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2700x Performance in PBO (Precision Boost Overdrive) only

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post #21 of 77 (permalink) Old 01-09-2019, 12:24 AM - Thread Starter
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Quote: Originally Posted by umeng2002 View Post
What cooing do you have? What's your CL rate at 3400?

Just did a run myself: https://www.userbenchmark.com/UserRun/13656462
I posted this earlier (above):

This is my fastest memory run: https://www.userbenchmark.com/UserRun/13468774 (126%, the current top score is 122%, only first run is listed with userbenchmark.)

As far as my 3400 CL settings, I will take a look and post them later, I am not at my machine at the moment.
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post #22 of 77 (permalink) Old 01-09-2019, 12:32 AM
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Quote: Originally Posted by rdr09 View Post
I can't imagine if say the 3700X with all its cores boosting to 4.5GHz. Wow.
Yeah that would be something, but even with Ryzen 2000, in light usage like in games and online games, ALL core boost is 4.2 GHz with PBO.

All core boost in P95 and Intel Burn Test creeps back down to 4 GHz because of the added heat.

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post #23 of 77 (permalink) Old 01-09-2019, 12:46 AM
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Quote: Originally Posted by umeng2002 View Post
Yeah that would be something, but even with Ryzen 2000, in light usage like in games and online games, ALL core boost is 4.2 GHz with PBO.

All core boost in P95 and Intel Burn Test creeps back down to 4 GHz because of the added heat.
A YTuber demonstrated the difference of PBO on and off in PUBG and yes, it wasn't actually 4.3 when BLCK is set to 100 (99.8).
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post #24 of 77 (permalink) Old 01-09-2019, 01:40 AM
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Because of slight variation in BLCK between mobos, I just look at the multiplier. The BLCK isn't supposed to change unless you manually change it; therefore, it's a better way to compare clock speeds.

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post #25 of 77 (permalink) Old 01-09-2019, 02:09 AM - Thread Starter
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Quote: Originally Posted by umeng2002 View Post
What cooing do you have? What's your CL rate at 3400?

Just did a run myself: https://www.userbenchmark.com/UserRun/13656462
I have just checked, my 3400 CL settings are 14-15-14-14-30.

I also tried 3200 CL 12-13-13-13-22 and it was fine, though I was a bit uncomfortable with the 1.5V memory voltages. So I run CL 14-14-14-14-28.

Your results are also really good, 'outstanding' to be precise.

Last edited by constructorx; 01-09-2019 at 02:14 AM.
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post #26 of 77 (permalink) Old 01-09-2019, 03:42 AM
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I've used 3x 2700X.

i) 1805 SUS (ie week 05 2018)
ii) 1825 SUS (ie week 25 2018)
iii) 1835 PGS (ie week 35 2018)

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1805 SUS was poorer on PBO Enabled than 1825 SUS, IIRC ~75MHz ACB gap, 1835 PGS sat somewhere in between. So I'd some difference but not vastly big. RAM IMC difference was greater than CPU MHz at stock or PBO enabled.

PBO: Enabled yields usually ~1830 - 1900 in CB15, 1830 say UEFI defaults (ie 2133MHz loose timings), 1900 is more like 3200MHz and even upto 3600MHz C15 1T I see no affect of increased RAM MHz on CB score.

1900+ is with BCLK tweak, 1947 shared for BCLK 103 seems on the money to me, as I have results like that. Below results will show RAM ratio in RTC 3466MHz as I used that ratio with BCLK 103 = 3570MHz.

Spoiler!


Perhaps the >1950 CB15 scores you have are down to limiting VCORE, which in turn would allow higher boosting as create headroom within limiter parameters of PB/XFR2 stipulated by PBO being enabled. Will have to try this out.
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post #27 of 77 (permalink) Old 01-09-2019, 06:51 AM - Thread Starter
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Quote: Originally Posted by gupsterg View Post
Perhaps the >1950 CB15 scores you have are down to limiting VCORE, which in turn would allow higher boosting as create headroom within limiter parameters of PB/XFR2 stipulated by PBO being enabled. Will have to try this out.
Yes, this is the case. I have three sets of voltages saved to my OC profiles (between 1.30V and 1.2685V). The lower the voltage (below 1.31V) the higher the all core boost (until it gets lower than 1.28V).

