s1gs3gv
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Activity: 1316
Merit: 1014
ex uno plures
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July 05, 2014, 12:41:25 AM |
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He mentioned a 90 degree cooling system fitting that failed in an earlier post.
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xstr8guy
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July 05, 2014, 01:58:26 AM |
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He mentioned a 90 degree cooling system fitting that failed in an earlier post.
Cheers, thanks. To be honest, I didn't understand anything else in that post either, lol. Way over my head! |
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aasl
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July 05, 2014, 03:02:31 AM |
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Good news guys. I have reduced my VRM temps by 20 degrees C with my new delta fan:
Heres a comparison with the other cubes that still have the stock fans:
Only problem is that it sounds like a Boeing 747 but i would rather be deaf than having burnt VRMs.
How much CRM for the delta fan? It is used to blow the cold air in right? I thought there is a fan inside the box? Its 240 CFM. http://www.newegg.com/Product/Product.aspx?Item=N82E16835213001&cm_re=delta_120mm_fan-_-35-213-001-_-ProductThere stock 120mm fan was mounted on the inside but I removed that and had to mount the delta fan on the outside because the delta fan is thicker and wont fit on the inside. Also I had to use a 120mm to 140mm fan adapter which also adds thickness. Thats why it looks so bulky in the pic. It blows air into Neptune. thank you for the reply! do you have any idea how much cpm the stock 120mm fan has? |
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ilovethebtc
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Activity: 61
Merit: 10
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July 05, 2014, 05:00:30 AM |
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Good news guys. I have reduced my VRM temps by 20 degrees C with my new delta fan:
Heres a comparison with the other cubes that still have the stock fans:
Only problem is that it sounds like a Boeing 747 but i would rather be deaf than having burnt VRMs.
How much CRM for the delta fan? It is used to blow the cold air in right? I thought there is a fan inside the box? Its 240 CFM. http://www.newegg.com/Product/Product.aspx?Item=N82E16835213001&cm_re=delta_120mm_fan-_-35-213-001-_-ProductThere stock 120mm fan was mounted on the inside but I removed that and had to mount the delta fan on the outside because the delta fan is thicker and wont fit on the inside. Also I had to use a 120mm to 140mm fan adapter which also adds thickness. Thats why it looks so bulky in the pic. It blows air into Neptune. thank you for the reply! do you have any idea how much cpm the stock 120mm fan has? I typo-ed. The stock fan that comes with the Neptune is a 140mm fan with 122 CFM. This is the stock fan: http://www.newegg.com/Product/Product.aspx?Item=N82E16835345069&cm_re=140mm_fan-_-35-345-069-_-ProductI couldn't find many 140mm fans with more than 122 CFM so thats why I got 120mm delta fans. |
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samsonn25
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July 05, 2014, 05:12:43 AM |
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A 140mm fan would need to spin higher than 2000 rpm. There are not many out there.
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ilovethebtc
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Activity: 61
Merit: 10
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July 05, 2014, 05:49:30 AM |
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Im not too impressed with the airflow on that Noctua. Its only about 20% more airflow than the stock fan that comes with the Neptune. I require at least 200+ CFM.
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rograz
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July 05, 2014, 06:06:44 AM |
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ye the low airflow is the curse of x25mm fans, a personal favorite is the Silverstone SST-FHP141. It has the same airflow as the noctua but at 2000rpm since it's x38mm (only thick 140mm fan I've managed to find) It's virtually inaudible compared to the crazy delta fans, then again so is a yet engine ;P
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samsonn25
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July 05, 2014, 12:24:32 PM |
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5200 rpm. Damn
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NEO2012
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July 05, 2014, 02:34:47 PM |
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Looks like a time-machine. yeah is u john titor? |
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user27
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July 05, 2014, 05:37:06 PM |
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As I understand it to cool Neptune VRM's there is a poorly manufactured aluminum plate in the form of an "E" with the outer legs on the VRM's and the middle leg holding the heat sink in place.
There is some kind of thick heat foam between the VRM's and the plate to transfer the heat to the plate but then where does the heat go? Is it dissipated by the metal plate or is it thermally bonded to the top of the heat pipe sink?
