dude yours is such an old proccy that too intel you may not be able to do much whatsoever
it will also degrade your life though the amount is small and can be neglected as you won't be using your cpu more than 3-5yrs since the time you bought.So,IT SHOULD GO OK,I AM NOT SAYING THAT IT WILL GO OK.
Also,you may be able to do about 5-10% to your cpu which most likely than not ,won't affect your peformance that you can observre not that there won't be increase but practically very small in anything except synthetic benchmarks.
Also,try using reliable software.
Be cautious that this voids warranty and your motherboard can get damaged also which may intrun ruin your peripherals,ram,graphic card etc.
Though you can check with others,asking them and confirming whther the graphic card , ram etc is in danger too as well.
Also,pls check with others whether warranty for all components is voided or not.
WITH SUCH AN OLD PROCCY ,DON"T DO EVEN 1.9 at first ,infact with any component do with small increments , say of few megahertz.
What is your mobo,ram brand etc which you can tell us.