Im getting around 300 khash/s on my r9 290... seems rather low to me.  

Specs;
16GB mem
intel 4670K OC'd @ 4G
win 8.1 64bit
Catalyst 14.1 (beta)
R9 290 -> core 1000mhz / mem 1400mhz with MSI afterburner

Start.bat:
GPU_MAX_ALLOC_PERCENT=100
sgminer -o stratum+tcp://pool.darkcoin.io:3333 -u Crybaby84.D1 -p x -k darkcoin -I 18 -g 4 -w 128
pause


Any tips to bring it up to speed   ? Is it the catalyst beta treading me bad?  Thanks!

EDIT Shuting down afterburner and reboot gave me 2.4 Mhash/s. Problem solved !!