The 10 I modded yesterday seem to be rock solid at 938Mhz. I have pushed the non-modded ones as far as I can without too many HW errors. I will solder the rest if these are stable through the weekend.
I also used the --usb :50 command to break them up into 2 groups of 50 miners so I can see them all.
I also used the --usb :50 command to break them up into 2 groups of 50 miners so I can see them all.
Okay, cool! Nice work!
I modded one of mine last night. Solder bridged 2 of the resistor blanks as shown earlier by the original modder. This increases core voltage a tad, I believe. And I think that's all you can safely increase it to.
I haven't tried replacing the resistor with a 38K or the pencil track mod trick yet.
That's for PLL voltage adjustment as I understand it, without delving into the schematic etc. myself.
Is this what you did too?
As for your fine tuning to an odd step of 938Mhz, how did you accomplish this?
I'd like to do the same thing.
Mine is rock steady at 900MHz but at 950Mhz being the next allowed step in cpuminer throws enough HW errors to turn me off to it. So for now. it's 900Mhz which is giving positive results at the pool. $$$
Wolfey2014
If you use https://github.com/dtbartle/cgminer-gc3355, you can specify pll_r, pll_f, and pll_od as part of gridseed-options; you can use https://gist.github.com/dtbartle/5319985b29b7f78c3993 to generate all possible combinations of these, and their resulting frequencies.