I don't know why people keep using these old PCs that consume 70w+, buying a new board is going to save itself by the electricity cost if you're going to be turning it on 24/7.
My Rock64 consumes 1.5w, which is going to cost about 20c/month, which is almost nothing.
I have Pentium G4650 that consume about 13w, which will cost about $2/month.
A 70w PC will cost about $10/month. That's $120 a year. You can get a new PC for that cost.
Because first this rig is experimental (it's on the way out I'm just waiting for my mobo to die) and also because I just can't throw a computer that still works away even if it's obselete.
Before you ask I rarely turn this on from now on, as I no longer have to spend on this, I'm still considering a lightweight rig (low power cpu) or a Sbc, but know that nothing is set in stone yet.