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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Sandman on October 29, 2008, 09:47:59 PM

Title: SCSI HD->SCSI vs. CF->IDE->SCSI Speed
Post by: Sandman on October 29, 2008, 09:47:59 PM

Just getting ready to throw a Large SCSI HD in my A4000D connected to my WarpEngine, but was thinking.... I might be able to live with the noise but those suckers get hot! :madashell: I am wondering if that might be a prob in my system.

I am using a CF card now with a CF->IDE adapter and was thinking of picking up a IDE->SCSI adapter but was wondering if there is a decrease in speed using CF->IDE->SCSI compared to SCSI HD->SCSI.

Any experience with this out there?

As always, THANKS!
Tim

Title: Re: SCSI HD->SCSI vs. CF->IDE->SCSI Speed
Post by: MozzerFan on October 29, 2008, 10:27:16 PM

I recently bought a CF-IDE adapter (already had a scsi-ide adapter). I get ~7.5 MB/s. It's connected to my Cyberscsi. The benchmark tool I used was diskspeed 1.2 (included in sfs archive).

Edit: the CF card is a 4GB Sandisk Ultra II.

Title: Re: SCSI HD->SCSI vs. CF->IDE->SCSI Speed
Post by: Kin-Hell on October 30, 2008, 04:03:45 PM

31Mb/Sec on CSMKIII SCSI using 18Gb IBM Drive. Ram & SCSI is running @ 34mhz, not stock 25Mhz. Ram Refresh is 51.1ns   :-D

Title: Re: SCSI HD->SCSI vs. CF->IDE->SCSI Speed
Post by: Damion on October 30, 2008, 08:53:52 PM

There won't be a decrease, until you hit the transfer limit of the CF card. On a 2 gig SanDisk Ultra II, the limit is about 13 MB/sec, and around 10 on a standard SanDisk 2 gig card. (Generic benchmark measurement.) On my Tekmagic 2060, I'm getting just under 10 MB/sec with an Ultra II card, which is right around the controller's maximum. (I had to manually set the synchronous flag in HDInstTools, otherwise speed is nearly halved.) I'm pretty sure that the WarpEngine SCSI is also around 10 MB/sec. I also noticed no decrease with an GVP A530 turbo, Impact A500, or Impact A2000. Actually, the CF cards are often much faster than old SCSI drives.

In the case of CS MK3/PPC SCSI, a real HD is probably best. 31 MB/sec on classic miggy is damn fast :-)

Title: Re: SCSI HD->SCSI vs. CF->IDE->SCSI Speed
Post by: RMK305 on October 30, 2008, 09:41:36 PM

I've not had any overheating issues with my SCSI drive in my Warpengined A4000D. The difference in speed compared to the IDE drive is staggering.

Title: Re: SCSI HD->SCSI vs. CF->IDE->SCSI Speed
Post by: djbase on October 30, 2008, 10:36:42 PM

I am using a 32GB CF card with the Yamaha IDE SCSI bridge on my Blizzard 1260 and getting 8.5 MB/s tested with SCSISpeed (part of DiskSpeed, check Aminet). But most important part is the usage of DMA which helps your CPU a lot against the IDE interface in Amiga.

Title: Re: SCSI HD->SCSI vs. CF->IDE->SCSI Speed
Post by: Kin-Hell on November 01, 2008, 02:57:29 PM

Quote

RMK305 wrote:
I've not had any overheating issues with my SCSI drive in my Warpengined A4000D. The difference in speed compared to the IDE drive is staggering.

Compare your Warp Engine SCSI to another board of the same specification, the Warp engine will blow away the competition. Such  is the nature of the WE with 60ns ram!  ;-)

Title: Re: SCSI HD->SCSI vs. CF->IDE->SCSI Speed
Post by: Kin-Hell on November 01, 2008, 02:58:47 PM

Quote

-D- wrote:
MK3/PPC SCSI, a real HD is probably best. 31 MB/sec on classic miggy is damn fast :-)

Should see the G-REX fly on this baby m8. It's just stunning!  :-D