Hey everyone, Just wanted to report back on my 10 miners from gaw,
2/10 did not work out of the box,
1 had clamped the fan wires and shorted everything out when I plugged it in. - Fixed this by repairing the fan wires
1 hashed, but nothing got accepted - fixed this by reflowing the solder with a heat gun... hashing like a champ now.
I modded 4 with the 49.9K resistor, and was running them averaged 1225mhz stable / average 507 khash and found the heat and power consumption excessive - 29ish watts when pods were hot.
I now have modded all to with a 47K resistor and total mhz average after tuning is 1190mhz / 501
47K vs 49.9K Comparison:
Hashrate Ave. Watts MHz (ave after chip tuning) hash /Watt
47K 501.65 20-22 1190 22.8
49.9K 507.6 28-29 1225 17.5
My definitive Thoughts
-Use a 47K resistor - the extra heat / power management is not worth the minimal hashrate increase.
-use sandor111's cpuminer
-No HW errors does not mean your miner is running optimally, some gridseeds will run slowly at clocks that are unstable, but not throw HW errors.
-use autotune for debugging and testing max frequencies of chips, but lock them in manually in your config script.
Right, but keep in mind:2/10 did not work out of the box,
1 had clamped the fan wires and shorted everything out when I plugged it in. - Fixed this by repairing the fan wires
1 hashed, but nothing got accepted - fixed this by reflowing the solder with a heat gun... hashing like a champ now.
I modded 4 with the 49.9K resistor, and was running them averaged 1225mhz stable / average 507 khash and found the heat and power consumption excessive - 29ish watts when pods were hot.
I now have modded all to with a 47K resistor and total mhz average after tuning is 1190mhz / 501
47K vs 49.9K Comparison:
Hashrate Ave. Watts MHz (ave after chip tuning) hash /Watt
47K 501.65 20-22 1190 22.8
49.9K 507.6 28-29 1225 17.5
My definitive Thoughts
-Use a 47K resistor - the extra heat / power management is not worth the minimal hashrate increase.
-use sandor111's cpuminer
-No HW errors does not mean your miner is running optimally, some gridseeds will run slowly at clocks that are unstable, but not throw HW errors.
-use autotune for debugging and testing max frequencies of chips, but lock them in manually in your config script.
not all miners are the same hence your comparisons do not apply in general to all.
And, the watt/heat is not excessive w/49.9k. At least not with my pods.
I wonder what Gridseed has changed since the first mods were done on these things?
We know their quality control leaves quite a bit to be desired.
I'll be glad when I don't have to do diddly with my miners anymore. Just buy them, mine them, make them pay off ROI and profit from then on! BIG TIME!
