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Helpful answers
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Jul 5, 2016 9:42 PM in response to Appleboy45by Jeff,You can use PC100 or PC133, but ECC or Registered SDRAM is not supported. A DIMM with ECC capability is easy to identify and avoid — it has an odd number of chips on either side of the PCB. You should buy a pair of 512 MB PC100 (8ns) or PC133 DIMMs (7.5ns or 7ns) CL2 (2-2-2) - although (3-2-2) would be OK. Even though I'd prefer to not use PC133 with a CL3 rating (3-3-3), your 2000 iMac probably wouldn't be noticeably slower.
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Jul 6, 2016 7:53 AM in response to Appleboy45by Allan Jones,I used this in our iMac of the same model without issue:
https://eshop.macsales.com/item/OWC/100SD512328/
That vendor actually takes time to test RAM in Macs, not "guess at" what works. For all PowerMacs of that vintage, the CL2 (2-2-2) RAM always seemed the most compatible.
Running OS9.2 and OS 10.3, ours did not show much improvement going from 512MB to 1GB. The big change was in OS 10.3 when I upgraded from 256MB to 512MB.