[Troubleshoot] ASICMINER Cube : HIGH Clock - 1 Card - 1 Bank (8 chips) - x'd
Howdy,
Has anyone run into the problem described below and found a solution?
Apart from fixing the issue, it would be great to actually understand what is happening.
Any reference or troubleshooting type urls for this sort of situation would be super and fantastic.
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Item: ASICMINER Cube
Area of Impact: 1 card only
Problem:
Card functions fine at LOW clock however at HIGH clock the second bank of 8 chips are all x'd up (ooooooooxxxxxxxx).
The issue occurs no matter what slot on the backplane the board is installed.
The cube was run with just the 1 card during my testing.
All other boards run at HIGH clock just fine.
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I have seen a similar problem mentioned here: https://bitcointalk.org/index.php?topic=307095.msg3871818#msg3871818
It's 8 all together on the right side. Anything I can do? It's hashing at ~34.1Gh/s now btw.
The possible issue mentioned by sidehack was "voltage underrun in the bank's VRM". These words make sense to me but I do not know what steps to take to remedy it. I have searched for forum and interwebs and have not succeeded in finding a solution.
All my attempts to solve the issue have focused on heat dissapation and PSU power
What I have done so far:
Much obliged.
(Why do I want to understand this issue?....
"Curiosity, I guess. Heck, I'm curious like a cat. I have a couple of friends that call me whiskers." - Harry Caray)
((as portrayed by Will Ferrell [https://www.youtube.com/watch?v=7_0ava_MSSw]))
Has anyone run into the problem described below and found a solution?
Apart from fixing the issue, it would be great to actually understand what is happening.
Any reference or troubleshooting type urls for this sort of situation would be super and fantastic.
------------------------------------
Item: ASICMINER Cube
Area of Impact: 1 card only
Problem:
Card functions fine at LOW clock however at HIGH clock the second bank of 8 chips are all x'd up (ooooooooxxxxxxxx).
The issue occurs no matter what slot on the backplane the board is installed.
The cube was run with just the 1 card during my testing.
All other boards run at HIGH clock just fine.
------------------------------------
I have seen a similar problem mentioned here: https://bitcointalk.org/index.php?topic=307095.msg3871818#msg3871818
Quote
One actually hashed slower in High mode: Low: ~32Gh/s High: 29Gh/s. Now it's running at 33.5Gh/s (now most likely limited by one card that has 8 X's on High)
Is it 8 scattered X, or 8 together? Probably an undervolt condition on that bank's VRM; I can think of a few possible causes most of which I could probably fix for you.The possible issue mentioned by sidehack was "voltage underrun in the bank's VRM". These words make sense to me but I do not know what steps to take to remedy it. I have searched for forum and interwebs and have not succeeded in finding a solution.
All my attempts to solve the issue have focused on heat dissapation and PSU power
What I have done so far:
- Run cube with only the 1 problem blade with an older 700w PSU
- Run cube with only the 1 problem blade with a newer 860w PSU
- Removing and replacing the heat sink
- Inspecting board for visibly bad compenents or solder bridges
- Making a thermal paste sandwich. (Heat sink | paste where chip is | thermal pad |paste where chip is | chip backing.)
src: https://bitcointalk.org/index.php?topic=310752.msg3732017#msg3732017[\li]
Much obliged.
(Why do I want to understand this issue?....
"Curiosity, I guess. Heck, I'm curious like a cat. I have a couple of friends that call me whiskers." - Harry Caray)
((as portrayed by Will Ferrell [https://www.youtube.com/watch?v=7_0ava_MSSw]))