just a quick question. is it safe to power the s5 with just 1 connector per blade?
Yeah, just make sure you use the ones nearest the ethernet port

So they are like the S3's? No need for all 4 connections unless you'll overclock? Didn't know that.
It's not recommended, but I run a couple like that without issues - never tried OCing them though, wouldn't risk it tbh

Edit: Good quality gauge wires are essential though.