hi guys , I've tried to mod R1 and R2 to the value of 10k and 4.99k according to the instruction for ocing, but unsuccessfull.  My 2 ants oced at 2gh to start out with but then they start to droped after 5 minutes of start up to the lower hashing rate, less than 1 gh.  I did have a fan on them with no heatsink though, the ants were really hot.   Without success so I  decided  to change R1 and R2 back to the way they were, but now my hashing rate stay about 1.54gh and 1.58gh at oc 0981.   What have I done wrong here, thanks for your help in advance.