No problem.

You can try to play also with other settings to optimize your graphic card for better hashrate results.

How much do you get with your AMD cards?

Zcash
280x 200 h/s
290x 295 h/s
Ether
280x 17 mhs
290x 29 mhs
l you ?
You have quite good results with your cards.
I have GTX 760 and Intel i5-4670 with 16gig RAM. It wasn't (obviously) build for mining purpose, but since I have fixed electricity fee I let nicehash running on it.
On cryptonight algorythm I get:
GPU: 230 H/s
CPU: 120 H/s
+ I let running nicehash on my laptop as well, which is another 100 H/s with CPU
which can gain me from 0,5 to 0,8 usd a day - depends on current profitability.
I know won't get rich with my rig, but for fun and for collecting few satoshi, it is just fine.
