Which SDRAM upgrade for my old imac?

I'd like to upgrade my imac sdram to as much as it can hold. Here are the specs:
Imac version = 22.14
Mem 348 MB
Proc. 500 MHZ PowerPC G3
I think it is 1983-2003
I have one stick at 256 SDRAM and one is the one that came with it. I've had one store tell me I need PC100 and others tell me pC133 and I'm all confused!
So my questions: what is the exact type I need and how far up can I go? Is it only two 256 sticks(cards).... thankx yvonne

http://docs.info.apple.com/article.html?artnum=58007
It can hold a maximum of 2 X PC100, 3.3V, 168-pin DIMM 512MB modules. Note it must be non-eec.
If your 500 Mhz model has a CD+RW drive (A 2001 model) then according to the Apple specs it will also take (low density) PC133 RAM. The RAM will slow down to PC100 speeds though.
I'm not sure if PC133 will work on the non-2001 iMac slot loaders as I've only tried PC133 RAM on the models Apple support it with (works fine).
If you want sure support just go PC100.

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