Where do you get the 33-38% increase? This isn't between 10th and 8th gen, surely? That seems way too high an improvement in IPC for two generations.Even though the max turbo speed is lower, it will still be faster since it is using Icelake cores which are faster between 33-38 percent at the same processor speed. So it will probably be around 16 percent faster on a single core max turbo. You can read more from Anandtech's Icelake testing: https://www.anandtech.com/show/14664/testing-intel-ice-lake-10nm/4
EDIT: Indeed check the graph:
Quote from Anandtech: "This graph shows the single thread performance of Skylake and beyond, compared to 5th Gen Broadwell hardware. Right at the very end, we see Whiskey Lake performing +42% above Broadwell, and Ice Lake performing +47% above Broadwell. A quick calculation of 1.47/1.42 means that even Intel is only predicting an absolute gain of ~3.5% for Ice Lake over current generation systems."
Which (all else being equal) means that you'd need ~4.5 Ghz 10th gen to match a 4.7 Ghz 8th gen.
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