If the GPU contributes significant heat, then that will cause the CPU to throttle more aggressively. Premiere uses both the CPU and the GPU, while Geekbench only uses the CPU. So what’s going on here? Why does this test not replicate the throttling seen in other tests? Part of the issue is the test themselves. When running the stress test I also ran the Intel Power Gadget on the MacBook Pro (Mid 2018):Įven under sustained load, the i7 processor was running at 3.0-3.1 GHz, well above the processor’s base frequency of 2.6 GHz. If you compare the multi-core scores with the build times, you’ll see that a higher multi-core score predicts a lower build time. Let’s also take a look at the multi-core Geekbench 4 scores for these Macs: The low variations suggest no significant throttling is happening in any of the Macs. The laptop Macs have a higher, but still reasonable, run-to-run variation of 2.6% and 3.9%. The desktop Macs have a very low run-to-run variation, with the Coefficient of Variation (CoV) less than 0.5% for the Mac Pros and the iMac. Let’s take a look at the build time variation for the Macs: Model The 4-core MacBook Pro is significantly slower than the 6-core MacBook Pro, taking 46% longer to build Geekbench. However, the 6-core MacBook Pro is a close second, taking 25% longer to build Geekbench. Unsurprisingly the 12-core Mac Pro is the fastest Mac. Here are the median build times for the Macs: While I don’t have access to an i9 model yet, I expect the i7 to throttle similarly to the i9 when running multi-core tasks. I ran the stress test on several Macs in the Primate Labs office, including a MacBook Pro (Mid 2018) with an i7 processor. The stress test takes between 30 minutes and 60 minutes to complete. Each iteration is timed separately to see if performance changes over time.
The stress test emulates a developer workload by building Geekbench 4 from scratch ten times in a row. To test whether this is the case, I wrote a quick stress test. There is increasing concern that the new 6-core MacBook Pros (in particular the i9 model) throttle under sustained load to the point where they are slower than the old 4-core MacBook Pros.
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