I'm using a X99 board with i7-5960X
Wondering if the expansion cards below do supports RAID-0 with 4 pcs intel 660P 2TB QLC NVMe on x99 boards:
Or it is only work on X299 and X399 boards only?
I do not believe that you will be able to do this; I believe that, in general, support for RAID 0/1 is limited to two NVMe drives. You really need to be asking Asus this question; the answer is going to depend upon the PCIe routing and NVMe remapping capabilities offered in their BIOS.