I have 2x32gb sticks of M393A4K40BB1 and i havent had any issues, given its 2400for the fastest supported mem speed with my 2680v4's.I just setup my X10DRU-i+ (my first ever Supermicro) with a E5-2640 V4 and some Micron DDR4-2133 MTA36ASF2G72PZ-2G1A2 memory. For some reason the memory throws an error at start up about 60% of the time. I have two sticks and they both have the same issue. I'm not sure what's going on.
Did you load them in the right slots based on your stick count? Did you try with less sticks? Memtest OK? What exactly is the error?