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cvzyl 03-24-2007 02:36 PM

OS X on G3 iMac

I recently got a 400MHz slot loading iMac G3 from a friend. I have set it up for my 4 year old daughter. It runs OS 9 but ideally I would like to install OS X. Unfortunately it only has 128 Mb RAM. I see that it takes SDRAM and as I have plenty PC SDRAM lying around, I was wondering if I could use it in the iMac? What is the specs of the SDRAM used in the iMac?

Any assistance and helpful comments will be greatly appreciated.


Brown Study 03-24-2007 03:05 PM

A company selling RAM has this listing for an iMac G3: 168-pin PC100 SCRAM DIMM, but I hauled up only that one page. I doubt it would be wrong, though.

cvzyl 03-24-2007 03:29 PM

Thanks for the info. I have two 512Mb 168 pin PC133 SDRAM DIMM's lying around, do you think it will work? I assume it will just operate at PC100.

Any chance of damaging something?


Brown Study 03-24-2007 04:59 PM


Originally Posted by cvzyl (Post 356083)
Any chance of damaging something?

I'm the wrong person to ask. Maybe someone else with the knowledge will post an answer. Or the web might have the info. Try a search for imac g3 ram requirements.

Miffle 03-25-2007 07:26 AM

If it helps here is the ram in my imac G3:


Size: 256 MB
Speed: PC133-333



Size: 256 MB
Speed: PC100-322S

Both these collected from system profiler

PC100 SDRAM (3.3 V, 64-bit, 168-pin, 100 MHz) according to lowendmac

So the same as Brown Study

I run a 450MHZ, 512 RAM in panther 3.9

It will do fine for stuff like word and excell if you ever have to use it but if you are visiting educational sites with your daughter, playing their flash games and so on it may start to crawl.

I know this one doesn't streaming video at all. It can really start to stutter

Nice gift for your daughter though! They are fun little things, theres always OS 9 games, eh?

One thing if your imac has it, at the bottom kind of hidden under a vent/grill you'll find a VGA out. If you need to use it this is great, or if your daughter starts to complain its too small (Do four yearolds go so deep into technology? I don't know!) mine is currently hooked up to a 21inch CRT (on it now)

Good luck

Eif 03-25-2007 08:44 AM

just a thought, does your mac have a dvd drive? i just bought a g3 imac, and picked up os x on ebay, but am having to buy an external dvd drive to install the software, as the mac has a cd rom.

MacHeadCase 03-25-2007 09:12 AM

Welcome to Mac-Forums, Eif!

You can get Tiger on CD from Apple. They will charge you 9 or 10$ for it but it is possible to get it in CD form, much less expensive than buying an external DVD. :girl:

Miffle 03-25-2007 09:38 AM

Its up to you but you could always get panther? It works great - so does tiger but some features (Not including dashboard because it can easily be turned off) can really hold back a 400MHZ

panther comes on CD but you'd be buying from somewhere like ebay

Mine has a DVD drive, I think i'm wrong but only the DV models had DVD drives?

External DVD drives can be expensive but a good investment if you need the write features (Yet another strain on the CPU and the speed of firewire or USB)

Eif 03-25-2007 09:40 AM


Originally Posted by MacHeadCase (Post 356432)
Welcome to Mac-Forums, Eif!

You can get Tiger on CD from Apple. They will charge you 9 or 10$ for it but it is possible to get it in CD form, much less expensive than buying an external DVD. :girl:

Hello..thanks for the welcome :) i will have a look into that, i have os x panther 10.3.5, so not sure if they would upgrade it to tiger, worth checking out though, thanks :)

MacHeadCase 03-25-2007 09:51 AM

Going with Tiger is a whole new OS so you won't have an upgrade pricing. You can always look on eBay if you are looking for a bargain. Just make sure you buy it on CD.

But Miffle does have a point. Panther was rock solid and is less demanding on hardware than Tiger is. There will be Tiger-only features that will not render on your machine because your graphics card is not supported. If you update Panther to version 10.3.9, you get a lot the benefits of having Tiger.

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