AMD threadripper 2990WX vs 3970x

[mzex]

Hi!

I have recently bought AMD Threadripper 3970x and tried to compare rendering times with my 2990wx config.

 

So configurations are:

 

1.

CPU: AMD threadripper 2990wx

COOLING: Coolermaster masterliquid ML360 TR4 edition

MOB: Gigabyte x399 Aorus pro

RAM: 64Gb Corsair Vengeance LPX DDR4

GPU: ZOTAC AMP! Extreme 1070 8 Gb

DISK: WD SN750 m.2 500 Gb

PSU: EVGA supernova 750 G3 750 W

 

2.

CPU: AMD threadripper 3970x

COOLING: Coolermaster masterliquid ML360

MBO: Asus ROG STRIX TRX40-E gaming

RAM: 64Gb Corsair Vengeance LPX DDR4

GPU: ZOTAC AMP! Extreme 1070 8 Gb

DISK: ADATA SX8200 Pro 512 Gb

PSU: Thermatake Toughpower Grand RGB 850W Gold

 

 

Test scene was archexteriors 34 scene 10. Render was started out-of-the-box. No tweaking.

 

2990WX rendered it in 61 mins, while 3970x finished it in 19 mins.

 

As far as I know 3970x is not 3x faster than 2990wx.

I think that something is not OK with my 2990wx.

Does anyone has experience with 2990wx?

What could be wrong with 2990wx config?

[Nikolaos M]

Try to run the test again and see via a monitoring software (HWinfo etc) if all the cores of the 2990WX are running at 100%. Also, you didn't mention the RAM's frequencies. RAM speed is very important, especially for the previous Threadrippers.

Furthermore, try to run classic cpu benchmarks and see if the problem insists, ex. run Cinebench, Vray benchmark and Corona benchmark to see if the scaling is as expected.

[mzex]

Problem was in memory disposition.

I had 128 Gb of memory in first config. After I got 3970 x I took out 64GB and put it into new config.

Remaining RAM modules were put in first four slots. So only two channels were used. Memory clocks were set to default / auto.

In previous configs setting to auto meant that would work at declared clocks, but in both AMD configs that meant clocks were set to 2133 MHz even tough memory was 3000 GHz.

 

After I put modules one to each four channels and clock was set to 3000 GHz my vray benchmark result was 27000 and mentioned scene render time was 35 mins.

Which is huge difference compared to first result but difference is still 1,6 x (vray benchmark) and 1,8-1,9x (evermotion scene) slower compared to 3970x.

[mzex]

new interesting observation.

 

The other day 2990wx config rendered evermotion scene in 35 mins.

 

Today with no change in BIOS (CPU clock and RAM clocks are the same) it took 27 mins for the same scene with same settings.

 

Only thing that was different I have restarted comp just before rendering. This is 20% faster.