iMac 15,1 - Changing the serial number's last 2 digits changes CPU generation?

So I noticed something interesting some time ago and thought I'd mention it to get your guys' opinion on it.

When setting up the system definitions in Clover, and generally within context of S/N generation, when issuing IDs for the iMac 15,1 definition, I always see the S/N ending with the number 10.

C02NVHZCFY10

I took this serial number from the vanilla guide on here (don't use it btw, probably many people have already lol) which generates a S/N and an MLB value through macserial - a really cool tool built by acidanthera. If you input this in https://everymac.com/ultimate-mac-lookup/ which is the classic search tool for a valid serial number, it returns a Haswell iMac, which fair enough that makes sense.

However changing the serial's last 2 digits from 10 to 11 returns a Haswell Refresh/Devil's Canyon iMac!

Is this common knowledge? I was wondering if it improves performance if one has a Haswell Refresh chip? I thought that the system definition (15,1 - 14,2 etc.) was the limit to optimising the match between the software and hardware?

Thoughts?

submitted by /u/iBifteki
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