Max RAM to reuse an iMac beginning 2009?

I read that RAM can be higher than the max spec from Apple. I can read max is 2x4Gb DDR3 PC3-8500, is this value the limit, or did somebody go higher?

(And, if I can go 16Gb and SSD, which OS version would be best? Big Sur?)

submitted by /u/AGBDesign_es
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