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Showing 3 of 3 results by captain-v
Got my second October 4VRM Jupiter in and on first bootup worked fine for a few hours. I updated to 1.0 to test and I noticed when I turned off SPI Auto this:
http://i.imgur.com/YskroHj.jpg
I've tried the hit it with SPI 3.3 and max voltage. Let it run a few hours like that. I have had them drop when OC to high but this I can't seem to rescue.
http://i.imgur.com/Fcg0xqb.jpg
There is it at max voltage on that one. I've swapped back to .99.1 , .99.2 and 1.0 and can't seem to get it to jump back up.
I've tried running 231 and 221 but sadly nothing helped kick that one up even.
Any other suggestions so I can put this Jupiter to a happy #
http://i.imgur.com/YskroHj.jpg
I've tried the hit it with SPI 3.3 and max voltage. Let it run a few hours like that. I have had them drop when OC to high but this I can't seem to rescue.
http://i.imgur.com/Fcg0xqb.jpg
There is it at max voltage on that one. I've swapped back to .99.1 , .99.2 and 1.0 and can't seem to get it to jump back up.
I've tried running 231 and 221 but sadly nothing helped kick that one up even.
Any other suggestions so I can put this Jupiter to a happy #
I've been having the same problem until today on my O S+1. Now SPI @3.3V and die1 with -0.0806V and 675MHz made it work. I was getting higher rates with 231 around 450GH/s. Now with all other dies @775MHz total close to 425GH/s with less errors.... Also with all other dies at -0.1465V, power dropped from 560W (w/ Stock values) to 460W at the wall.
Is there a way to 231 the other ASICs and leave this slepy die1 on ASIC alone @675MHz?
Quote
"What temps do you get on the chip itself? From the web interface and from your readings? And what hash rate do you get per board?
If there is a better way to cool the down side of the VRMs, we'd be able to achieve better performance, any ideas?"
If there is a better way to cool the down side of the VRMs, we'd be able to achieve better performance, any ideas?"
@Redbluebg
Well OC 231 in the ~23C ambient on stock settings WI ASIC temps are below 48C ( w/ ~175W DC, ~165 GH/s per ASIC, 1.23W per GH/s and ~2.5% Reject + HW ...)
At this time I think forced air is most practical method to cool the VRMs. And it would be good to keep them dust free with brushes and pressurized air. Also keep/aim away the PSU so it doesn't blow hot air near the miner. I am direct driving with the PSU (HX750) cables to save on power loss and heat generation on the miner cables.
Immersing VRMs in oil bath (in synthetic Mobil1 0-20W
) may be an alternative for some of us 
but not sure if it will accomplish much...BTW, I thank to all those who help opening the KNC OC doors to us
Here is how I have moved my fans, their are strapped with zip lock to the PCIe cables, temperature dropped with almost 20 degrees, now running under 40 degrees overclocked to 211, getting 485 GH/s. 231 and 251 are not working very good for my miner
http://i.imgur.com/yXdBhzT.jpg
http://i.imgur.com/aXkBuLb.jpg
http://i.imgur.com/yXdBhzT.jpg
http://i.imgur.com/aXkBuLb.jpg
Below are the images from OCT 4 VRMs with fans blowing about 45 Degree to the boards like Redbluebg doing. Running 231 with stock settings...
http://i.imgur.com/fLwkotI.jpg
http://i.imgur.com/jFLMBXt.jpg
Based on these images I am not sure if adding heatsinks to VRMs be really beneficial. There is a danger of reducing the air flow in areas really needs cooling.
Does anyone know where is the temperature sensor for the ASICs?
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