You should inform yourself a bit more about Algorythm of coins before u buy something that will u only cost money.
Antminer S3 mines the SHA256 Algo.
MUE is qubit Quark and will switch to X11 Algo.
And i also think u dont have a low ROI with CPU mining MUE.
Fixed that

ANd yes, no sense in cpu mining, it isn't worth it other than for the learning experience.