He seems to know a little more than I about this. You could go 8 gigs at 1x8gb (according to pc partpicker, it is about 1 dollar cheaper), but from my experience most apps that use more than 4 gigs, really need more cpu power. I don't know what he's saying exactly about 8 chip vs 16 chip, but it really sounds like a lot headache for 6+ year old motherboard.
I would save for a new computer to be honest. I know you said ATM you can't afford one, weren't looking to build one. But You really won't see much performance boost for that mobo and most important that chip with 8 gigs ram.
I suggest saving for at least a devil's canyon Pentium "G3258". Ideally a 4th/5th/6th gen i5. You could honestly get a factory built PC capable oh handling...