[hankey]

I've upgraded my 600 mhz G3 iMac to system 10.2.8 but since I only have the basic 128 MB of RAM I'd really like to add to to it. Are SDRam DIMMs and DIMMs the same?
I have access to an old Beige G3 that has...
128 DIMM (1)
256 DIMM (2)
I know I need SDRam but the system profiler on the beige only says DIMM. Is there a way to find out more info on this memory? Or am I just wishing on a starand they're just not compatible?
What I'd really like to do is add one 512 to the iMac for 640 RAM. But if I can use the two 256 DIMMs I'd save the expence.
Any help would be appreciated.

[Hatter]

DIMM First Aid will tell you some.
Have you tried looking up the RAM specs for the iMac at various sites? www.everymac.com or... www.apple.com/support -

[url=http://www.everymac.com/systems/apple/imac/stats/imac600graphite.html] Graphite iMac G3/600 [url] @ Everymac.

[Peter Cohen]

In reply to:

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Or am I just wishing on a starand they're just not compatible?

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The Power Mac G3 beige systems, if I remember correctly, used 168 pin 3.3v PC-66 SDRAM DIMMs. And if memory serves, the iMac G3 slot-loading systems of your particular vintage's called for 168 pin 3.3v PC-100 SDRAM DIMMs. While the DIMMs are physically compatible with the slots in your iMac, Apple does not generally recommend using slower memory in systems that call for faster memory.

[Hatter]

I don't think there are ANY 256MB PC66, only PC100/133, and most people when they upgrade a Beige either buy PC100 or some PC133 which is programmed to be backward compatible.
Crucial iMac G3/600 - I always check and use Crucial Memory Selection first. So PC100 will work, but with only two RAM slots, you want CT260477 512MB which only comes in PC133.

[MacCheetah3]

Hi
The beige G3 and slot load iMacs do not use the same type of memory. The iMacs use a much more condensed version. Yes, 3.3v, 168-pin PC100...Should work in both but the iMac uses 32x8 configured sticks while the beige G3s use the older 16x8 configured chips.
MacCheetah3
Apple PowerBook G4 Titanium 1GHz, 1GB, 60GB, SuperDrive, Airport, Mac OS X, 20GB iPod (4G)
Debug Computer Services http://www.click2debug.com

[hankey]

Thanks for all the help. As near as I can tell the beige uses:
10ns 168 pin SDRam
while the imac is:
8ns PC100 SDRam.
I think I'll just go ahead and buy at least one 512 for the iMac.
One question that comes to mind though. If I bought two 512's, is there a preferred way to install them? Would I pull the installed 128 and put in both 512's or should you install a 512 and restart with 640 then shut down and remove the 128 and add the next 512? Just wondering if there was a protocol to something like this.
The last time I upgraded memory it was VRam from 1MB to 4MB in a motorola 166 (seemed like a good machine at the time)
Thanks again.

[MacCheetah3]

Hi
Originally posted by hankey

In reply to:

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One question that comes to mind though. If I bought two 512's, is there a preferred way to install them? Would I pull the installed 128 and put in both 512's or should you install a 512 and restart with 640 then shut down and remove the 128 and add the next 512? Just wondering if there was a protocol to something like this.

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You shouldn't have to. The only reason I would think to do that is to test each chip individually for immediate problems. Otherwise, no need to go one-by-one.
MacCheetah3
Apple PowerBook G4 Titanium 1GHz, 1GB, 60GB, SuperDrive, Airport, Mac OS X, 20GB iPod (4G)
Debug Computer Services http://www.click2debug.com