You might try using a program like sapphire trixx, it will allow you to sync the clocks and fans plus disable ulps. The latter often causes problems in crossfire. This could lend a hand to the stability of the setup. I use trixx and have been getting exceptional performance. Though my cards are a step down from yours. Also 13.5 caps might not be needed. I don't have it installed, i think the 13.8 driver already has them integrated. I generally don't use them anyway, but rather create my own choosing either AFR friendly or Optimize 1x1 in ccc. I have seen increased performance this way as opposed to using a standard preset. After all everyone's system is different and may also behave different. You can't cookie cut that.
Asus Sabertooth 990fx r2.0, AMD 8350fx @ 4.8Ghz w/ Corsair H80i, Dual Sapphire 7870 ghz edition OC, 24GB G. Skill 12800CL 9-9-9-24 @1600Mhz, 120GB Kingston SSDNow!, 1TB SG MomentusXT SSHD, Corsair TX850M, Mat*****a Blu-Ray Burner, Logitech G930 7.1 Headset, Razer Deathstalker Keyboard, Razer Mamba Wireless Mouse, Tri-Asus vg23a 3D Monitors
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