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Guru3D.com » Review » be quiet! Shadow Rock 3 review » Page 6

be quiet! Shadow Rock 3 review - Preparing the System Overclock

by Hilbert Hagedoorn on: 03/05/2020 01:33 PM [ 4] 2 comment(s)

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Preparing the System Overclock

We'll look at the cooler in several system configurations/conditions. For the audiophiles amongst us your focus should be noise levels mostly. Then there is your normal non-overclocked mainstream usage and then the performance enthusiast overclocking users. So with the many variables in mind we'll be testing three things for the cooler.

  1. dBA noise pressure levels
  2. Temperature with the CPU at default settings
  3. Temperature with the CPU at 4600 MHz with 1.3 Volts applied to the CPU
     


Mind you that all our tests are performed at a room temperature of roughly 21 Degrees C. We decided to go with the Core i7 4790K as it literally is the hottest processor your money can get you. You guys all know that once overclocked with added voltage, the temperatures get out of control big-time.

Why (still) this processor?

For any processor, at a certain TDP rating, the heat signature is roughly the same for most hot running processors, in the 90 Watt marker. Heat is heat, aside from small differences it doesn't matter much what processor you use in that same TDP range.

TDP = thermal design power. 90 Watts TDP tells you the maximum heat a computer chip, in this case, a CPU, may use in watts. e.g. a dual-core, quad-core or octa-core at 90 Watts still is 90 Watts of heat output and all would sit under stress at that e.g. 65 Degrees C range depending on cooler. More watts often mean better performance, but yes higher temperatures and more power consumption as well. Why still the 4790K? Throwing away the many dozens of results we've built up over the years would be a waste, and from a thermal design and heat signature, it makes little difference compared to say the 9900K.

 


So we'll be testing that processor at default clock frequencies, and then we'll blast the processor with 1.30 Volts like shown above. That voltage is not really needed for 4600 MHz but typically will bring the processor with a non-performance heatpipe cooler towards 90 Degrees C (!). We are merely trying to see how the cooler will behave under such stringent conditions. All temperatures reported are the processor package sensor temps. The cores will independently differ a little in Degrees C here and there. We measure at an ambient room temperature of 21 Degrees C.

The CPU stressor

We test processor coolers following a strict protocol. We have already shown you the BIOS settings for the overclock. To stress the CPU we apply the stress modes (default and OC 1.3V) and have our stress software wPrime finish a full run twice. We, however, have a security feature enabled, if a cooler reaches 98 Degrees C the system will power down to prevent it from damage. Below, an example of one of our test runs. We note down the package temperature, the per core temps as such can differ here and there. For LOAD testing we note down the MAXIMUM measured temperature after a two full wPrime 1000M runs. In the example below we use a clock setting of 4600 MHz on all CPU cores with a strict 1.3 Volts on the processor.




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