You can see my build in my siggy and I can tell you that FX8320 is good for gaming with the right GPU horsepower and a good OC but not the way to the future.
Got mine with an MSI 990FXA-GD80 v2 originally... It made my $1000 budget build happen a few years back and has had quite a few incarnations over the last couple of years. Including Dual SLI Gigabyte GTX670's for a few months.
First MoBo pushed up daisies a couple months after warranty expired. Probably due to overzealous overclocking attempts on my part (I was a noob) ...but in my defense it never held stable volts for some reason so maybe I got the lemon. Or MSI is just good at timing their hardware to fail. LOL
This MoBo has done the FX8320 right and you'd probably be much happier then me with that Asus Sabertooth. I have been plenty happy with the performance of my FX8320 over the years and it was a great value at the time of my build a few years ago.
The low down is you would be much happier going with CTurbo's pick above in todays cheaper Intel market and well into the future as AM3+ has no further place to go and is already falling behind the curve.
So yeh... do yourself the favor and get the return process started on your Asus motherboard.
Only thing I would offer as a side note is to add to the popular debate by throwing this option into the mix...
Video Card: EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card ($299.99 @ NCIX US)
Generated by PCPartPicker 2015-10-03 01:34 EDT-0400
I really only posted this because this is such a good card. But ultimately... yeh, send the Sabertooth board back. And I really like that R9 390 as well.
Starting to get the itch to start a new system build also.
Truthfully, as far as a new build go's right now for me... nah, it aint in the cards. I'll be holding onto this build as my primary a few more years as it suits my needs perfectly into the foreseeable future. I've learned to lean more towards the practical recently... more doesn't always mean better. Kinda like the overkill of running the SLI'd GPU's. Yeh, it was good to be in some top spots on benchmark lists but overall didn't make any difference in games V-sync enabled at 1080p which is how I prefer to play. Maybe if I had a 144hz monitor it would've meant something to me.
That said this EVGA GTX970 is probably going to be my next splurge... then 16GB more RAM a lil in the future. Then the second GTX970 and then the 4K 144hz Monitor... then... ok I go now.
peace
-John