1) Beneficial for what exactly, what's the end goal?
2) you didn't really list a routine, you gave a list of days and body parts.
3) Biceps before back? chest & tris immediately before shoulders? If you're doing some lighter pump work then fine, but if you're talking about really hammering those body parts good luck.
4) Overtraining is usually under-recovering. And the answer is it varies. We know nothing about you, & it all depends on your current abilities & recovery protocol. If you're an active duty SEAL who can eat & sleep like a horse you'll be able to do a whole lot more than a fresh-off-the-couch fellow with insomnia and a crappy diet.
So, give us your stats, goal, and a detailed snapshot of your current training