: Memory in 7600 A4-B4, A3-B3 .....???

Feb 5th, 2004, 06:03 PM
:confused: I hear somewhere that you should put your memory the largest (128 mb) in A4-B4 and going down in size(64mb, 32mb) and number, A3_B3, A2-B2 etc.

If somebody know if itís true and watís up with this?????? smile.gif

Feb 5th, 2004, 07:04 PM
Actually, this setup is for Interleaving, where if you were to place the same size of RAM in the corresponding slot (A3 and B3), you would see a slight performance gain.

So, if you were to place a 128mb Dimm in A1 and another 128mb Dimm in B1, you will see a performce increase over if you were to place a 128mb Dimm in A1 and another 128mb Dimm in A2.


Feb 5th, 2004, 09:17 PM
there is a great little utility, the GUide to Ram Upgrades (GURU) that will explain much.

has information on all PPC macs, including clones and laserprinters.

click HERE (http://www.lowendmac.com/software/guru29.sit) to download it.

Terry O'Leary
Feb 6th, 2004, 05:59 PM
The original poster DOES have the order of installation right.
fill A4 and B4 first with thee largest DIMMs, then A3 and B3 etc.

I can't remember if you are supposed to fill the Bs before the As. i.e. from largest DIMM to smallest ...

B4 A4 B3 A3 B2 A2 B1 A1

- Terry

Feb 6th, 2004, 10:02 PM
I've got quite a few PCI Macs, and have never had any problems with mixing the slots by size.

If I plan on using the machine in a particular configuration for any amount of time, I usually will match the slots for interleaving. I've never really noticed a speed difference, but I figure every little bit helps on these old machines...

Feb 7th, 2004, 05:23 PM
You can download a copy of GURU from Newer RAM GURU (http://www.newerram.com/products/guru/) I Think you can choose your machine RAM quantity and it will show the proper slots to insert the DIMMS into.