Solved

Non-parity vs. True-parity RAM

Posted on 1998-05-20
5
718 Views
Last Modified: 2013-11-17
What is the difference between non-parity RAM and true-parity RAM?

I have 80Mb in my PowerMac and need to add another 64Mb.  Previously, I added a single 64Mb 60ns DIMM next to a previously-installed pair of 8Mb DIMMS.

Should I put a "true-parity" 64Mb DIMM in the corresponding slot?  Or will it not work?  How can I tell if I'm getting the best performance from my DIMMs if I do not know if the old 64Mb installed is parity or non-parity?
0
Comment
Question by:archken
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
5 Comments
 
LVL 6

Expert Comment

by:TheHub
ID: 1535869
Macs ignore the parity part of the chip if it is present. So, it will work with or without parity-RAM. For more information about upgrading RAM, goto:
http://www.newertech.com/software/guru.html
0
 

Author Comment

by:archken
ID: 1535870
Well this helps me to better understand of RAM.  Perhaps my question should not be so specific.  Thank you for the web link.  I've downloaded GURU, and yes, it has accurate info about my PowerMac.

So it seems I can totally ignore the aspect of Macintosh RAM being non-parity or true-parity.

This leads to the question of "interleaving memory."  What is it?  How can I tell if I'm benefitting from it?

Do I need to be concerned about the type of my existing 64Mb DIMM when I shop for another 64Mb?  Do I need to match speeds (60ns) or composition (the little black pieces on the chip) to get best performance?  How can I test it to be sure?
0
 
LVL 6

Accepted Solution

by:
TheHub earned 200 total points
ID: 1535871
RAM is already fast. Chances are that you would not notice the 10 - 30% increase in speed. However, ones ability to notice said increase has no bearing on the existance of an increase.

interleaving: click on the configure button under the Memory menu in GURU. Up pops a diagram of DIMM slots. interleaving is 2 same size cards in corresponding Ax and Bx slots where x is 1, 2, 3...etc.

Most machines that can use interleaving require 60ns chips.

Composition is irrellevant.

Plug it in.

This response was given in good faith and exceeds the one question limit by quite a bit.

good chips and prices:
http://www.datamem.com

good luck
0
 

Author Comment

by:archken
ID: 1535872
Thank you for extending your valuable information to answer my complete question.

Of course your response in good faith deserves the reward of the full 200 points.
0
 
LVL 6

Expert Comment

by:TheHub
ID: 1535873
groovy man
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Create a default user profile for Mac OS X 10.7/10.8 Create a user account on OS X that will be a template for every other user of that computer. I usually call it “profile” and make it an administrator account for the time being. 1. Install a…
A lot of new and distinct gadgets are making their appearance every other day. The latest gadget that has wooed the attention of all gadget lovers and non gadget lovers alike is the Smartwatch. This tiny gadget is capable of offering live access to …
In this video, viewers will be given step by step instructions on adjusting mouse, pointer and cursor visibility in Microsoft Windows 10. The video seeks to educate those who are struggling with the new Windows 10 Graphical User Interface. Change Cu…
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…

631 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question