Questions
Q1
Will TZ77XE4 be able to support 3 way SLI?

TZ77XE4's 3rd PCI-E slot will run at 4X speed due to chipset support limit.

However, SLI require at least 8X for PCI-E for each slot.
So it will only support 1st and 2nd PCI-E slot for SLI function.