To measure power draw, we hook-up our power meter on another system via USB. Our power meter is capable providing a chart of power the watts currently being consumed by the unit plug into it. We take the average of 15 minutes idle and 15 minutes load to show our power daw. Our load test is SuperPI 12K. A power virus scenario which you will never encounter on regular use. This is a worst-case scenario but is lighter on power than our previous AIDA64 stress test which is an AVX test, which draws more power than normal. The raw data from app is gathered and we get our results. Temperatures are also captures during this time.
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Various configurations will play a factor on how much you are consuming and the same applies to our test. We try to keep our test bench uniform at all times (same memory, graphics card, board if possible, etc). All tests are done with the motherboard or CPU on out-of-box settings as indicated in our Test Setup page with only XMP applied.
CPUs behave on how motherboard vendors handle their boost clocks. In this case, ASUS has opted to disable multi-core enhancement on this board which restrains our CPU to default Intel settings which is a 125W TDP. ASUS has indicated that users can change this but we’re interest in seeing how processors perform on an out-of-box scenario. AMD has their own implementation but is a little more tame than what Intel permits with their motherboards. The chart below shows our 20 minute stress test with the frequency and temperature readings over time.
As you can see, both CPUs idle in their boost states in the first few seconds but once the workload is initiate a few seconds in, the difference in how they handle all-core load kicks in. Intel will have its Turbo Boost Max kick-in and that will push the CPU but only for a short duration, as it drops to its maximum 125W TDP rating. In this state, The 3900X and 10900K sit just aa few Mhz apart for the rest of the stress test.