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2700x Performance in PBO (Precision Boost Overdrive) only

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post #1 of 77 (permalink) Old 01-02-2019, 05:18 AM - Thread Starter
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2700x Performance in PBO (Precision Boost Overdrive) only

I recently got myself an Ryzen 2700x system which looks a bit like this:
  • Ryzen 2700x
  • Noctua NH-D15 SE-AM4 Cooler
  • X470 GAMING M7 AC
  • F4-3200C14D-32GTZ
  • RTX 2070
  • View 71 Case

I made a post on Reddit and one of the posters told me to visit here, because this is about performance and I would like thoughts on my performance results. Here is how I am set up.

Everything in the X470 Gaming M7 AC bios is default except:

  1. Precision Boost Overdrive set to 'Enabled'
  2. CPU voltage set to 1.3v
  3. Memory timings set to 'fast' via Ryzen Memory Calc

With this setup I get these results:

Cinebench: https://i.imgur.com/UFYIlve.png
Aida64: https://i.imgur.com/kfZZwAv.png
CPU-Z: https://valid.x86.fr/44yek4
CPU Mark: https://i.imgur.com/IMB8ARb.jpg
CPU Mark Chart: https://i.imgur.com/WyDF652.jpg
Corona (Pos 19-20): https://corona-renderer.com/benchmark/results/cpu/2700x
UserBenchmark: https://www.userbenchmark.com/UserRun/13438858
In HWInfo64, the motherboard sensors, the 'Vcore' displays as 1.312V current and minimum with the maximum displaying 1.352V. It is set explicitly to 1.3V in bios and displays as such everywhere else. Running Cinebench I do see it rise from 1.312V to 1.352V. When set to default voltages it displays 1.44V.

With BCLK 102 I get these results:

Cinebench (Score: 1984): https://i.imgur.com/oCSUmJs.png
CPU-Z: https://valid.x86.fr/fpwr56
UserBenchmark: https://www.userbenchmark.com/UserRun/13450764
I have not kept this BCLK OC for day-to-day use. Time to use this machine as normal.

The userbenchmark.com results sit at position 4 (for the first results) and the second result made a few hours ago, should be at position 2 but is not showing yet.

Does anyone have any thoughts on these results based on how the system is set up? Some on Reddit found the results to be surprising.

I am glad to now have a 2700x and I am really enjoying the new system. I am also looking forward to the possibility of an upgraded CPU without a new socket and board in 2019.
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post #2 of 77 (permalink) Old 01-02-2019, 06:30 PM
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When using PBO, I was under the assumption that one was supposed to leave the Core Voltage on "Auto".

Those Cinebench scores appear extremely high for a non-overclocked 2700X.

I have an MSI X470 gaming pro carbon, and also noticed a discrepancy in the Vcore voltage reading between what I have set in Bios, and what HWInfo64 shows. Setting the Vcore to 1.425 in bios results in HWinfo64 showing 1.433V. The same applies for Ram Voltage as well. Setting ram voltage to 1.4V in bios, but shows up as 1.409 in HWinfo64. I brought this up in another thread but never received a through answer.

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post #3 of 77 (permalink) Old 01-03-2019, 12:28 AM
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I think that's the highest scores I've seen using PBO and not manual clocks. About 100 points above my scores and (1860-1875 usually) those usually line up with others, or abit above. Weird.


That's usually the score you see when using a manual clock around 4.2ghz.



What RAM timings do you use?
What kind of cooling?

Last edited by frong; 01-03-2019 at 01:16 AM.
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post #4 of 77 (permalink) Old 01-03-2019, 12:40 AM
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Quote: Originally Posted by frong View Post
I think that's the highest scores I've seen using PBO and not manual clocks. About 100 points above my scores and (1860-1875 usually) those usually line up with others, or abit above. Weird.


That's usually the score you see when using a manual clock around 4.2ghz.



What RAM and timings do you use?
What kind of cooling?

