Happy to report this system is now running fine. No overclock of course. Not even XMP.
As for Windows 10, I put in my old Windows 7 CDKEY and it activated my system just fine.
Did some quick testing on this replacement TUF X99. It seems auto voltage really cannot be trusted. Bone stock 128gb ram at 2133, vccsa was 0.98V. Checked out Realbench stress test fine. Manually input ram to 3000, vccsa auto wanted to set itself to 1.36V! Hell freaking no. The moment i saw that in bios i yanked the power cable from wall as fast as I can.
After some tweeking i can get 128gb ram realbench stable with vccsa only at 1.1V and vccio at 1.05V. Cache sits at default speed with 1.02VThe key is do not overclock uncore. Final realbench stress test temp is 65C after 2 hours of stess testing. This is 5930K OC 4.2G core.
Honestly i would probably never touch cache OC ever again.
For now the system seems to work just fine. Thanks everyone for the help! Especially thanks to
@Norton and
@cadaveca
TPU has an awesome community