Editting fan speed in bios (unique S/N important?)

Hello,
I was looking at the closed thread concerning requests to modify their twin frozr gtx 560 bios to the requested fan speed. I saw that Svet might release a program so that we can edit the bios ourselves.  I am wondering why the serial number of the card is requested? Is there a unique serial number check? If not, couldn't someone with the bios modded to 30% fan speed just share his bios rom?
Thank you.

Different cards have different firmware, that is why he needs the serial.
To name something, it matters what memory-chips are on the card, as such it will have a different firmware, where the model-number is the same.

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