I am getting ~38 sol/s with (3) Sapphire Nitro RX480 4GB cards on Ubuntu 16 with the latest amd-pro driver.
The BIOSs are modded for 2000 memory clock and the timing straps from the 1625 clock speed.
Using good SSD and 8GB of quality RAM - Gigabyte AM1M-S2H with Athlon 5350 APU.

My issue is the program won't run for more than an hour before one of the cards dies or the program crashes.

zogminer has stayed-up just fine, but not the pre-built zcashgpuclient_silentarmy binary.

I like the speed, but, can't do the constant reboots.
Anyone with similar experience?