[G4] Memory Mixing Problems (pc100 & pc133)

[Jonathan I. Nori]

On my DP G4 533 I have two 512's and a 128mb.

I have to have the 512's in the first two slots, and the 128 last. I have to have the memory in same-to-decreasing size otherwise my machine fails on startup.

Try putting your larger memory in the first slot, and the smaller memory in the other slots.

The pc133 *should* be able to coexist with the pc100, but it will run at pc100 speeds. (At least this is how it works in the PC world...I haven't tried mixing other speeds on my Mac, just sizes.)

Hope this helps...

Jon  8^)

>>> 2AzBoys at cox.net 01/05/05 02:01PM >>>
Hello everyone,

I am trying to add additional memory to my G4 450 AGP. I have 3 128mb 
pc100 chips installed and am trying to add a 512mb pc133. I placed the 
new 512 in the 4th slot (DIMM3/J24) when I tried it. System ran fine 
for about 2 hours after installation, then programs began to crash at 
random. After a restart, the entire system started locking up and I had 
to use the reset button each time to restart. I finally pulled the 
chip, repaired permissions and now everything is fine once again.

I looked on the G4 forum and several other people have mixed memory 
(both pc100 and pc133) and they work great. Apple web site says to use 
only pc100 on a G4 450 AGP, but other web sites say its ok to use 
pc133. Any ideas? Thanks for your help.

Here is my G4's info:

   System Version:		Mac OS X 10.3.7 (7S215)
   Kernel Version:		Darwin 7.7.0
   Machine Model:		Power Mac G4 (AGP graphics)
   CPU Type:			PowerPC G4  (2.8)
   Number Of CPUs:		1
   CPU Speed:			450 MHz
   L2 Cache (per CPU):		1 MB
   Memory:				384 MB
   Bus Speed:			100 MHz
   Boot ROM Version:		4.2.8f1

Details on currently installed memory:

DIMM0/J21:
   Size:	128 MB
   Type:	SDRAM
   Speed:	PC100-322S

DIMM1/J22:
   Size:	128 MB
   Type:	SDRAM
   Speed:	PC100-333S

DIMM2/J23:
   Size:	128 MB
   Type:	SDRAM
   Speed:	PC100-333S

DIMM3/J24:
   Size:	Empty
   Type:	Empty
   Speed:	Empty

Thanks again.

Casey
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