Is there any way to tell which Gridseed is not running at maximum speed using Sandor's cpuminer? For example, in this screenshot:
Gridseed #1 is running really slowly, which probably means that I need to either re-seat the heatsink or resolder the resistor. However, how do I determine which one is Gridseed #1? When I unplug the USB cable to a Gridseed, the UI doesn't update to let me know that it's dead, and every Gridseed looks like it's still hashing.
Try using cgminer to see if it still shows a slow hashrate. I found cpuminer 0.9a would sometimes report the wrong hash rate. Also, it was causing one of my miners (new one with LED lights) to continuously light up red. Not sure if that was the same one reporting a slow hashrate.