You'll probably get better performance with 183bclk and 1833mhz memory cyrptik.
22x cpu multiplier, 183bclk, 5x mem multiplier, 20x uclk multiplier will give you almost exactly the same speeds, but you'll have a uclk 2x your memory speed.
I'm also kind of curious why you're sitting at 4ghz with a 990x? ;) You can probably do 4.4 without breaking a sweat!