I can't recall if I saw the issue I'm having before on this post but searching hasn't yielded any results.
One of my Compacs has been running for about 10 days straight, more or less in a group of five. I've kept them at 150MHz until about 2 days ago and ramped them up first to 160MHz and the 170MHz the following day. After showing HW errors at 0.01% in about 4 hours I went back down to 165MHz where they ran for another 14 hours or so.
When I checked again at that time, HW errors was in the K range and steadily climbing. CryptoGlance showed the Compac hashing at a rate over 100GH/s and the status light on the Compac was rapidly flashing.
Initially after pulling the Compac from the USB hub I have found the voltage at 4.99 - 5.00, current draw at 0.22 amps, and V/Core at 0.630V when on standby. Plugging it back into the hub with cgminer running, the status LED continues flashing rapidly with HW errors at a corresponding rate. I tried turning the V/Core pot down as well as up to approximately 0.750V with no change.
I was wondering first if there is anything physical I can try and look at and failing anything simple and/or obvious, if I could send it in for inspection and possibly repair?
Thanks in advance.
One of my Compacs has been running for about 10 days straight, more or less in a group of five. I've kept them at 150MHz until about 2 days ago and ramped them up first to 160MHz and the 170MHz the following day. After showing HW errors at 0.01% in about 4 hours I went back down to 165MHz where they ran for another 14 hours or so.
When I checked again at that time, HW errors was in the K range and steadily climbing. CryptoGlance showed the Compac hashing at a rate over 100GH/s and the status light on the Compac was rapidly flashing.
Initially after pulling the Compac from the USB hub I have found the voltage at 4.99 - 5.00, current draw at 0.22 amps, and V/Core at 0.630V when on standby. Plugging it back into the hub with cgminer running, the status LED continues flashing rapidly with HW errors at a corresponding rate. I tried turning the V/Core pot down as well as up to approximately 0.750V with no change.
I was wondering first if there is anything physical I can try and look at and failing anything simple and/or obvious, if I could send it in for inspection and possibly repair?
Thanks in advance.
On what kind of hub and what kind of power going in to it?
At 0.22 amps (USB 2.0 should be ~0.500 amps, so your less than half, USB 3.0 should be ~0.900 amps), so it's more than likely power (or the lack of it) causing your problems. Probably when you started ramping up the MHz, it pushed the hub past what it could handle.
However, sometimes, but not always, five work. In my experience it works depending on stick arrangement on the particular Superbpag hub-for example three in a row, gap, fourth, gap, fifth, on mine. But it not always work. Sometimes it works if you put four initially, let them stabilize, then sneak in the fifth one.
Also, make sure to separate sticks from each other by a piece of plastic (I simply used an old store card or old library card without magnetic strips, but this point might not matter). Otherwise, sticks touch each other in the hub and I am not sure that there is no interference.
TL;DR: five can work at default speed, but four are typically more stable on Superbpag.
