Ok, I loved the Ultra100TX2, so I tried the Ultra133TX2. Tried using it in my older Dell Dimension XPST850 with the ATA133 drive I was previously using with the Ultra100TX2. Horrible experience! While it detected fine, my hard drive was horribly slow. Could have been my PC though. Maybe it couldn't handle ATA133. Ended up using this controller in another PC with an ATA100 hard drive (forcing it to act slower). Went back to the Ultra100TX2. Btw, no way to force the controller to act as an ATA100.
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