PEI--Intel MRC Execution...

[RolloZ170]

here is another one with same issue than yours.
page115
5. Memory based on 16 Gb dual rank technology (including maximum memory configuration of 256GB) is supported by silicon but not validated on Intel platforms.

https://forums.servethehome.com/index.php?threads/256gb-on-supermicro-a2sdi-h-tf.26975/

 

[AlphaInc.]

I've also tested with 16GB KVR21R150/16 and it went past POST.
I'm now trying to update bios

 

[AlphaInc.]

here is another one with same issue than yours.
page115
5. Memory based on 16 Gb dual rank technology (including maximum memory configuration of 256GB) is supported by silicon but not validated on Intel platforms.

https://forums.servethehome.com/index.php?threads/256gb-on-supermicro-a2sdi-h-tf.26975/

TL;DR So that means I can't make it run since my Intel CPU won't support it?

 

[RolloZ170]

I've also tested with 16GB KVR21R150/16 and it went past POST.

unknown RAM (google) but even single Ranked it works.

TL;DR So that means I can't make it run since my Intel CPU won't support it?

you need that MEM-DR464MC-ER29
and even with this you will have issues. so sorry, i was correct at first, that won't work for you !

 

[RolloZ170]

since my Intel CPU won't support it?

supported by silicon but not validated on Intel platforms
for that reason the BIOS programmer does not know how...

 

[RolloZ170]

found another 64GB 2S2Rx4 (4Rx4) RDIMM (not LRDIMM)
HMAA8GR7A2RN-VN
so 256GB is possible, but with very rare modules.