Powercolor 7870 LE (Tahiti) - NEED HELP! - page 3.

host yourpool.com ### Do not add http://!!
port 8344
user username
pass password

protocol litecoin

worksize 256
vectors 1
aggression 20
threads_per_gpu 1
sharethreads 32
lookup_gap 2
gpu_thread_concurrency 18610

Ok guys. I'm setting up a rig for a buddy I work with and I'm about to throw the damn Powercolor cards out the window.

Specs:
A6-5300
Asrock extreme 6
4gb of ddr3
1000 watt OCZ gold
and 2 or 3 Powercolor 7870 tahitis

Problem:

No matter what settings I use I cannot get the cards to mine over 330kh/s. The cards are voltage locked so I can't adjust that. Stock clocks are 925 core and 1500 mem.

example cgminer .bat:

cgminer --scrypt -o http://litecoinpool.org:9332 -u x -p x --lookup-gap 2 --thread-concurrency 8192 -g 2 -I 13 -w 256

This is stable and gets me 330kh/s any intensities over 13 cause massive hardware errors

if I try:

cgminer --scrypt -o http://litecoinpool.org:9332 -u x -p x --lookup-gap 2 --thread-concurrency 16384 -g 1 -I 13 -w 256

cgminer won't start

basically nothing I try will get these cards to run... To boot, they artifact if turned up to the first setting listed above.

I've tried them on my test bench and get the same results. I tried reaper and got shutdowns, false starts at settings that would give good kh/s.

Should I just return all these cards? ( I have 4 of them)

Thanks for any help you can give.

Topic: Powercolor 7870 LE (Tahiti) - NEED HELP! - page 3. (Read 14100 times)