English Amiga Board


Go Back   English Amiga Board > Support > support.Hardware

 
 
Thread Tools
Old 03 May 2008, 01:51   #1
Kristian95
A4000T owner :)
Kristian95's Avatar
 
Join Date: Jan 2006
Location: California, USA
Age: 46
Posts: 498
Mainboard RAM vs. CSPPC RAM

In my A4000T I have a CSPPC board with 96 mb RAM installed while the mainboard does only contain the standard 2 mb chip RAM.
Would it be any good to install the 16 mb RAM on the mainboard or would the access of that RAM be too slow??
Also, would it make any difference if I changed the 2 x 32 + 2 x 16 mb RAM on the CSPPC to 4 x 32 mb RAM ?? I don't even know whether it is 70 or 60 ns RAM, how much speed difference would I get from making sure I have 60 ns RAM when the PPC CPU on my CSPPC card seems to be bust?
Kristian95 is offline  
Old 03 May 2008, 03:34   #2
rkauer
I hate potatos and shirts
rkauer's Avatar
 
Join Date: Oct 2007
Location: Sao Leopoldo / Brazil
Age: 55
Posts: 3,482
Send a message via MSN to rkauer Send a message via Yahoo to rkauer
60 ns are better, of course. 50ns better than anything (but hard to find).

If the PPC is dead (BGA CPU sucks, it is hard to replace) your board will act like a regular CyberStorm.

The on-board 16Mb Fast are slow than the installed on the card, just give it a lower priority (good for memory-hungry applications, like the new OWB browser).
rkauer is offline  
Old 03 May 2008, 08:22   #3
alexh
Thalion Webshrine
alexh's Avatar
 
Join Date: Jan 2004
Location: Oxford
Posts: 12,656
I always have FAST RAM on my A4000's mainboard, but I have heard lots of people say the A4000 is faster without it.
alexh is offline  
Old 03 May 2008, 08:26   #4
musashi5150
move.w #$4489,$dff07e
musashi5150's Avatar
 
Join Date: Sep 2005
Location: Norfolk, UK
Age: 39
Posts: 2,327
What tool would I use to change RAM priorities?
musashi5150 is offline  
Old 03 May 2008, 09:37   #5
Boot_WB
Novice in the Black Arts
Boot_WB's Avatar
 
Join Date: Nov 2004
Location: Kingston upon Hull
Age: 45
Posts: 263
I believe the motherboard RAM always has a lower priority than accelerator RAM by default (zorro RAM has a lower priority still).
Unless you are using more RAM than your accelerator has on board, you would never access the fast ram on the motherboard.

The 60ns / 70ns refers to latency rather than read/write cycle time, so you will not see a (70/60)X increase in speed, but there will be some benefit.
Boot_WB is offline  
Old 03 May 2008, 23:19   #6
rkauer
I hate potatos and shirts
rkauer's Avatar
 
Join Date: Oct 2007
Location: Sao Leopoldo / Brazil
Age: 55
Posts: 3,482
Send a message via MSN to rkauer Send a message via Yahoo to rkauer
Quote:
Originally Posted by Boot_WB View Post
I believe the motherboard RAM always has a lower priority than accelerator RAM by default (zorro RAM has a lower priority still).
Unless you are using more RAM than your accelerator has on board, you would never access the fast ram on the motherboard.

The 60ns / 70ns refers to latency rather than read/write cycle time, so you will not see a (70/60)X increase in speed, but there will be some benefit.
I have a 128Mb-60ns in here. Due some stability problems (now solved), I had to set it to 70ns. Boy! The Amiga was running like someone pushing a block of concrete over cold molasses! Crappier than an A1000 running Myst!
rkauer is offline  
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Games that detect more ram should have the extra ram by default diablothe2nd support.FS-UAE 4 14 April 2013 14:03
[SAS/C] Making malloc() allocate in fast RAM instead of chip RAM? 8bitbubsy Coders. General 3 07 August 2011 07:06
What RAM is used first? The 4000 m/b ram or the csppc ram? keropi support.Hardware 3 27 August 2006 21:25
For sale: Blizzard 1230 MK IV with FPU+ RAM +ELBOX tower + A1200 mainboard martin-flash MarketPlace 1 02 November 2005 11:37
128 MB RAM SIMM 72-PIN - FPM RAM - 66 MHz - 5V - 60ns - Parity Effy MarketPlace 8 29 April 2005 17:21

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +2. The time now is 15:53.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Page generated in 0.12115 seconds with 15 queries