As shown above, -50mV is already in the stability grey zone (i.e. it works for most, but not for everyone), but still delivers impressive results. We publish here our results of a single test.
Configuration and environment:
- XMG NEO 15
- Intel Core i7-10875H (8 cores, 16 threads)
- NVIDIA GeForce RTX 2070 SUPER
- 2x 8GB DDR4-2933
- Windows 10, v1909
- CPU cooling with liquid metal ex works
- Fan control Original from ODM
- Summer room temperature of approx. 28°C
All tests are performed in the highest performance profile of the system. This is the profile where the power limits of CPU and GPU are at their maximum and where the fan table also reacts quite snappy. So don’t be surprised if the fan speed fluctuates a bit in tests with low load (e.g. some PCMark segments). In other profiles (Silent, Balanced) and in idle the system is of course much more relaxed.
Methodology
We executed each benchmark 3 times and noted the best result in each case. Between each run the system was sufficiently cooled down with manual maximum fan speed. Exceptions are those game benchmarks which already fully utilize the system in the menu (before the benchmark starts). Those are noted below the diagrams.
Results by points
The results based on benchmarks scores are well within expectations for most of these test. CPU-focused benchmarks show a clear improvement through undervolting. In Graphics-heavy benchmarks, the difference becomes less.
The 4% drop at Port Royal is a surprise at first. Since Port Royal relies completely on GPU-Ray tracing, the CPU has relatively little to do here. The low CPU temperature causes the fans to turn slower, which makes the GPU run warmer and limits the GPU boost a bit. The fan curve is not optimized for such a one-sided GPU load. See the diagram below for more information. Finally, there are four specific games which generate a lot of CPU load. The performance increase of about 1-2% via CPU undervolting is within expectations for these titles.
- 1 - Introduction
- 2 - BIOS-based Undervolting
- 3 - How to safely apply CPU Undervolting Step-by-Step
- 4 - Undervolting on the iGPU
- 5 - Comet Lake Update: New tolerance levels on Intel’s latest platform
- 6 - Detailed single unit test: 0mV vs. -50mV
- 7 - Diagrams: CPU temperature and fan speed over time
- 8 - Conclusion and survey
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