And so it begins... First AMD Ryzen AM4 server motherboard.

Notice: Page may contain affiliate links for which we may earn a small commission through services like Amazon Affiliates or Skimlinks.

zir_blazer

Active Member
Dec 5, 2016
351
126
43
Interesting, they added a RDIMM to the QVL. Is RDIMM even supported on TR? AFAIK it's not.

It seems to me that ASRock Rack is really having difficulty getting an appreciable quantity of their new boards into the channel :\
I don't know if AMD restricts RDIMM in some way at the Processor level (After all, AMD use the same die across consumer Ryzen, HEDT ThreadRipper and enterprise EPYC, so all Zeppelin dies must supports it), but RDIMM itself needs some special wiring on the Motherboard since on a RDIMM all the Control Bus signals are supposed to talk to the Buffer chip instead of directly to the DRAM chips. If someone bothered to create a hybrid UDIMM/RDIMM layout for ThreadRipper (Like those used by Xeons E5, which worked with either RAM types) and figured out it works, it would be interesing.
 
  • Like
Reactions: Hydrogen_Bombaklot

elag

Member
Dec 1, 2018
79
14
8
Couple more minor points;
  • Yesterday's power measurements were taken with an old 650W PSU I had laying around (which I retired from my workstation for a lower-power and more efficient model); today I took readings with one of my usual high-efficiency PSUs, a Seasonic SS-350M1U (80+ Gold). Power at idle has dropped considerably - even though I've made no power tweaks, and I've added the extra DIMM, power usage at idle is a pretty damned impressive 23W. Just goes to show what a difference an overpowered PSU can make to your efficiency ratings*.
One more question: I noticed that all fan connectors are 4-pins. My case has a number of 3-pin fans. Will the X470D4U control the fans with DC if I connect 3-pin fans or will I have to replace the fans with 4-pin versions?
 

EffrafaxOfWug

Radioactive Member
Feb 12, 2015
1,394
511
113
I don't have any 3-pin fans to test with, but the PWM connector was meant to be designed with backwards compatibility in mind - but without PWM I don't think there's any way for the BIOS to control the fan speed is there?

In a 3-pin fan setup, the first two pins provide the power and ground and the third provides the tach; 4-pin just provides an extra pin with PWM for the duty cycle. Fan controllers in days gone by had to use voltage manipulation for 3-pin fans, it's only with PWM that you get the granular control without having to use extra hardware, and I'm not sure I've ever used a motherboard that featured voltage control for 3-pin fans. But then I don't think I've used 3-pin fans for getting on for a decade.
 

elag

Member
Dec 1, 2018
79
14
8
One more question: I noticed that all fan connectors are 4-pins. My case has a number of 3-pin fans. Will the X470D4U control the fans with DC if I connect 3-pin fans or will I have to replace the fans with 4-pin versions?
For an in-depth description of 3 vs 4 pin fans see: Case Fans- 4pin, 3pin, molex . 3-pin fans often work correctly on 4-pin connectors, hence my question on support on this motherboard.

According to ASRock X470D4U first impressions. AM4 server motherboard : Amd 3-pin fans just work fine.

Now if I could find out if there will be a way in the future to add a controller that supports 2 or even better 4 U.2 disks.... Bifurcation is supported, but I cannot find of a PCIE to a set of Oculink or SFF connectors card exists that support U.2 disks....
 

MrFlppy

Member
Jun 11, 2016
41
1
8
38
Hi guys,

Since I'd like to switch to Zen 2 for future builds I also started circling around the X470D4U since as you know the feature set is unique for the AM4 platform at this point.

I had been burned in the past regarding firmware issues so I searched online for what "might be wrong" at this point in time with the ASRock Rack X470D4U.

I hope I'm not breaking any forum rules by mentioning another forum, but there seems to be a quite lively thread in the forum of Level1 Techs (also a YouTube channel with interesting niche content) where a few users found various bugs:

- CPU fan speed control is broken in latest public BIOS 3.04 (locked at BIOS default RPM, no matter how hot the CPU actually gets), fixed in 3.09, currently 3.11 seems to be the latest unreleased BIOS version that breaks something regarding DIMM sensors.

- For some unkown reason the X470D4U seems to not like Seasonic PSUs, activating "CPU_PROCHOT", locking the CPU at 550 MHz even if CPU temperature is in the range of 30-40°C. Even with a factory-new "flagship" SSR-850TR PSU.

Source:
ASRock Rack has created the first AM4 socket server board

Do the ones of you that already deployed the board have had similar experiences?

Could ServeTheHome maybe cooperate with Level1 Techs to investigate?
 

EffrafaxOfWug

Radioactive Member
Feb 12, 2015
1,394
511
113
If you look at my posts a few pages back you can see my setup; I've observed the bug with the CPU fan not ramping up when the processor is under load, from my experiences most of the sensors aren't working properly in 3.04.