Thanks
The VRM heat goes from VRM -> foam -> plate -> some radiates off the plate some may transfer down from the plate into ASIC heatsink but that would depend on temperature of each part. The heat only goes to cooler places, if the base of heatsink is hotter than the plate(not VRM temp BTW) it will warm it(plate) too. (second law of thermodynamics??) If the 'heatsink base' is cooler than the plate, adding a dab of grease between plate and heatsink would help. Else the ASIC will contribute to VRM temp issues. Would need to attach thermocouple to a small probe and measure plate and base of heatsink to 'know'. The plate is WELL MANUFACTURED. They are almost perfectly flat. Turns out IMneverHO that flat is not ideal. I bend the ends of the outer legs down for better contact of plate/foam/VRM. Easy no parts needed improvement in VRM temps! You can look at imprint in foam and determine where it needs more pressure. It can be done without unsticking heatsink from ASIC if you bend the fan back and carefully pry plate up from VRM's. The foam acts like doublesided tape. It's more like clay or plumbers putty than foam. I also squeezed the foam/clay a bit to make it taller before reinstall of plate. YMMV  EDIT there is also foam below PCB under same challenged VRM's. Raising cubes up a bit will help bottom of case radiate some of the heat. The whole foam thing is an OK idea but poorly implimented. Thanks, fairly sure I know what to do when / if they arrive now. Shame KfC have to date refused to either refund or dispatch miners. u27 |
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opentoe
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Activity: 1274
Merit: 1000
Personal text my ass....
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July 05, 2014, 06:10:33 PM |
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A 140mm fan would need to spin higher than 2000 rpm. There are not many out there.
Take out the large, ridiculous fan and replace it with 4 small little fans. Your options on those size fans are limitless. |
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rograz
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July 05, 2014, 06:33:53 PM |
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A 140mm fan would need to spin higher than 2000 rpm. There are not many out there.
Take out the large, ridiculous fan and replace it with 4 small little fans. Your options on those size fans are limitless. not really an improvement since 60mm fans cap out at 60ish cfm and I dont think there are that many 70mm fans around. |
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user27
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July 05, 2014, 06:38:20 PM |
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A 140mm fan would need to spin higher than 2000 rpm. There are not many out there.
Take out the large, ridiculous fan and replace it with 4 small little fans. Your options on those size fans are limitless. I have a bunch of fast 120mm fans from my old 132nm setup; they allowed me to o/c by 50% back then so fingers crossed they will do the job when/if KfC ever send me miners. Really don't want to be spending a lot of cash on cooling these given that ROI is already a distant glimmer. |
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opentoe
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Activity: 1274
Merit: 1000
Personal text my ass....
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July 05, 2014, 06:39:01 PM |
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A 140mm fan would need to spin higher than 2000 rpm. There are not many out there.
Take out the large, ridiculous fan and replace it with 4 small little fans. Your options on those size fans are limitless. not really an improvement since 60mm fans cap out at 60ish cfm and I dont think there are that many 70mm fans around. Then its dremel time. May as well have the one whole side of fans. |
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Rawbit
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Activity: 53
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July 05, 2014, 07:36:00 PM
Last edit: July 05, 2014, 08:28:25 PM by Rawbit |
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Hi, My controlboard needs to be flashed (blank screen and ASICS are not recognized). But when I unzip https://www.kncminer.com/userfiles/file/SD_Neptune_rc6.zip to SD card and start controlboard with this card it just won't boot/flash (no green led). Is there another way to flash it? I'm able to log in to BBB via ssh or GUI. Best regards |
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Powell
Sr. Member
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Activity: 486
Merit: 262
rm -rf stupidity
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July 05, 2014, 08:20:11 PM |
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Has anyone ever removed the ASIC itself from the Jupiter boards? I thought getting everything off the back off the board where it is mounted would help but no go on that one.
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Phoenix1969
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Activity: 938
Merit: 1000
LIR DEV
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July 06, 2014, 04:50:49 AM |
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Hi, My controlboard needs to be flashed (blank screen and ASICS are not recognized). But when I unzip https://www.kncminer.com/userfiles/file/SD_Neptune_rc6.zip to SD card and start controlboard with this card it just won't boot/flash (no green led). Is there another way to flash it? I'm able to log in to BBB via ssh or GUI. Best regards shouldn't you be flashing rc9? |
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