I did the pencil mod using an 8b pencil and the lowest I could get the resistance was around 330. voltage at load went up to 1.30-1.31 from 1.28. However this got me virtually no increase in clocks. My max core went up only 10 mhz and then cod4 started freezing until I removed all overclocks even though it was stable at my previous max clocks the day before. Weird.