Yes, dual-channel's what you need. The FX-8350 loves memory bandwidth, and it takes a lot to reliably feed all those cores. Grab another 8 gig stick, run your memory at stock speeds to start, and experiment to see if the second stick can be pushed as far as the first.
I was expecting this to be about a grossly underpowered CPU holding back a graphics card. Like the Smithfield Pentium D that's trying to feed a Geforce GTX 750 Ti at my house. *cough* Don't look at me like that.
Workhorse: FX-8320, 24 gigs RAM, Geforce GTX 970, Xubuntu 16.04 x64
Plaything: i5 6600K, 16 gigs RAM, Radeon 7970, Windows 10 x64
HTPC: i3 4170, 8 gigs RAM, Radeon R7 370, Windows 8.1 x64