Quote from: randywald on April 24, 2014, 07:25:27 PM

What kh/s are normal for R9 270, 280X, 290 and 290X? That would be very useful for me because my R9 270 did only about 20-25 kh/s as i tested it the last time. Thank you! :-)

See comparison with scrypt here:
https://litecoin.info/Mining_hardware_comparison

As you can see 270 gives about half what 290X gives at it's best. My 290X is giving 50 khash with the current n-factor so yours looks good. However, those results could always be improved. You can find suitable memclocks from the link above also and you may want to use AMD Catalyst for tuning. There are a lot of Litecoin related tutorials that could be applied to microCoin as well. DuckDuckGo is our friend here.

Please post your config if you managed to find some improved values.