If the requirement is single core 2.2ghz and you have 2 1.60 ghz then yes.
If the requirement is 2.2 Ghz on 2 Cores (CPUs are physical chips, cores are the amount of cores inside a single cpu), then it will probably "turn on" but work very very badly.
Aditional information from your side would be halpfull (check other posts of people to see How you should ask the question in order t give the information we need).