Technically, what is "SLI Ready"?

[Bigrustydad]

I'm trying to neck down the specifics as to what a MoBo manufacturer needs to do in order to design an SLI Ready motherboard. Why, for instance, Can't I use an SLI bridge across a pair of GTX 770s on a supermicro X9DRG-QF motherboard (LGA 2011, E5-2600 V1 or V2, C602 chipset - plenty of space between PCIex16 sockets, plenty of power, plenty of cooling - but NOT "SLI Ready" - why not? What's missing?)

 

[renz496]

what's missing? Royalty needed to be paid to nvidia to get "SLI Certified" badge. AMD CrossFire is free. that's why even some low end board have CF support. it was that simply really. just some kind of BIOS check from nvidia driver. that's why there are program able to make non-SLI certified mobo work with SLI by 'tricking' nvidia driver thinking the board have SLI cert.