i have a miner with one 7950 in it. my miner mines for a while then crashes or the display adapter stops responding in windows 7.

c:\x11\sgminer.exe --kernel darkcoin -o stratum+tcp://pool.ipominer.com:3335 -u rodneycrypto.1 -p x --thread-concurrency 8192 -I 12 --lookup-gap 2 --worksize 64 -g 2