These are my lowest working voltages:

1) CPU Voltage set to 1.275V
Idle:
  • CPU Core #1 VID 1.275 (solid on all cores)
  • CPU Core Voltage (SVI2 TFN): 1.275V
  • Vcore: 1.288V-1.296V (bouncing)
  • CPU Temp (Tdie): 22
  • CPU Temp (Tctl): 32

During Cinebench run:
  • CPU Core #1 VID 1.275(solid on all cores)
  • CPU Core Voltage (SVI2 TFN): 1.275V
  • Vcore: 1.32V
  • CPU Temp (Tdie): 53.3
  • CPU Temp (Tctl): 63.3

Cinebench 1963 Cinebench 1971 (No Explorer running)
CPU Mark 19649 (slightly slower than 1.3V which gets 20k+

CPUZ 5417 - 492: https://valid.x86.fr/ee69jz
2) CPU Voltage set to 1.263
Idle:
  • CPU Core #1 VID 1.263 (solid on all cores)
  • CPU Core Voltage (SVI2 TFN): 1.287V
  • Vcore: 1.272-1.280V (bouncing)
  • CPU Temp (Tdie): 24
  • CPU Temp (Tctl): 34

During Cinebench run:
  • CPU Core #1 VID 1.263 (solid on all cores)
  • CPU Core Voltage (SVI2 TFN): 1.287V
  • Vcore: 1.304V
  • CPU Temp (Tdie): 57.3
  • CPU Temp (Tctl): 67.3
  • CPU Cores did not boost to 4.35GHz solidly like at CPU Core Voltage 1.3V. They were bouncing between 4.2GHz and 4.35GHz.

Cinebench 1971
Cinebench 1972 (No Explorer running and Realtime Priority)

CPU-Z 5420 - 490: https://valid.x86.fr/lcegre
Below 1.28V and the boost is lower but the temps are lower (about 4.3Ghz).
Above 1.32V and the boost is lower but the temps are higher (about 4.25Ghz).

The sweet spot for my system is at 1.2875V to 1.30V the boost is 4.35GHz all core with about 1972 Cinebench and 5420/492 CPU-Z.

I have now settled to these settings:

Vcore 1.296V boosting to 1.328V and 4.35GHz all core PBO (set in bios as CPU Core Voltage: 1.2875V), Cinebench 1977.

Spoiler!
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post #28 of 77 (permalink) Old 01-09-2019, 07:20 AM
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Stability proving for that setup would be a nightmare, you'd never know for sure.

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post #29 of 77 (permalink) Old 01-09-2019, 09:04 AM - Thread Starter
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Quote: Originally Posted by VeritronX View Post
Stability proving for that setup would be a nightmare, you'd never know for sure.
I can cut voltages 2 steps lower and still run benchmarks with no issue, so I have settled for voltages 2 steps higher than that and have been running for a week without issue (after testing memory).

How long on Memtest is long enough?
How long without a crash or freeze is long enough?

The only thing that has been changed is the voltage and memory timings, with PBO (a feature) enabled.

What is it about this setup specifically that would make stability testing a nightmare?

Last edited by constructorx; 01-09-2019 at 09:52 AM.
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post #30 of 77 (permalink) Old 01-10-2019, 03:20 AM
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Quote: Originally Posted by constructorx View Post
I can cut voltages 2 steps lower and still run benchmarks with no issue, so I have settled for voltages 2 steps higher than that and have been running for a week without issue (after testing memory).

How long on Memtest is long enough?
How long without a crash or freeze is long enough?

The only thing that has been changed is the voltage and memory timings, with PBO (a feature) enabled.

What is it about this setup specifically that would make stability testing a nightmare?
try running prime95 for 60 min and see if your system is really stable
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