I'm running with a seasonic PSU (albeit the FlexATX SS350-M1U) and I've not had any issues with PROCHOT being asserted, but from the thread the assert only happens when windows boots so it might be OS related, but it's not easy to call without more detailed info. At a guess I'd say it's a weird interaction between a quick of that particular PSU and an immature BIOS.
 
Last edited:
  • Like
Reactions: MrFlppy

MrFlppy

Member
Jun 11, 2016
41
1
8
38
Thanks for replying so quickly!

At least ESXi seems to also be vulnerable to CPU_PROCHOT so Windows doesn't seem to be the culprit here.

Hope that ASRock Rack is getting their sh** together and that there is no Intel mole in their BIOS software engineering team ;)
 

EffrafaxOfWug

Radioactive Member
Feb 12, 2015
1,394
511
113
I'm sure to be met with howls of derision from people who've had the opposite experience, but IMHO I've found ASRock to make the most reliable BIOSes as far as their consumer kit goes, and their support are very linux-friendly.

Their X470D4U is a rather niche product that's doing a lot of stuff that never been done before (most pertinently mating a standard X470 setup with a BMC) so I was expecting there'd be issues in reports of the hardware sensors. Throw in a brand new CPU range and things get even more complicated. I've every faith they'll get the serious bugs sorted soon enough.

From reading through the thread you linked, there's a couple of beta BIOSes doing the rounds, v3.09 to fix most of the sensors issues and v3.11 to not-quite-fix the PROCHOT assert with certain PSUs so it sounds like a new production BIOS will be dropping shortly.
 

MrFlppy

Member
Jun 11, 2016
41
1
8
38
ASRock (non-Rack) is also one of my preferred manufacturers for desktop builds right now.

Ryzen 3000 does not seem to be the cause of CPU_PROCHOT, if I read that Level1 Forum thread correctly initially it started with a 2700X, then a 2600X (with pre-Zen 2 BIOS 1.50) and finally continues on with 3700Xs.

I'm a bit flabbergasted how an issue like CPU fan speed not reacting to rising CPU temperatures could pass ASRock Rack's BIOS QA procedures (BIOS 3.04 that is still public).
 

EffrafaxOfWug

Radioactive Member
Feb 12, 2015
1,394
511
113
I'm pretty sure the objective was to get out a BIOS that supported Ryzen 3000 as soon as possible and then to fix the ancillary issues later. Hopefully v3.20 or whatever it ends up being called will be production ready. A note on the page pegging 3.04 as beta status would have saved a lot of the aggro in this regard I think.

PROCHOT issues have been around for ages for all sorts of different reasons; in the case of the ryzen CPUs I've seen multiple reports of it limiting performance on certain boards, sometimes legitimately, other times not. But I've never run in to the issues myself so I've never really dug in to the technicalities, but certainly having chip sensors that seemingly aren't working/reporting correctly to the MB isn't going to help.
 

trott90

New Member
Jan 27, 2018
13
0
1
48
ok, I got my X470D4U2-2T last week, today I start to build it with 3700x. I update Bios to 3.02 using IPMI, but system do not post at all with only CPU and Ram, even the dr.debug led is not lighting, I don't know how to debug it, any suggestion on how to debug it/
 

trott90

New Member
Jan 27, 2018
13
0
1
48
@EffrafaxOfWug, is your debug LED lighting up when you connect the power(no need to power on), my seller said the debug should be lighting up when PSU is connected to the power, it shoud be the PSU issue if debug LED not lighting up
 

EffrafaxOfWug

Radioactive Member
Feb 12, 2015
1,394
511
113
I'm not sure what you mean by debug LED; when the power is connected, even if there's no CPU and memory installed, the following should happen:
SB_PWR1 (right underneath the 24-pin ATX connector) should light up solid green
BMC_LED1 (right next to the ASPEED 2500 chip) should blink green to indicate the BMC has booted and is functioning correctly

The seven-segment display doesn't actually light up until you power the board on as it's only there to show POST codes.
 

EffrafaxOfWug

Radioactive Member
Feb 12, 2015
1,394
511
113
BIOS 3.10 and BMC 1.60 just landed on the website... I'll get them updated, have a fiddle and report back on any differences.
 

trott90

New Member
Jan 27, 2018
13
0
1
48
BIOS 3.10 and BMC 1.60 just landed on the website... I'll get them updated, have a fiddle and report back on any differences.
@EffrafaxOfWug, after I clear the CMOS, I can get my system post now; asrock support also give me 3.11 bios of my 2T version, sensors in IPMI seems working now, but my 3700x idle at 51c with vCPU at 1.47v, it seems too high for me, how about yours? any setting you have changed in Bios?