Question about data bus speeds on older Macs

iTurbo

macrumors 6502
Original poster
Sep 9, 2008
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356
I've been slowly acquiring parts to upgrade some of my older Macs to SSD. I've been looking at bus speed comparisons to get an idea of where the bottlenecks would be at and came across this article from lowendmac.com

http://lowendmac.com/2018/how-fast-is-your-data-bus/

Is the bus speed comparison in this article accurate?

Specifically, I'm wondering because I plan to put an SSD into a PM 6500 using the Sonnet SATA PCI card, which plugs into a PCI bridge card (which a MOTU audio card also occupies), which then plugs into the motherboard's PCI slot etc...
 

TzunamiOSX

macrumors 6502
Oct 4, 2009
301
46
Germany
I have an 9600 with G4 450 and a SSD on a SATA 1 Host Adapter (around 100 MB/s is possible with PCI 2.0).
With luck you get arround 20-30 MB/s but latency is much better with a SSD

Bottleneck is the CPU and the CPU Bus i think.
 
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iTurbo

macrumors 6502
Original poster
Sep 9, 2008
298
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Thanks. This particular 6500 has a Sonnet 500 Mhz G3 in the L2 cache slot, so that oughta help.

I guess I was just surprised that the linked article shows the older parallel ATA bus speeds as faster than a lot of the older 'pro' SCSI busses. I'm not expecting miracles with this 6500, just hoping that it will be a hell of a lot faster than the old 60gb PATA hard drive. Mostly hoping for basic audio/MIDI recording and nostalgia of course.
 
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TzunamiOSX

macrumors 6502
Oct 4, 2009
301
46
Germany
With my Adaptec PowerDomain U2W SCSI I got around 60-70MB/s but it is not working anymore (dont know why, but something is wrong with the firmware, and he is also not full kompatible with 10.4)