Ram upgrade on iMac g3 rev d. Need help!

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Hi!
I was planning on upgrading the ram on my 333 MHz Mac from 32 mb to 96 mb and I know that you have to take off the heat sync and cpu card to change one of the dimms. What I'm wondering is what is the biggest stick I can put in the top slot while the 32 is in the bottom slot under the card. And is the 32 mb the one on the bottom of the card and will the top dimm slot be empty. is the bottom dimm the same size as the top dimm? Also I was wondering if a double height dimm like this will fit on the top slot s-l400 (1).jpg
Thanks!
This is one I was looking at https://www.ebay.ca/itm/Cisco-15-59...213096&hash=item4b09eb6462:g:kCUAAOSwpwRb1skq
Will this ecc memory work?
 
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Your Mac's Specs
Silver M1 iMac 512/16/8/8 macOS 11.6
This is the memory for a 333MHz '5 flavours' iMac. It will take 2 of these modules for a total of 512MB. What ever that memory is it won't work. And this is an iMac as there were several 333MHz G3 towers etc. but one only 333MHz iMac?


https://eshop.macsales.com/item/OWC/100SO256168L/
 
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Your Mac's Specs
M1 Mac Studio, 11" iPad Pro 3rdGen, iPhone 13 ProMax, Watch S7, 2018 15" MBP, AirPods Pro

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