It's no further apart than the ASUS SLI mobo and they have the SLI widget that connects the cards for it.
As to the SLI bridge on the board itself it's quite possible it's done in the bios now since there was talk about implementing mobo's without a physical bridge.
M5A99FX Pro Rev 2.0
Phenom II 955 Black Edition quad core @ 3.5Ghz
2X4 Gigs G Skill F3-14900CL8-4GBXM
EVGA GTX 760
Cooler Master HAF XB EVO,
Some other stuff,
Even more stuff,
If the automobile had followed the same development cycle as the computer, a Rolls-Royce would today cost $100, get a million miles per gallon, and explode once a year, killing everyone inside. --Robert X. Cringely, InfoWorld magazine