Depends on the quality of the UPS you buy. If you get an expensive one, your computer may be running completely off the battery which will be a lot "cleaner" power than an outlet.
Power thats in a battery comes from the wall in the first place so I don't see how it is "cleaner" but okay
EDIT: Ive been wondering for a while now but...

Does my laptop somehow have an i5 with hyper threading?
And if it only has 2 cores but they have hyperthreading isn't it an I3?
More edit:
Apperently I can OC it to 3.6Ghz but the bios options are greyed out. Help