Re: GridSeed 5-chip USB miner voltage mod

will this mod work with hashra controla?

The mod will work for any mining software, you just need to change the chip frequency.

Nervous to attempt, but an extra 100 khsh across 20 miners translates to an extra 2Mhsh. Anyone want to share any best practices aside from OP?

I did the 49.9k mod on all 14 of my gridseeds and I'm glad I did. I'm running CPUminer and all of my chips are stable at 1200mhz and up. The pool and CPUminer and both reporting very close to each other so I'm happy!!

Thanks for the follow up; can you list the tools/hardware you used and your new hash rate? Also if possible, anyone know the page in thus thread where I find the 49.9k mod offhand?

Go back to page 1, search for - wolfey2014 - all my posts will come up, and all shall be revealed to you Wink

Thanks Wolfey,

I'm still a bit confused though:

what's the better mod between these two below? The guy I have doing it is only familiar with 47k mod.

VMOD 3: (47k): Up to freq=1175 (500kH/s poolside average) 30 +/-4 watt
VMOD 3: (49.9k): Up to freq=1200 (510kH/s poolside average) 33 +/-4 watt

i have used 48k resistors (measured and selected from a pack of 5% 47k 1/8W resistors) to mod my pods and they are running at 1200MH/s with almost zero hardware errors with a power consumption of 25w~ per each measured with a kilowatt meter. power supply is a 850 silver.
i don't know who got this readings but its not consuming 30+ watts.

Right. 30+W sounds ridiculous if not suspicious....
Yah, 48k 5% tol is close enough I recon as long as that 5% drift doesn't go the wrong way i.e. down below 45.6k which is useless for overclocking above 950 or 50.4k which is a tad too high but not harmful to other than power consumption hence profit.
I might get lazy on this batch and do the same thing though. It's mine (punn) anyway Wink

well you have to measure and get the value you want from a pack of low precision resistors.
what you mean 5% drift?
each 47k 5% resistors will range between 45.x and 51.x when producing them, but its value is not going to be a variable value after that. each resistor will have a fixed value between 45.x and 50.x
A 48kohms 5% resistor measured by a DVM will remain 48k ohms unless influenced by temperature or other reasons. It should not be mistaken that the value varies randomly from 45k to 51k (5% difference)