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1. it uses less amperage= less hydro
2. faster start up time (to max rpm)
3. blade speed is constant under load (rpm does not vary)
i changed my 3650 over to 240v a month ago, you will notice a difference, i also changed my bandsaw & bought a 240v dust extraction unit, no more 110v for me if i can help it.
If the 110 circuit you are plugging the saw into has other things drawing from it, you might notice better performance on a 220 circuit. If you have a dedicated 110 with nothing else plugged in, you will notice no difference by switching. As the previous responder noted, the amount of electrical power you use will be the same. This subject has been discussed numerous times on the WoodNet Forums.
It depends on your current electrical wiring. If you're current 110v circuit is adequate and the saw is running optimally, you probably won't see a difference. The 3650 only has a 13 amp motor which has a fairly light amp draw...a good dedicated 20 amp 110v circuit should be fine. If the lights are dimming and the saw is slow to come up to speed, a 220v might help. Otherwise, I wouldn't bother with running 220v.
Good blade selection and good alignment are likely to make more of a difference.