CPU GPUs Practice Reviews

Challenge: Optimizing AMD Ryzen 7 3800X with Boxed Cooler and Radeon RX 5700 in reference design? That’s how it works! | Tutorial

Before that, we test the current status with a few quick benchmarks, because we want to see where we stand now and compare everything later.

We start by logging the clock, power consumption, current flow and temperatures. CineBench R20 and R15 are suitable for this. CineBench R20 can also be run in a loop and thus the CPU can be used to full capacity (for better heating up).  You can download CineBench R20 here (Download).

Cinebench R20
Cinebench R15

Next a little video editing to generate some real load for a longer time. For this I use the quite versatile VSDC Video Editor in the freeware version (download). I was just looking for something something to make videos e.g. offset on top of each other or to get 2 screens in one picture like here e.g.

 

Finally, a maximum load over 15 minutes with Prime95 (download) and FurMark (download) for the maximum temperatures and the max fan speeds:

Important note

Now we can almost start to optimize, but only almost. First of all, what has changed with Ryzen 3000? Well, it’s not as simple as with the old CPUs, because there are some important things to consider. 

The motherboard should have a good, cool and fast power supply, because the CPU changes load and voltage incredibly fast. If one reaches here for a motherboard, which is badly and/or cheaply equipped, then the CPU cannot use its full potential. Unlike the old CPUs, the Ryzen 3000 is controlled by many more sensors or monitored. In the past, you simply lowered the CPU voltage in the BIOS and if it was too low, the computer crashed. With quite current BIOS versions (and depending on the mainboard) the CPU simply throttles down internally, optically it may even be that the clock rate increases.

Here’s an example. As in other tests, here the program is started and when all CPU cores are at least over 50% load, in HWinfo64 click on the clock below to reset the read data, because we only want to read the data that the program causes under load. That is why you should also make a screen immediately before finishing. Should it not work with other programs, because you use the mouse e.g. may no longer move, then reset immediately before doing so. With AMD graphics cards, you can do this nicely via ReLive, or you can simply press print on the keyboard and paste it into Windows Paint when you are on the desktop.

Here you can see Average Effective Clock in the bottom of area 1 in the backmost column at Average 3.576.9 MHz. The Core Clock in the column Average is around 4.070 MHz. In area 2 above we have the internal temperatures of the CPU. From 95 °C on, the temperature is automatically reduced, which can be seen in the column Maximum. The value for CPU (Tctl/Tdie), where the average is 90.2°C, is also the temperature displayed in the Ryzen Master Tool. However, this tool is only used for readout (download). The CPU PPT shows 122.665W in the column Average.

If the voltage is changed too far down via the offset like now in the second picture, it may happen that the CPU res. the computer no longer crashes, but simply throttles down internally. This looks like that in a direct comparison the result is 24:06 minutes runtime to create the video.

But how can that be, because in the area 1 above I have an average of 4.180MHz at Core Clock, so even over 100MHz more? if we look down, Average Effective Clock shows us ONLY 3.054.1MHz. OK, what shows us area 2 ? CPU (Tctl/Tdie) has a max of 74.4 °C and as an average 73 °C. So this is significantly less than in the first picture. Also CPU PPT below now only shows Average 81.199 Watts!

Influences of other sensors

The temperature is the most important thing there. The temperature regulates the cycle with every degree more, in order to always work at the optimum in connection with the voltage. But this also means: more temperature, less cycle and therefore less power! 10 °C more approx. 50 MHz less, if nothing else throttles down. With the Ryzen 5 3600 and the Ryzen 7 3800X, I have found that CPUs in the 50-60°C range increase their turbo clock exactly between the base clock and the maximum clock speed. Single Core Turbo have, always provided, otherwise nothing throttles. However, this is no longer possible with the boxed cooler if you want to remain very quiet.

Another sensor is PPT, which has just been mentioned and which displays the consumption in watts. This is similar to the TDP that is specified at the CPU. This means that a Ryzen 5 3600 has a TDP of 65Watt and if read correctly, the CPU will also have its 65Watt via PPT. So if we want to optimize now, then it is quite easy to orientate oneself on it. Then we have TDC and EDC which are indicated with amperes and therefore the current flow is monitored. Here too, we have a certain throttling point, especially with EDC.

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About the author

Igor Wallossek

Editor-in-chief and name-giver of igor'sLAB as the content successor of Tom's Hardware Germany, whose license was returned in June 2019 in order to better meet the qualitative demands of web content and challenges of new media such as YouTube with its own channel.

Computer nerd since 1983, audio freak since 1979 and pretty much open to anything with a plug or battery for over 50 years.

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