Can Taichi x399 handle a 32GB sized Ram Stick£

I looked all over the internet and I can't find the answer.

I have Taichi x399 motherboard with AMD Threadripper 1950x.

Taichi x399 motherboard supports max of 128GB of Ram.
Taichi x399 motherboard has 8 Dimm slots.
But how big can each ram stick be? Is the max 16GB dimms?

I'm trying to max out the ram to the maximum 128 GB limit. Should I go with 8 sticks of 16 GB each, 8x16=128, or 4 sticks of 32 GB each, 4x32=128.

Thank you so much!

They got back to me, they said no. The maximum sized RAM stick is 16GB for the Taichi x399 regardless of bios updates.

So future readers know. NO you cannot put 32 GB sized RAM sticks in this motherboard. 16GB sized sticks and below only.

looking at bios programing papers for zen 1, there is reserved space for DRAM adress mapping, since 3 bits are there reserved for future, cant you just add it? or it needs support from amd first?

page372https://www.amd.com/system/files/TechDocs/55072_AMD_Family_15h_Models_70h-7Fh_BKDG.pdf

Edited by kerberos_20 - 15 May 2022 at 1:05pm

"They got back to me, they said no. The maximum sized RAM stick is 16GB for the Taichi x399 regardless of bios updates." <- I call BS on that. If that were true, nunya wouldn't be able to see 192GB/256GB.

As for one of the memory channels not behaving, that is a common issue caused by bad contacts between CPU pads and motherboard socket "gold fingers." Obviously, it's more of an issue with LGA (Land-Grid-Array) CPUs like most Intel, ThreadRippers, and Zen4 Ryzens.

I would try re-seating the CPU, and maybe cleaning the CPU pads with something like CRC electronic cleaner.

I would also inspect motherboard socket to see if any "gold fingers" are broken/bent. NEVER touch them, though, unless you know exactly what you're doing.

There are 4094 fingers in TR4 socket! It's amazing the thing even works! I've seen some videos where just re-seating allowed it to work better.

192gb means that 2 of the 32gb sticks are not recognized, a single channel. If you
have smaller capacity modules to try with, see if you get all 4 channels with those.

If it's a dead/intermittent channel (likely need to reseat the CPU) you should
be able to get all 256gb to work. Make sure your retention bolts are evenly tightened.

As for ASRock saying you can't use 32gb
modules, it's likely that they haven't tested enough of them to say yes with
any kind of confidence. In a world where people can sue over anything you have
to be careful what you say in situations like this. Fortunately, that's what
forums like this are for. We can test things ourselves and others can benefit
from the information.