Hi, thanks for the info. Its very helpful. I'll do some more research.
David
Yes, you can do it, with 8/8/8/4. 3-way SLI is supported. These charts will help you:
http://uk.hardware.info/reviews/566...tested-pci-express-lanes-for-sli-en-crossfire
"
Gigabyte chose to connect the M.2-slot through two PCI-Express 2.0 lanes from the X99 chipset: so a maximum throughput of 1 GB/sex. The marketing department has indentified the slot as 10 Gigabit/sec (which is factually correct due to the 8/10-coding), presumably to make it sound faster.
However be aware that fast M.2 SSDs like the Samsung XP941 and the soon to be introduced SandForce SF-3700 models will not be able to work at full speeds on these slots. Another disadvantage of this solution is that the M.2 slot can not be used in conjunction with the first SATA Express connector or SATA port 5 and 6. Gigabyte call their solution "dual M.2", but this is more of a marketing thing. All Gigabyte boards feature two M.2 slots, but the second slot can only use a maximum of one PCI-Express lane, so not suitable for a hard drive. On the more high ends boards this slot is used for a M.2 WiFi module, something that it is suitable for. The only exeption to this is the Gigabyte XZ99-SOC Force, as this has what Gigabyte call a "Turbo M.2" slot, connected to four PCI-Express 2.0 lanes on the chipset. This is a slightly better solution but still not on par with the competition, as they implemented M.2 slots with four PCI-Express 3.0 lanes."
http://uk.hardware.info/reviews/560...well-e-storage-m2-and-sata-express-are-common
As long as you use the M.2 for WiFi, instead of an M.2 SSD, you'll be fine.