what miner are you using ? you should underclock the memory to -502 because skunkhash is not memory intensive and just overclock the core to +75 or +100, pl 100% .. depending on your specific card. Be sure you have the virtual memory set to 25GB or so and you can try again with intensity 25
miner from off.site
virt memory - 30gb
with your settings (mem -502 and core + 175) 13 mgh
ps change miner to
https://bitcointalk.org/index.php?topic=770064.0now 18-20. Thanks for help!
pps is any profit in solo mining will be with 40mgh or pool only for two cards?