Except for when all this hr dumps back to eth etc. it too will take a plunge. All in all both coins will be tight on profitability after this. 

You're forgetting about the CPU botnets that will continue to drive the ZEC price down.

Are.they only cpu? Probably is gpu

The botnets are CPU.

I've got some strange behavior of the miner while tested v5.0.
Miner detected all my cards but used only first one.
Here is some piece of log.
17:30:47:046   283c   parse packet: 296
17:30:47:051   283c   new buf size: 0
17:30:47:056   283c   ZEC: 11/14/16-17:30:47 - New job from zec-eu1.nanopool.org:6666
17:30:47:061   283c   target: 0x00147ae1 (diff: 3200H)
17:30:47:066   283c   ZEC - Total Speed: 114.094 H/s, Total Shares: 4, Rejected: 0, Time: 00:01
17:30:47:071   283c   ZEC: GPU0 114.094 H/s, GPU1 0.000 H/s, GPU2 0.000 H/s, GPU3 0.000 H/s, GPU4 0.000 H/s
17:30:48:934   1378   ZEC: put share nonce 21d
17:30:48:939   1378   ZEC round found 1 shares
17:30:48:945   283c   ZEC: 11/14/16-17:30:48 - SHARE FOUND - (GPU 0)

Does anybody have same problem?
On v3.1 all works fine with the same setup.

Anyone got problem with 280x doing 0 h/s in 5.0? Works just fine with 4.0.
I have updated drivers from 15.7.1 to latest crimson 16.11.3 - same thing.

This is a mixed with nvidia rig with 280x being the only AMD card present:

Reward is at 5.14 now, will get up to 10.0 - expect twice the price drop.

It's not working! I got same issue. When two miners working in the same time All GPU show Incorrect Data like this and half hashrate

GPU #1 returned incorrect data! 293f5d2
GPU #0 returned incorrect data! 123ada6

if i close one, the second back to normal mining.

Adaseb is famous for not knowing how to interpret numbers. I remember his screenshot claiming he got something like 8000 Sol/s on his old bone of GPU with some early Genoil miner in the early days after the launch. Therefore good luck with his trading advice.

Update to the latest drivers from AMD and remove any overclock/mods.

Thanks man -mport 0 in each miner instance solve the issue. I guessed it was needed at least in 1 of 2 miner.