yeah i have 4 slots available in my box so i could add 2 220 outlet. My feed from the pole is 100amps so would a 40a 220v socket work? Is it true that 220 is more efficient then 110?
You could install 4 220 circuits or 8 120 circuits. You may be able to convert some of your existing circuits to doubles and get even more.
220 has less wire loss which is of little value here.
220 has a slightly better power curve in PC power supplies. A couple of percent is a couple of percent.
As long as the sum of what you are running now is the same is what you plan on running once you get rid of the fire hazards ... do it.
Oh, and while there technically IS a 220v 40A socket, I haven't seen one and it is not common in computer equipment. 220v20a and 220v30a are common.