I am giving out 0.6BTC to the first to get his Gridseed miner stable at 1100 MHz (<10 HW error in 24h) and post the steps to mod the miner. So far I have managed to get it stable at 1013 MHz, but I feel we can push it further.
I have found the only way to push these further is by replacing the 36k resistor with a higher one and playing with PLL voltage, you need to lower the resistance of R211 or R212 by tracing it with a pencil. Measure the voltage across both resistors and it should be around 1.1v total. If you want to increase PLL voltage, trace R212, to decrease it, trace R211 (go back and forth atleast 10-20 times or you will not notice a change). Simply use an eraser to revert the mod. Personally 1.05v seems sweet spot.
Disclaimer: as always, I am not responsible for damage to your miner, do this at your own risk!
I have found the only way to push these further is by replacing the 36k resistor with a higher one and playing with PLL voltage, you need to lower the resistance of R211 or R212 by tracing it with a pencil. Measure the voltage across both resistors and it should be around 1.1v total. If you want to increase PLL voltage, trace R212, to decrease it, trace R211 (go back and forth atleast 10-20 times or you will not notice a change). Simply use an eraser to revert the mod. Personally 1.05v seems sweet spot.
Disclaimer: as always, I am not responsible for damage to your miner, do this at your own risk!
What is the test point on the card for checking/monitoring the voltage?
Thanks
Wolfey2014
Core voltage can be measured across the 36k, assuming it's voltmodded (by default it would be the 33k)
PLL voltage can be measured across R211 and R212.
Thank you.
What does PLL stand for, again? I'm a bit rusty on some terminology.
Wolfey2014