I get what you're saying, but I still can't find any source for 44mm - and how do you know the backplate is 4.2mm or that the metal plate is 40mm?
Based on what Dan said:
I'm a bit confused.
@Nichronos you're info doesn't match what's stated by EVGA in the link above. It looks like all variants will fit - I'd hope that Dan knows his stuff :P