If you had looked at any post at all about the X98 Plus’s hardware here on the forum, you’d have seen that yes, the RAM is only running in 1066 MHz even though it’s 1600 MHz modules. It’s locked in the BIOS, and since the BIOS is locked down… Nothing we can do.
Someone might have an idea somewhere. Search this forum, XDA and that Russian forum I forgot the name of(It’s mentioned in many threads here).
Also camera for the a5c8 model came with 5mp, but all other models came with 2mp cameras. Sometimes vendors just slam the old description in the store page.