I'm running a Promise ATA100 controller card under 2k with no problems at all I have 2 IBM drives, both as masters on the card.
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System:
Asus P2B-D
Dual PIII 700mHz Slot 1
256 mb ram
30.7G ATA100 IBM HDD(2)
Promise ATA100 Controller
Matrox Millenium G400 MAX
CD CDR (all masters)
19" Syncmaster (.20 dpp)