Asrock x399 Taichi, XMP and IOMMU

 

Just built a new Threadripper PC (first build in 7 years) and other than 2 issues, system is working and stable. 

 

Issue 1;  Enabling/Auto IOMMU option in bios (1.50) will cause Windows 10 Pro not to boot.  It hangs at the blue Windows logo screen and requires a reboot to get out of.  (Ran into this issue during installation as well.  Bios 1.50 comes with the option set to Auto).

 

Issue 2.  F4-3200C14Q-32GTZR ram (4x8) only boots at 2133 Mhz.  Before purchasing I saw reviews getting their 4x8 -14D ram working at 3200 (2 sets of the F4-3200C14D-16GTZR), so I assumed the 4 dim kit would work as well (my fault for assuming).  RGB works fine (I have no RGB control software installed).  Sticks are installed in A2/B2/C2/D2 slots as per Taichi manual. 

 

I have a small overclock to the CPU (running 3.7, no cooling/temperature issues) and some fan adjustments but no other changes to the bios.  Bios/Win10 see all 32 GB.  Passed several memory diagnostics and stress tests.

 

No XMP profile will work other than 2133.  4 sticks or 2 sticks, will not post at anything other than 2133.  Is their any recourse for this?   Been ages since I have played around with manual timings, so any advice if I should try that?  Bite the bullet and return the sticks to Newegg for some QVL sticks in hopes that they function correctly?

 

Thanks.

 

 

Hit the CMOS to reset the bios, so no overclock, set the timings, and no luck.  Can't get past b0 on Dr Debug.

Wouldn't even boot at XMP 2133 with those timings. 

Took 2 sticks out and tried with just the two in A2/B2 - same results. 

Tried with 1 stick and wouldn't even POST. 

Also, noticed (before this whole thing process started) Windows 10 was hardware reserving 8GB of memory, so I only had 24GB available to me in windows.  Not sure what the culprit is with that.

Ok, next update.  Booted with 3 sticks - D2/C2/A2 - would not boot as 3200 even with the same timings.  Boots as single channel.  Also, hardware reserve uses up 8 gb again.

Put the Ram in D2/C2/B2, boots as single channel and at 3200.  Hardware reserve in windows is back to 120 mb.

Going to try 4 sticks in the A1/B1/C1/D1 and see how that performs.  Otherwise, I believe my motherboard has an issue with the A memory slots and will most likely need to be RMA'd as the memory works well.

well to be fair

the ram is 'ryzen friendly'
alas experiance with threadripper isnt my forte

did you raise the dram and soc volts also ?


Edited by datonyb - 21 Sep 2017 at 4:51am

datonyb wrote: well to be fair the ram is 'ryzen friendly' alas experiance with threadripper isnt my forte did you raise the dram and soc volts also ?

Rope wrote: Nope.  All I did was just enable the xmp3200 profile and change the timings.  Will try going back to just D2/C2 and simply select the xmp profile and see if that works without changing the timings.  Yea, D2/C2 just select XMP3200 and booted up no issue.  Definitely leaning towards it being an issue with the motherboard.  Oh well, Newegg made the RMA relatively easy, so we'll see how it goes.

Sorry but raising the SOC voltage as datonyb suggested, is a standard Ryzen memory over clocking procedure. Just as on Intel systems, increasing the VCCSA and VCCIO voltages for memory over clocking is required. SOC voltage will not be increased automatically via an XMP profile.

You may have had a problem with your X399 Taichi board, fine. But if the X399 system is anything like Ryzen/X370, you will need to increase the SOC voltage when you over clock your memory.

The stock/default SOC voltage on standard Ryzen boards is 0.900V. Normally setting SOC voltage to 1.100V will be necessary for a memory OC. Note that the SOC voltage has an LLC setting, as well as a voltage mode, such as Fixed or Offset. That indicates how important it is. We have yet to learn how much is needed for X399/Threadripper, but going with what works for Ryzen makes sense.

DRAM voltage at 1.35V should be done automatically with the XMP profile. If it isn't, then it must be done manually, unless your memory is rated to operate at say 3200 with 1.2V.