I optiminer miner does not work, 2 cards do not want to engage in mining that can be 
With optiminer there's always a card hanging and I don't want to babysit rigs. CM 11.1 no problems!
Optiminer 1.6 has been rock solid for days on my Ubuntu 14.04/fglrx box. One of my R9 380's was hanging at 1550 memory clock, but has been fine at 1500.
So if optiminer stresses the hardware more than CM, the issue is not with optiminer its your overclocking.
I just don't agree. I'm not over clocking any of my cards (3 Radeon R9 380X and 1 Radeon HD 7870), running Windows 10 using the 15.12 driver. I continue to receive BSOD while running optiminer, or the thread hangs and I must restart the application, this is occurring every 2-3 hours. When optiminer is running, I always get block pixels on my screen too. Maybe optiminer is more stable on Ubuntu than Windows 10, but there is definitely stability issues. I can overclock all my cards by 10% and run Claymore without any issues.