It support, u should get the tx750m
As far i know, most 750watt psu support 2 way sli
Probably someone will come here and tell u more if it a wrong discription or buy additional cable or what
Before people bash u, told us if this rig for game or editing?
And it not a good thing to sli 7850, u should probably get a faster single card.
Both.. plan to be gaming and use it for aftereffects/photoshop... which is why I decided on the i7. Why do you say 7850 on crossfire is a bad idea ?