Thanks all for the input - given that RAM is the only upgrade path open to me on this particular iMac, and as I'm running on close to bare minimum as is (8Gb), I've ordered 128Gb (4x32Gb) to max out this computer.
I'll post before and after PI benchmark when the chips arrive and are installed to see if it'll make any difference on this 2020 iMac
Cheers
Doug
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