One of the established Mac parts sellers is offering Adaptec 2930 Power 
Domain SCSI cards for $15 USD and a 2940U2B PCI Ultra-2 card with link to firmware 
update for the Mac for $25.

The cards would be used in a 7500 and a 7300 both presently running OS 8.6 
and 9.1 with two hard drives on the internal 10MB/sec bus. The 7300 also has OS 
X 10.1.5 on the second drive.

First will these cards work OK in these machines? I realize the read/write 
performance of either card in these old machines will most likely be similar.

Second, when I can afford to upgrade my PCI Macs to a B&W or a native G4 Mac 
and newer version of OS X will I still be able to transplant these cards into 
the new machine(s)?

Further, with that future B&W or G4 would the 2940 offer a greater 
performance gain given the proper hard drives and cables; assuming the card is 
compatible.

Thanks --glen (no rush I'm in digest mode)

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