View Full Version : b/w g3 ram combatibilities?

Jan 18, 2005, 02:14 AM
Hi I have a rev 2 logic board with w/ ati rage graphics card. My question is I have a old pc w/ pc 133 sd dimm (2x of 256mb) They are no-name brands, so what i really want to know, is should i invest in buying apple certified ram? the powermac g3 says it runs PC100 sdram, but i am pretty sure, for at least cp's that the mobo will automatically use it ram at PC100 speed settings, even if the ram is PC133 speed. thanks for all replys. I got it off ebay with like 64 mb ram, thought you guys might like to know. ;)


Jan 18, 2005, 03:41 AM
I have an iMac G3 that is a bit new than your PowerMac, so it actually uses the RAM at 133, but I put some Generic RAM in my iMac and it works fine. So if they say the 133 RAM will work, might as well go with the generic stuff. You probably just can't mix it with your old RAM.

Jan 18, 2005, 12:19 PM
The Powermac should use the PC 133 at PC 100 speeds, I've used PC 133 in a B&W before with no problems. And since you already have the RAM it can't hurt to put it in and see if it works. Worst case, it dosen't recognise the RAM.

Jan 18, 2005, 01:19 PM
I had 4 no name (2 of no name brand X and 2 of no name brand Y) modules in my B&W, which were pulled from old PC's. Never had a problem.

Jan 19, 2005, 11:25 AM
I have one 256 PC133 DIMM (Centon, I think) and three 128 PC100 DIMM's (all different generic brands) in my B&W Rev.2. Mine is probably about as much of a mixture as you could get away with! :p


Jan 19, 2005, 01:30 PM
Im running 2x256MB PC133 sticks. Allows me to overclock my FSB like i do.

Jan 19, 2005, 08:00 PM
Thanks for all your replys, i got 4 different 256 sd dimms so ill going to try to put a gb of ram in it! thanks for the help.


Jan 19, 2005, 08:33 PM
A gigabyte is plenty. Like I said, I have 640 MB, and OS X loves it.


Jan 19, 2005, 09:01 PM
I ran into this issue when adding memory to a B&W. There can be issues with larger DIMMS (256 & 512 MB) in the B&W.

Newer 256MB+ DIMMS are generally 'high density', with chips on one side of the DIMM module only. The B&W G3 memory controller will only see half the capacity of some of these gih density modules.

Older 256MB & larger DIMMS are 'low density' or 'double sided', with chips on both sides of the DIMM module. These should work OK.

If you buy them new, the 'Low Density' or double sided DIMM modules are typically 2X or more expensive than the more modern 'single sided' DIMMS, as they are only required for older machines like the B&W G3s.

You won't hurt your machine if you put a modern high density DIMM in, but the machine may only see half of the capacity.