G3 B&W Ram types?

6 posts / 0 new
Last post
Offline
Last seen: 14 years 6 months ago
Joined: Oct 19 2004 - 11:21
Posts: 18
G3 B&W Ram types?

Does anyone know if there should be an issue with installing single sided ram with Double sided ram?

I have 2 sticks of 256mb x 16 chip 133mhz ram

and 2 sticks of 128mb x 8 chip 133mhz ram

I can install any single stick in J19 and it works great.. or pairs of the various types.

But 8chip with 16chip and I seem to be having crashes.. and random program closings..

IS this a real issue? is this poor ram.. is this something else?

Thanks

James

Hawaii Cruiser's picture
Offline
Last seen: 7 years 4 months ago
Joined: Jan 20 2005 - 16:03
Posts: 1433
The B&W does not handle high-

The B&W does not handle high-density RAM. If it works at all, it will only recognize half of the stick (ie. it only uses 128mb of a 256mb stick). Single sided 256 will be high-density.

Not just any SDRAM will work in a Mac, too. Many sticks made for PC's will not work in a B&W.

eeun's picture
Offline
Last seen: 1 year 3 months ago
Joined: Dec 19 2003 - 17:34
Posts: 1895
It is chip density that matte

It is chip density that matters, but chip count or sides used, isn't necessarily determining density (though it can).

I've used double-sided 256MB PC133 in a B&W before with no trouble, but the 512 stick I've got won't work in anything prior to a DA G4, since it's high-density.

There've been a few threads on B&W/early G4 compatibility, and they're picky. Even among low-density chips, they're picky.

Here's a handy reference I found on ebay:

How to tell if your 256MB module is a low or high density module?

* All low density 256MB modules are made with 16 chips (8 chips on each side) using 16Mx8 device.
* Most high density 256MB modules are made with 8 chips (8 chips on one side with the other side blank OR 4 chips on each side) using 32Mx8 device.
* Some high density 256MB modules are made with 8 chips (4 chips on each side) using 16Mx16 device.
* Some even higher density 256MB modules are made with 4 chips (4 chips on one side with the other side blank OR 2 chips on each side) using 32Mx16 device.

Offline
Last seen: 14 years 6 months ago
Joined: Oct 19 2004 - 11:21
Posts: 18
OK, I am confident that the 2

OK, I am confident that the 256mb modules are low density, they were sold by a mac dealer and 16 chip.

It might be quality. I have found a MEMTEST program for mac.. anyone used this? it is supposed to report on the memory and let you know if its compatable with the G3.

I think I am dealing more with a quality and group compatibility issue than any one stick is back or will not work.

I guess its get what I can to work stable.. then look at other ram to replace the ones I can't group in.

Thanks
James

Hawaii Cruiser's picture
Offline
Last seen: 7 years 4 months ago
Joined: Jan 20 2005 - 16:03
Posts: 1433
Don't know about MEMTEST. I a

Don't know about MEMTEST. I always used DIMM First Aid to check SDRAM. It's an OS 9 app and you have to boot into 9 to use it.

Offline
Last seen: 14 years 6 months ago
Joined: Oct 19 2004 - 11:21
Posts: 18
yes that was the one I was th

yes that was the one I was thinking about.. and yes I did use it.. and now things are good.

I think it was more the way the sticks were seating in the sockets than anything else.

James

Log in or register to post comments