you are using a Shuttle HOT-433, I do not recommend using SCSI on Windows 2000. There are bus mastering issues and it won't boot. A HOT-433 w/SCSI and NT4.0 should be solid. The HOT-433 is a little flakey in my opinion. A HOT-433 w/SCSI and Win98SE should be fairly stable, but I've seen some issues (repeated drive access which resembles a hang-up that eventually comes around). I beleive those issues were infrequent though.
The Ultra160 card you are refering to, I tested in DOS on a Biostar MB8433-UUD motherboard, which is also based on the UMC chipset, and it worked. However, this Biostar has no issues with SCSI bus mastering, not even in Windows 2000, so I cannot say how well the HOT-433 will do.
I personally use an Adaptec 2940U2W Ultra2-LVD card in my 486's. You can refer to the World's Fastest 486 link for my list of hardware known to work well in my UMC-based 486.
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