IntelUser2000
Elite Member
- Oct 14, 2003
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Afaik Ice Lake exhibits this behaviour in AVX512 workloads, not sure about mixed, I haven't checked clocks in mixed workloads.
Whiskeylake and Amberlake does that too. Amberlake even at 7W can drop to 500MHz depending on implementation.
It also depends a lot on system implementation. The XPS 13 ICL can maintain the minimum 1.3GHz, but on battery it probably drops to 1.1-1.2GHz.
Even with AVX-512, there's a noticeable difference between a code that's designed to stress the FPU(matrix multiplication for example) and applications that use the instruction for real workload such as x265. The load on the CPU is not black and white and can vary in a hundred different ways between.
Icelake only has support for the instruction and not the double throughput so the impact will likely be minimal compared to AVX-256. I don't think we'll see dual AVX-512 support in client for a while.
My experience with the i7 Ivy Bridge XPS 12 suggests that its not at all realistic running such power virus workloads(such as Prime 95 plus Furmark). Most laptops/ultrabooks can maintain better than base frequencies quite readily when running either of them.
Just in web browsing workloads the performance is greatly impacted by power management settings, thermals, and even the condition of the battery. Get a DTR or better yet, get a desktop.
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