Amiga.org

Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Hamlet on May 10, 2004, 03:40:42 PM

Title: Which memory is faster?
Post by: Hamlet on May 10, 2004, 03:40:42 PM

Hello,

I've got an A4000 with CSPPC, and I've got a question about the memory...

Which is better:

* To strip any fastram from the mb and only use csppc slots.
* To put as much ram as possible on the mb.
* No diffrence.

16 more or less doesn't really matter, as long as it doesn't slow the machine down in general.

While I'm at it, what xfer speeds can the scsi module on the csppc reach?

Regards,
Ham

Title: Re: Which memory is faster?
Post by: KennyR on May 10, 2004, 03:43:56 PM

As far as I know, your system will use the fast CSPPC RAM first and only use the motherboard RAM when it runs out, so you're quite safe to have both.

The CSPPC SCSI module does about 20MB/s.

Title: Re: Which memory is faster?
Post by: nOw2 on May 10, 2004, 03:51:44 PM

Leave all the memory in. The slower mb memory has a lower priority and so will not be used unless the CS-PPC RAM is used up.

Quote

While I'm at it, what xfer speeds can the scsi module on the csppc reach?

At least 17MB/s ( http://www.amiga-news.de/de/news/AN-2001-04-00067-DE.html ). I'm sure mine did 20MB/s.

Title: Re: Which memory is faster?
Post by: Acill on May 10, 2004, 03:54:03 PM

When I was still using my A3000 and a CSPPC card I tried it both ways and never noticed anything. So my guess was it didnt matter. I've also heard the CSPPC RAM is used first. Also see if you can find 60ns RAM. MAke sure your CSPPC is also setup to use it. Hold the ESC key at bootup and look in to see that the 60nc RAM is selected. Its quite a speed up.

Title: Re: Which memory is faster?
Post by: Ilwrath on May 10, 2004, 04:27:30 PM

I stripped the ram from the motherboard in my A4000 when I installed my CyberStorm mk2.  (Well, except for the CHIP ram, of course!)  

I did notice a slight speed increase in benchmarks vs having motherboard RAM instaled.  Not more than a half percent, though.  Mighta just been moon-phase or sunspots.  ;-)

Certainly, though, you want to put as much RAM as you can on the CSPPC.  Put the leftovers on the motherboard, if you like.  If not, the absense hasn't caused me any problems...

Title: Re: Which memory is faster?
Post by: Lemmink on May 10, 2004, 06:19:24 PM

The theoretical throuputmaximum of the UWSCSI on the CSPPC and CSMKIII should be 40MB/s. According to the definition of the UWSCSI-standard (AFAIK).
I managed to get 23 MB/s out of my best drive in real live.
I heard of people to reach as much as around 30 MB/s. 15 MB/s should be archived easyly by any UWSCSI-drive on that controller in syncronus mode.

Title: Re: Which memory is faster?
Post by: Hamlet on May 10, 2004, 07:56:44 PM

Thx guys, just what I wanted to know!

Title: Re: Which memory is faster?
Post by: zipper on May 10, 2004, 09:13:49 PM

I have two drives, 29 and 30 MB/s raw speed. And 144 MB Ram, no difference I suppose.