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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: jaesonk on November 25, 2025, 05:43:40 AM

Title: Amiga SCSI Benchmarks?
Post by: jaesonk on November 25, 2025, 05:43:40 AM

Hello,

I'm looking for an Amiga SCSI controller benchmark chart/list comparing speeds of various controllers (ZORRO and turbo-card).  I posted a similar message a couple years ago, got some response, but not a lot.  I thought I had a more comprehensive list, but can't find it now.

I've heard GVP TREX-II is one of the fastest, or the fastest, getting something like 30mb/sec, but I can't find an actual benchmark reference now.  CSPPC with SCSI-III seems like it should be faster. 

If there's comprehensive speed comparison list somewhere, let me know.

Thanks,
Jaeson

Title: Re: Amiga SCSI Benchmarks?
Post by: zipper on November 25, 2025, 12:44:20 PM

I think 30mb/sec was quite hard to get with CSPPC - my figures were between 22 - 26 IIRC. diid see some a bit higher but 30 can't remember. Well, somebody wrote here 2005:
CSMKIII and CSPPC offer theoretical maximum of 40MB/s transfer, for UW-SCSI. With a really good drive, I've managed to go slightly above 30MB/s.

Title: Re: Amiga SCSI Benchmarks?
Post by: smf on November 25, 2025, 02:32:07 PM

And how would you like the benchmark to be performed?

I don't have any recent ones available.
But here's a ~10 year old sysspeed screenshot from when i was testing a dirt cheap reflashed acard 7722 ide-scsi bridge with some random IDE drive on my csppc.

(https://safir.amigaos.se/bildgalleri/users2/15993_acard772cybppc.png)

Acard 7722 is not meant to be used with harddrives and needs to be reflashed to work with that but i have another acard that iiirc is faster and it nowdays operates with some sata SSD drive and it's really good.

Title: Re: Amiga SCSI Benchmarks?
Post by: jaesonk on November 25, 2025, 04:52:11 PM

Thanks.

Benchmarks would be affected by the drive used, so that would be worth noting.  Read vs Write speeds would also be worth noting.

In an old email, I found this about GVP T-Rex II 50mhz 060 SCSI performance:

BusSpeedTest v0.19 @ 50 MHz:
41.3 MB/s readm
22.3 MB/s writem


Jaeson

Title: Re: Amiga SCSI Benchmarks?
Post by: smf on November 28, 2025, 07:24:02 AM

afaik BusSpeedTest  is a memory speed tester so what does it have to do with scsi if so?

Title: Re: Amiga SCSI Benchmarks?
Post by: jaesonk on November 28, 2025, 01:51:30 PM

Thanks for pointing that out.  I didn't look up BusSpeedTest.  The old email was a response to my query about T-Rex-II SCSI speeds, but as you point out, maybe the provided information is really a memory speed test.

Jaeson