lol, I wouldn't worry about the WEI. By setting, are you asking if there is a hack, or are you saying you asking what parts you need to get 7.9?
I have 7.9 on everything except Processor. That's 7.8 and with a firstname.lastname@example.orgGHZ. so maybe you need an SR2 motherboard with dual xeon 5680s or something crazy like that to get 7.9. I have 3x580s, a C300 256GB for primary HD to give you an idea of what will give you 7.9.