Quote from: burgergold on December 28, 2013, 03:08:16 PM

I've just installed a 280x (ASUS R9280X-DC2T-3GD5)
Running on Windows 7 with Catalyst 13.12
Using cgminer 3.7.2 with the following options: -I 13 -g 2 -w 256 --thread-concurrency 8192 --shaders 2048
Tried intensity 15 yesterday and had a few HW errors, tried it again today without HW errors but does not increase the hashrate (even tried 20 this morning, computer is mostly unusable and hashrate still around 600)
GPU clock at 1070mhz, GPU memory clock at 6400mhz, temp at 82 celsius
Any idea to increase the hashrate up to 700-800?

Same here, I bought 9 R9 280x and setup 3x3 gpu miners and I'm only getting 610khash per gpu. Intensity 14 or more gives me HW nonce errors, so I'm mining all at I13, tried different drivers and cgminer versions too, but nothing change.

The only thing I was able to change is the TC I'm using 10240 instead of 8192, but can't go over 10240, the GPUs are OC'ed at Engine 1150 and Memories 1750.

Actually I'm mining EAC, CAT and TRK on each one of them.