Does PBO oc all cores at same speed like 4.3GHz?
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post #5 of 77 (permalink) Old 01-04-2019, 03:56 PM - Thread Starter
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F4-3200C14D-32gtz at 14-14-14-28 (Ryzen Memory Calculator 'fast' timings)
Noctua NH-D15 SE-AM4 cooler.
Set CPU Voltage to 1.3V in MSI M7 AC bios. Enable PBO and that is it. Cinebench 1960+.
I have even set the CPU Voltage to 1.2875V earlier today, that ran even cooler.
I will post updated results later.

Last edited by constructorx; 01-05-2019 at 12:50 AM.
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post #6 of 77 (permalink) Old 01-04-2019, 04:10 PM - Thread Starter
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Quote: Originally Posted by rdr09 View Post
Does PBO oc all cores at same speed like 4.3GHz?
On this machine it does. All cores show as boosting consistently.
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post #7 of 77 (permalink) Old 01-04-2019, 06:40 PM
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All cores will boost... With my cooling and a -.1 voltage offset, rendering/ synthetic tasks boost all cores to 4.1 or 4.0 GHz (closer to 4.1 - but after heat soak in Intel Burn Test, they creep back down to 4 GHz).

"Lightly threaded" loads 4.2 GHz on the utilized cores. One or two threads, peaks up to 4.35 GHz.

I wouldn't mind running manual voltage, but offset really saves power, down to like .7 volts on low-use cores. PBO even with the offset shoots up the voltage to 1.4 to 1.45... Without offset, up to 1.55v.

I did an IBT run at 4.2 GHz locked at 1.4V, and my power consumption jumped by 70 Watts at the wall compared to just using PBO. Could I lower the Voltage, probably, but I just wanted to do a quick run since I'm spec'ing out a new PSU.

CPU
AMD Ryzen 2700X
Motherboard
Asus Prime X470-Pro
GPU
EVGA GeForce RTX 2070 XC Ultra
RAM
TeamGroup T-Force 16 GB (2x8) Pro Dark (B-die TDPGD416G3200HC14ADC01)
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Last edited by umeng2002; 01-04-2019 at 06:44 PM.
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post #8 of 77 (permalink) Old 01-05-2019, 10:06 AM
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I don't get how you achieve that score with PBO. What do your cores boost to during the test?


I get around 1860 +-10 with PBO and can achieve ~2000 with manual clocks as a reference. That seems to be in line with other benches I've seen.
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post #9 of 77 (permalink) Old 01-05-2019, 11:47 AM - Thread Starter
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Quote: Originally Posted by frong View Post
I don't get how you achieve that score with PBO. What do your cores boost to during the test?


I get around 1860 +-10 with PBO and can achieve ~2000 with manual clocks as a reference. That seems to be in line with other benches I've seen.
Here is a mobile camera shot of the CPU-Z run (apologies for bad quality, it was off a tablet):

https://i.imgur.com/m72lVV4.jpg

You can see all cores boosting to 4.43GHz and gave this result.


Today I took the BCLK even higher to 103.

I set:

Led to results:

userbenchmark.com

So just to recap. My settings for these results were:
  • PBO Enabled
  • BCLK 103
  • CPU Core Voltage 1.35V
  • Memory timings from Ryzen Memory Calculator of 'fast' for kit (F4-3200C14D-32gtz).

That's it, no setting of core frequencies or anything else. This is why I am posting to see if others get similar results.

Last edited by constructorx; 01-05-2019 at 11:52 AM.
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post #10 of 77 (permalink) Old 01-05-2019, 12:42 PM
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Quote: Originally Posted by constructorx View Post
On this machine it does. All cores show as boosting consistently.
Quote: Originally Posted by umeng2002 View Post
All cores will boost... With my cooling and a -.1 voltage offset, rendering/ synthetic tasks boost all cores to 4.1 or 4.0 GHz (closer to 4.1 - but after heat soak in Intel Burn Test, they creep back down to 4 GHz).

I did an IBT run at 4.2 GHz locked at 1.4V, and my power consumption jumped by 70 Watts at the wall compared to just using PBO. Could I lower the Voltage, probably, but I just wanted to do a quick run since I'm spec'ing out a new PSU.
I can't imagine if say the 3700X with all its cores boosting to 4.5GHz. Wow.
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