Author Topic: threadripper 1950x issue while rendering  (Read 5972 times)

2019-07-18, 12:19:14
Reply #15

micmac

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Hello Joe,
thx for answering.
Juraj, can u confirm this? Is it possible to have black screen due to a overheat? When it crash processor (2990wx) is at 68C° (coretemp software).
Best,
Damien

2019-07-19, 16:23:07
Reply #16

Juraj Talcik

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Hello Jozu,
Do u find out the problem with black screen?
I have the same error... after 15 minutes of rendering, screen turn black and i have to reset the computer...

my spec are:
_AMD 2990WX
_MSI X399 SLI PLUS
_G.skill aegis DDR4 8x16 GB 3000Mhz CAS 16
_Corsair hydro series H80i V2

Yeah the problem is this whole build. There is one medium and one huge problem.

Small: X399 SLI PLUS. This is not a board for 2990WX due to insufficient VRM. Important thing with VRM is that it accounts for CPU and Memory. 250W CPU is already super hungry, but 8x16GB 3000 & C16 is equally so, that puts tremendous stress on the memory controller.
There is reason why MSI MEG has 19 phases (16 for CPU and 3 for Memory).

Yeah some people use poor boards for 2990WX as long as you have very good case airflow but I don't think those people run 128GB& 3000& CL16 memory.

The biggest problem: H80 V2. Not only is this tiny cooler that cannot cool 250W of heat, it doesn't even cover the Threadripper heatsink. There is only one rule to follow with TR4 platform, and that is to buy dedicated TR4 coolers.  I.e Noctua UH14-S or Enermax Liqtech 360 II TR4.

Buy MSI MEG or ASUS ZENITH ALPHA and either UH14-S or Liqtech 360 II.
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2019-07-23, 11:53:51
Reply #17

micmac

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Thx Juraj for answering!
best,
Damien

2019-07-23, 12:24:27
Reply #18

polysmooth

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Hello everyone,

We had the same problem at the company with 2 threadripper 2990WX. black screen, forced to unplug the computer to restart it

A machine with a motherboard: ASUS® ROG STRIX X399-E

A machine with a motherboard: ASUS® PRIME X399-A

there is exactly the same problem with the two motherboards.

the 2 computers are with Noctua NH-U14S TR4-SP3 and  Corsair VENGEANCE DDR4 2400 MHz (4 x 16 Go)

We have solved the problem by modifying the parameters of the ram in the bios of the motherboard.

Here is the link of the tutorial.

My big disappointment with the threadripper is that the cinebench score is good but the rendering with corona is not as fast as with my bixon 2698 V4 ES

bi xeon 2698 V4 ES cinebench: 4200
threadripper 2990WX cinebench: 5000

bi xeon complex corona scene: 1 hour
threadripper 2990WX complex corona scene: 1h50min!

I do not understand where this problem comes from but I find the performance of the threadrippers very random.

2019-07-23, 15:38:07
Reply #19

Juraj Talcik

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You definitely shouldn't need to modify voltage of memory for 2990WX for it to work. But it's good to have motherboard that has enough VRM capacity for both CPU and Memory controller. MSI MEG has 16 phases for CPU, 3 phases for memory controller.

STRIX and Prime have 8 phases for both (together and they're not exactly big mosfets), they're not motherboards for 2990WX. Nothing to even ponder there.

To get full performance out of 2990WX, you definitely need 2993 MHz memory with fast timing (CL14-16), that's the highest speed 8x16GB modules will run. People with 4x16GB (or 8x8) might be able to get even 3200 MHz stable, but I wouldn't trust it for rendering.
We also use 2698v4 ES Xeon nodes, and the 2990WX does beat it, but yes, not by drastic measure.  Corona is super memory bandwidth dependent and Intel still scores higher there.

Cinebench R20 illustrates this better than R15.

Corona Benchmark for 2x2698v4 ES = 42 seconds
Corona Benchmark for 2990WX @ Stock 3.4 GHz all-core boost @ 2993 MHz memory = 38 seconds
@ Stock 3.4 GHz all-core boost & 2133 MHz memory = 52 seconds (!!)

(Just for comparison, my i9 7980XE 18core @ 4.0 GHz @ 3000 MHz memory is 48 seconds)

The benchmark is not best with the way it starts and does precomp, it is absolutely not linear and it doesn't account for the fact the full Corona will offset AVX clocks.
So 2698v4 ES will run at lower frequency.

So your issue is memory (and motherboard). But current generation Threadripper has definite limitations when it comes to Corona. Let's see what Zen2 Threadrippers (2019 Q4/2020 Q1) will do with the changed architecture.
There are AMD performance profilers for the devs, but I am not sure if there is something they can do.
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