Depends on the ASIC you are referring to.
One thing is for sure, is that higher clock speed of different ICs even of same designed application does not mean the higher clock rate one will be faster.
Take for example a ripple-carry 8-bit adder conpared to another 8-bit carry-lookahead adder. If you clock them, the 8 bit adder would require 18 clock cycles (8*2 +2) while the carry-lookahead requires only 5 clock cycles (lg2 8 +2).
And disk drives are very different from network cards. Also typical disk IO ASICs range from 10-1200 MHz (some HDD vs PCIe SSD), yet it is still dependent on your monetary budget, power/thermal budget, space budget etc.
If you can get your hands on some affordable 45nm process you might get better clocks and thermals, but again clocks are not everything and you might save more money going for TSMC/GloFo old 90nm or 65nm process and getting great performance for your specific need with some clever custom microarchitectural designs.