I am GPU mining using my new R9 280x (20hpm) and yes, It does make about 27MMC per day, despite the huge change in difficulty decreasing my expected reward by about 30-40% with its variations.
How do you get 20hpm with the 280x? I have a Gigabyte R9 280x and I only get about 18 hpm. I am on Windows 7 x64 with my engine at 1100, memory @ 1500 and Powertune +15%. Any hints to improve my hashrate? Thanks.
Edit: And I'm not using my desktop for anything else.