Is there any reason why the Intel CPU wouldn’t run at 4.9 GHz for the single core benchmark though - whilst the M1 would be limited to a much lower frequency which it can sustain for much longer?
I think, but I'm not 100% sure, that limits are on overall TDP, i.e., single-core workloaad can run on turbo indefinitely. Then aalso I'd assume benchmarks are much longer than any reasonable value of tau which means it integrates out (i.e., Intel performance may be higher in short-term).
Edit: that is probably one of the reasons single-core gap is smaller