RX 480s - burning up my powered rises

I've had the Sapphire RX 480s for about 6 days or so. The system has been up and down. This rig has been harder to stabilize than my R9 390 rig was - that thing throws off a bunch of heat, but it just chugs along at 190 MH/sec on ETH plus 3000 GH/s in Siacoin.

Tonight I noticed that my powered risers on the RX 480 rig are burning up. I'm running the latest AMD drivers, and AMD claims to have addressed the power issue with their latest release. That may be, but...

Here are some pics of the risers. I've removed the RX 480s from my system, and I'll be replacing them with Sapphire Nitro+ RX 480s as soon as I can get my hands on them.

smu.gs/2ba1SWk

smu.gs/2b9PGl4