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.
Workstation: Ryzen 1700X, 16 gigs DDR4-2400, RX 480, Win10 Pro x64
Plaything: 2008 Mac Pro, 2x Xeon E5462s, 6 gigs ECC DDR2-800, GTX 1050 Ti, El Capitan / Win10 Pro x64
HTPC: i3 4170, 8 gigs RAM, Geforce GTX 1050 Ti, Windows 8.1 x64