Question Maybe I found a serious bug in Cinebench R20???

[marcUK2]

Hi,

Just got myself a 3950x and thought I would do some overclocking/underclocking...For a minute I thought I was going mad, but then I realized this might be a big bug, so perhaps someone else can verify?

Everything is stock at the moment, using Ryzen Master I activated the creator mode, but changed nothing, Cinebench R20 gives me a score of ~9000

Power is ~140W, each core using around ~7W, with the rest going to the IO Die I assume. The all core speed during CB20 is about 3950Mhz

Now, If I go to Profile1, which is in a default state, but click on PBO, and set PPT, TDC, and EDC to their minumum values, 71,47,70....
Power is no down to ~70W, cores at ~3W, and the all core speed is barely over 2100Mhz..

But CB20 gives me repeated scores in this configuration of ~8500.

Which surly cannot be correct.

I timed the runs. In creator mode it is 37s, and in the custom low power mode it is 58s..

Can anyone replicate this??

 

[lightmanek]

So I decided to enable the XMP 3200 profile for my memory, which gives me
View attachment 18941
Im not fiddling with timings, because I dont really know what they do, and I dont really have time myself.
However my CB20 score did not improve at all, but the system seems OK, so I will leave it as is.

Incidently, disabling all the crap that loads at startup (GFExperience, AutoDesk Utility, UE Launcher etc...) gives me an extra 150-200CB, so I am well into the high 9000's now, so I assume that this is as good as its going to get with this MB combo. Its a considerable step up from my 3700X.

I will try to pick up another 2x16GB kit when I see my set on offer, but I cant quite get by on 32GB at the moment

Cinebench is not that memory speed sensitive, you would see some improvement in CB15 OpenGL test or any gaming tests.

 

[HutchinsonJC]

Best RAM options are going to be something between 3600 and 3800MHz with as low of a CAS latency as possible. You definitely want that 1:1 IF to RAM ratio.

I took this kit on Amazon to 3666MHz by bumping voltage to 1.385v. I've had no problems with it.

Other options may be out there that are better.

G.Skill Trident Z Neo Series 32GB (2 x 16GB) 288-Pin SDRAM PC4-28800 DDR4 3600MHz CL16-19-19-39 1.35V Desktop Memory Model F4-3600C16D-32GTZNC