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Old 09-07-2019, 09:24 AM   #31
Der Hirte
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Originally Posted by NineGzuz View Post
Is the advertised Ghz/Mhz just a theoretical limit? The kind we see from advertised network card and internet speeds, but never actually achieve?
The advertised speed from AMD is the speed which one core can reach at maximum, not all cores. Even when only considering one core, it's not certain you will actually achieve the advertised clock. There are differences on how high the CPU(s) clock depending on the motherboard aswell, not all are the same here.
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Old 09-11-2019, 01:21 AM   #32
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New AGESA in 2 weeks(tm)

https://www.tomshardware.com/news/am...ity,40368.html

25-50 more MHz planned... mine is still 200+MHz below spec on single core load. Maybe now if I’m lucky I will only be 150mhz slower than advertised.
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Old 09-11-2019, 08:52 PM   #33
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Originally Posted by Sandman1330 View Post
New AGESA in 2 weeks(tm)

https://www.tomshardware.com/news/am...ity,40368.html

25-50 more MHz planned... mine is still 200+MHz below spec on single core load. Maybe now if I’m lucky I will only be 150mhz slower than advertised.
Do you have PBO turned on? My 3900x get up to 4540, but I use PBO. There is also evidence of clock variance between motherboards that isn't the CPU itself being the source of the problem. A 200mhz deficit is a lot, and leads me to think its an Asus issue with the x370 boards.

https://www.guru3d.com/news-story/ry...herboards.html
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Old 09-12-2019, 12:57 PM   #34
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Do you have PBO turned on? My 3900x get up to 4540, but I use PBO. There is also evidence of clock variance between motherboards that isn't the CPU itself being the source of the problem. A 200mhz deficit is a lot, and leads me to think its an Asus issue with the x370 boards.

https://www.guru3d.com/news-story/ry...herboards.html
I’m wondering about the board myself. PBO is on (though PBO is the all core boost, PB2 is the single core boost)

I’ve tried several combinations of BIOS settings...
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Old 09-13-2019, 05:29 AM   #35
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I have an AMD ryzen 1700x (manually overclocked)
When I initially purchased this processor, motherboard, and heatsink-fan combo I did not know specifics on how AMD processors overclocked so it was a big learning curve.

In a nut shell without getting into it too much the TurboBoost technology of AMD's processors isn't very good for benchmarking numbers.

The first core is the only core that gets TurboBoost (automagical overclock) and the frequency that it will hit is very much a function of Temperature and Voltage. If your particular system at the instant moment of time the TurboBoost AI wants to kick in spikes too much in temperature then it won't get that "advertised TurboBoost" number. If there isn't enough voltage being supplied then it won't get that advertised number.

There are a lot of factors that determine how much the TurboBoost will boost. Additionally it will only kick in for temporary amounts of time. The core0 load has to reach a certain threshold and it will only engage the TurboBoost temporarily (sometimes for less than 1 second) to get the processes processed faster.

If you're concerned about the automagic TurboBoost technology not being good enough then I would recommend manually overclocking the processor or purchasing an Intel processor. Just realize that TurboBoost technology in AMD or Intel processors isn't a guarantee.

They do not advertise otherwise: source - https://www.amd.com/en/products/cpu/amd-ryzen-9-3900x
go to bottom, mouse over the Max Boost Clock info.

The real world performance of the TurboBoost is very good, the benchmarking world for it is completely different because of its instantaneous on/off behavior to better grind the process queue on just the 1 core 1 thread at a time. If you're running a heavy benchmark that is utilizing all of your cores at 100% cpu usage the HEAT from that will prevent the TurboBoost from kicking in unless you have some really amazing cooler.

TLDR; AMD/Intel Automatic overclock technology is specifically designed for high single core/single thread usage games. A manual overclock will yield better results for everything else.
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Old 09-13-2019, 08:52 AM   #36
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Originally Posted by Sandman1330 View Post
I’m wondering about the board myself. PBO is on (though PBO is the all core boost, PB2 is the single core boost)

I’ve tried several combinations of BIOS settings...
On my Strix X470 board PBO is raising base and boost clocks, with scalar set to 10x and 200mhz offset.
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Old 09-13-2019, 10:53 AM   #37
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I guess people are more concerned some chips not even reaching the advertised clock speed on one core, it differs from motherboard to motherboard. In my case the first core, which is almost as designed for DCS, could hit peak 4.5 or 4.6 and the others 4.1 or 4.2 or whatever as long as it is stable. 4.7 Ryzen 3000 is like ~5.1/5.2 9900K.
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Old 09-13-2019, 06:21 PM   #38
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Quote:
Originally Posted by Der Hirte View Post
......... 4.7 Ryzen 3000 is like ~5.1/5.2 9900K.
I don't like to assume things usually, but here I do assume that is achieved by the very large cache compared to the Intel chips. Keep it close to compute pays as it seems.
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Old 09-13-2019, 07:16 PM   #39
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I know it is a synthetic test but with new ABBA BIOS my 3900X boosts how it should with cca 4591 MHz and 1.494 V.
https://valid.x86.fr/bench/3p2c89/1
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Old 09-14-2019, 06:14 AM   #40
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I know it is a synthetic test but with new ABBA BIOS my 3900X boosts how it should with cca 4591 MHz and 1.494 V.
https://valid.x86.fr/bench/3p2c89/1
See, the chip is faster than stock, boosted 9900K (it's not overclocked I assume). Very sweet news.
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