I was bit surprised when after modyfing cubes per youtube video (anyone did put heatsink on all DC converters?) and applying new thermal paste I managed to get my problematic dies to work at full spead. I had 2 that would run at 125mhz max. now they running at full 300mhz (didnt tried more).
and was shocked how dried up thermal paste was on some cubes:/
btw anyone ever tried to put some water cooling?
Boy that's interesting! Nice job, what were the symptoms before re-pasting the dies?and was shocked how dried up thermal paste was on some cubes:/
btw anyone ever tried to put some water cooling?
I just took out about 50% of the hog on a board that was kind of shaped like a taco chip with all dies dead. After a reflow and gentle torquing of the board to remove the sag, I have two dies are running at full speed, and the other two put out a lot of noise and fail (so they have to be disabled). The source of the hog was probably having the heat sink screwed down way too tight (don't do this).
The remaining two do the "mumble" error when powered on, in BFGMiner you see tons of shares without requests coming in on all four dies, making the unit hash slowly. Still pulls full power on the dies, but garbage output. Turning off the dies makes the remaining two stable at 300mhz/40mh.
Edit: This is an example of the gibberish message:
[2016-03-14 21:33:38] KNC 1b[5:2:76]: Got nonce for unknown work in slot 5
As to water cooling I tried a Corsair H100 on a KNC Neptune. Worked great in terms of keeping the CPU cool, right up to when the unit leaked and vented the coolant with a foom. Oh well.
Yeah, I could never come to fully trust water cooling. Had some running great on 6 hashfast boards for as long as I was mining on them. But still... one small leak and its all fucking done.
Inside PC cases Im even more paranoid using water cooling ... I dont wanna destroy my computer ... lol!
Ive been using this computer for about 4 years now and I have never had a leak
