※ 引述《NerVGear (Phantom)》之銘言：
: 來源:https://reurl.cc/WnEb7
簡單重點翻譯(附原文)
為了容易理解不一定完全照內容翻
有錯請指正
Understanding What's Going On
We have determined that many popular monitoring tools are quite aggressive in
how they monitor the behavior of a core. Some of them wake every core in the
system for 20ms, and do this as often as every 200ms. From the perspective of
the processor firmware, this is interpreted as a workload that's asking for
sustained performance from the core(s). The firmware is designed to respond
to such a pattern by boosting: higher clocks, higher voltages.
許多監控軟體每200毫秒會喚醒每個核心20毫秒
對韌體而言這是一項負載
所以核心會使用更高的頻率與電壓運作
The Effect of This Pattern
So, if you're sitting there staring at your monitoring tool, the tool is
constantly instructing all the cores to wake up and boost. This will keep the
clockspeeds high, and the corresponding voltages will be elevated to support
that boost. This is a classic case of observer effect: you're expecting the
tool to give valid data, but it's actually producing invalid data by virtue
of how it's measuring.
符合上述行為的監控軟體會導致觀察者效應產生
(你使用監控軟體想看數據但因為軟體本身一直給CPU負載
導致CPU不是真正的idle狀態 數據根本不對)
What about Ryzen Balanced vs. Windows Balanced Plan?
By now, you may know that 3rd Gen Ryzen heralds the return of the Ryzen
Balanced power plan (only for 3rd Gen CPUs; everyone else can use the regular
ol' Windows plan). This plan specifically enables the 1ms clock selection
we've been promoting as a result of CPPC2. This allows the CPU to respond
more quickly to workloads, especially bursty workloads, which improves
performance for you. In contrast, the default "Balanced" plan that comes with
Windows is configured to a 15ms clock selection interval.
Some have noticed that switching to the Windows Balanced plan, instead of the
Ryzen Balanced Plan, causes idle voltages to settle. This is because the
default Balanced Plan, with 15ms intervals, comparatively instructs the
processor to ignore 14 of 15 clock requests relative to the AMD plan.
So, if the monitoring tool is sitting there hammering the cores with boost
requests, the default plan is just going to discard most of them. The core
frequency and clock will settle to true idle values now and then. But if you
run our performance-enhancing plan, the CPU is going to act on every single
boost request interpreted from the monitoring tool. Voltages and clock,
therefore, will go up. Observer effect in action!
在Win10電源設定內使用Ryzen專用電源設定可以啟動CPPC2
讓CPU在受到負載的時候能在1毫秒的時間切換頻率
而普通的電源設定需要15毫秒的時間
部分使用者會發現切換到普通的電源設定能讓待機電壓降低
是因為普通的設定會忽略每15個週期(毫秒)內14次的切換頻率要求
換言之就是ryzen專用電源設定下CPU有更長的時間是維持在受到負載的狀態
所以頻率跟電壓都上升了(觀察者效應的真正原因)
Okay, Rob. Shhhhh. Just Tell Me How I See Voltages? I Just Wanna Check!
CPU-Z does an excellent job of showing you the current/true idle core voltage
without observer effect. In my example image, I've configured a Ryzen 9 3900X
with all the same things we would advise the public to use: Windows 10 May
2019 Update, the latest BIOS for the Crosshair VIII, and chipset driver
1.07.07 (incl. the AMD power plan). Yes, we're monitoring the behavior of the
core, but we can see that idle voltage looks great. The tool is not
compelling the firmware to boost when it's not needed.
建議大家使用Win10 May 2019更新(就是1903)
外加最新版的BIOS跟1.07.07晶片組驅動(還要使用驅動安裝的ryzen專用電源設定)
CPU-Z不會促使CPU持續在負載狀態
Is There Anything Else I Need To Know?
Yes, actually. The Ryzen CPU depends heavily on a low-power state called cc6
sleep. In this sleep state, core clockspeeds and voltages are basically nil
as the core is sleeping and gated. It is not possible to report out the state
of the core in this sleep state without waking the core, probing the status,
and killing the power savings of cc6. Therefore, MOST tools can only show you
the last clock and voltage of the core before the core went to cc6. So if you
were at full 4.5GHz+ boost @ 1.48V, then the core went to sleep, many tools
might show the core(s) stuck at that value. The tool just doesn't know any
better.
However, the latest version of AMD Ryzen Master can uniquely show you clocks
and voltages in a cc6 state. No other tool can do it. Neat piece of info for
the people looking to understand how their core behaves!
Ryzen CPU在進入CC6睡眠狀態時
頻率跟電壓基本上是0
在這狀態下不能回報核心的狀態(電壓/頻率等參數)
大多數的監控軟體只會顯示進入CC6狀態前最後的狀態
但最新版的AMD Ryzen Master可以在CC6狀態下正確測得CPU的參數
To ensure you're following my instructions correctly:
1.Do not have two different monitoring apps running to compare them, e.g.
Ryzen Master and CPU-Z. Or CPU-Z and HWINFO. I see many folks trying to run
two apps at the same time, so they can compare behavior. This can cause a
race condition, which will affect your results.
不要同時使用不同的監控軟體來比較CPU參數
2.Just run CPU-Z at the desktop, by itself, with no other monitoring apps
going.
只使用CPU-Z
3.Don't forget background apps like Corsair iCue, NZXT CAM, or software
that came with your mobo are also monitoring tools.
不要忘了Corsair iCue / NZXT CAM或其他主機板的公用軟體之類的也是監控軟體
4.Make sure all BIOS voltage settings are set to NORMAL or AUTO. Only
enable your XMP profile for the purposes of this test.
確認BIOS除XMP之外的電壓設定都在NORMAL或AUTO
5.Make sure you have chipset driver 1.07.07 (from amd.com), Windows 10
v1903, and the latest BIOS for your motherboard.
確認晶片組驅動是1.07.07 / Win10版本是1903 / BIOS驅動是最新版
6.Do not worry if your processor is not exactly matching mine with voltage.
All we're looking for is the CPU to go to < 1.0V when you're staring at CPU-Z
doing nothing. This indicates idle is workig correctly.To ensure you're
following my instructions correctly.
如果電壓跟範例的不一樣也不需擔心
只要在正確的環境下(上述環境且只開CPU-Z監控狀態)CPU電壓是小於1.0V
待機狀態是正確運作的
It is perfectly okay if your CPU is periodically using 1.4-1.5V to achieve
boost frequencies, and you should see dips into sub-1.0V as the CPU goes into
idle.
CPU BOOST的時候電壓在1.4V~1.5V之間是OK的
而且運作正確的話在待機狀態電壓會降到1.0V以下
If your BIOS has the option to set CPU voltage to AUTO or NORMAL, please try
setting it to normal
如果BIOS內的電壓選項有AUTO或NORMAL 請選NORMAL
As a temporary workaround, you can use the standard Windows Balanced plan.
Edit this plan to use 85% minimum processor state, 100% maximum processor
state.
替代方案是選擇普通的電源設定並且編輯進階電源設定內容如下：
處理器電源管理
>最低處理器狀態 85%
>最高處理器狀態 100%
Please note that it is totally normal for your Ryzen to use voltages in a
range of 0.200V - 1.500V