Lower frequency is less demanding, possibly allowing smaller or less numerous devices, more compact layouts for the same circuit, etc. Less threads allows savi

Lower frequency is less demanding, possibly allowing smaller or less numerous devices, more compact layouts for the same circuit, etc. Less threads allows saving on elements that need to be faster to serve more threads, often with one instance per thread: for example, to run at full speed the instruction decoder needs to simultaneously decode one instruction per thread, and each thread is likely to need a separate set of registers to avoid the unpredictable delays and horrible complications of sharing them.