I got my HD7870 MYST Edition from Newegg today. It took some work, but I finally consistently over 400kH/s using reaper with this card without crashes or high number of invalids.

Using AMD Overdrive section of Catalyst 13.3beta - Set GPU clock to 855MHz, Memory 1500MHz. There may be better values. This worked for my setup.

I also had to edit a couple lines in reaper.conf

Code:

kernel reaper.cl
save_binaries yes
enable_graceful_shutdown no
long_polling yes
platform 0
device 0

mine litecoin

Finally, here is my litecoin.conf

Code:

host notroll.in
port 6332
user user.1
pass 12345

protocol litecoin

worksize 256
aggression 18
threads_per_gpu 1
sharethreads 24
lookup_gap 2
gpu_thread_concurrency 16384

I get a steady hash rates >400kH/s. You can increase the aggression to 19 or so to increase the hash rate slightly. For me any other cpu_thread_concurrency value seemed to cause either hardware errors or invalids.

I got similar has rates with cgminer by setting using the following command line arguments, but it wasn't communicating with the pool correctly for some reason. For now, I am sticking with reaper.

Code:

cgminer --scrypt -o http://notroll.in:6332 -u user.1 -p x --shaders 1536 --intensity 18 --worksize 256 -g 1

If this works for you, great. Feel free to send that 10ltc bounty my way Grin

If anybody finds a better configuration. I'd love to see it.

DrBiTC

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