I use a TT in my 7300 running NetBSD. The only problem with it is that the kernel keeps thinking it's ATA/33 which is a bit of speed hit, but it works well enough. I *am* running an old kernel, though (but the machine is to be retired in a few months, so no point in upgrading now).

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Why is it being retired? They're still good PowerPC machines... Anyhow, I don't think they're fast enough to saturate an ATA/33 bus. My PowerMac 9600 with 1 GHz G4 running NetBSD with an 80 MB/sec ATTO SCSI card peaks at around 40 MB/sec when copying and averages around 20 MB/sec. Another 7600 machine with an ATA/66 card and a 700 MHz G4 only does around 15-16 MB/sec:

wd0 at atabus0 drive 0:

wd0: drive supports 16-sector PIO transfers, LBA48 addressing

wd0: 149 GB, 310101 cyl, 16 head, 63 sec, 512 bytes/sect x 312581808 sectors

wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)

wd0(acardide0:0:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66) (using DMA)

My 8500 and 7500's don't get used too much these days. I have a 9600/350 waiting for some AVID cards (hopefully one of these days) to make that useful.

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Are you looking for ABVB cards?