Yeah, I saw that too, that's why I am wondering whether or not we need a heatsink. Wondering the same thing. Because the board is a fairly large surface area, if you keep the oil flowing using pumps, shouldnt it be sufficient? Need someone with knowledge of thermodynamics to pitch in... |
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16-Port Hub: Up to 16 hubs are provided for USB connection like printer, digital camera, card reader, MP3 player etc Fully compliant with USB 2.0 specification Backward compatible with USB 1.1 Input: 100-240V AC, 50/60Hz, 0.5A Output: 5V DC, 3A, 15W Dimension: 169 x 118 x 38mm (approx.) Weight: 310g Package Contents: Industrial USB 16-Port Hub USB Cable Universal AC adapter again 5v...... cannot run more than 8..... the anker is the best  ^ Looks like it has 2 DC input ports. Additional: AC adapter US$10.00 Makes me think that you can use 2 5V/3A adapters to get 6A meaning it can run atleast 12 most likely 16. |
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0.20
This bid was past by 1 minute 46 seconds. Winner is turtle83 @ .19 I will contact SebastianJu and have him post a BTC address for escrow. Congrats! W00t! Ill arrange the BTC in cpl of hours and wait for the address. Alright, I sent you and sebastianju a PM, he'll assign the chips to you when payment is received. Deposited into escrow. |
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Is it flat on the bottom? It the board designed for a flat aluminum heatsink on the bottom?
Yes. Its flat, designed for flat aluminium, but IMHO thermal pad is recommended. |
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Question: How easy is it to mount QFN chips?
Saw i get K1 or K16 fabbed by someone with everything on it except for the avalon chip(s). Is it easy to get get the chip mounted on it by someone? Like a repair shop or something? Someone told me all mobile repair shops deal with reworking QFN daily... is this true? Any risks involved?
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0.20
This bid was past by 1 minute 46 seconds. Winner is turtle83 @ .19 I will contact SebastianJu and have him post a BTC address for escrow. Congrats! W00t! Ill arrange the BTC in cpl of hours and wait for the address. |
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Yay auction with no minimum bid.
1 @ 1 BTC
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Btw, does anybody know if a single Avalon ASIC needs a heatsink?
Most likely, but wouldnt need a big one... especially since the PCB is much larger than usb eruptor or K1 so you already have a large surface area. Make sure to add thermal vias and large GND plate in the bottom side. After that if it runs hot just stick in a light heatsink. Its just 2 - 2.5W of heat. |
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From the looks of it, it seems that the PCB will not be able to tolerate the weight of the heatsink. They would be too heavy. The heatsink would need to be mounted on the case, and the PCB mounted on the heatsink. Your adapter idea game me a somewhat related idea. Find heatsink thats the size of a HDD and drill holes into it. The thin pcb on top of it. That should fit everywhere a HDD can go... Length of 3.5" HDD is 146mm so make it a little longer, and stick 2 K16 per heatsink. |
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For ordering full units with chips provided by you, on what date did you place your chip order with Avalon? Some evidence of that would be helpful also.
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I would really like something like that for Klondikes, but a Lancelot uses less power and has a different power plug / lead, so I don't think it would work "out of the box".
This is a complete DIY solution... where has anyone found a out of the box solution for a Klondike array being powered? Please let me know. I think you are missing what this can do... has nothing to do with the "power" of the Lancelots... have a closer look. You can make these wires yourself order some PCI-e 6 to 8 pin or SATA wires I would hope... checking now to find something. I realized, my excitement over the adapter may have been immature, so maybe we need to rethink the adapter. When i hooked up more than 5 ztex quad, overnight the ATX PSU would auto shutdown. Did not have the time to investigate why that happens. Maybe it was not designed for ~40W per lead.... Once im back home, I will try using 2 leads per board and report back if im able to max out the ATX or not. |
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how many usb block erupters can the rasberry pi handle?
it has two usb connections, so can I hook up 2 x 10 port hubs to it?
i would assume that the hard limit would be 127 *2 USB devices? depending on whether the the two USB ports are separate controllers... the 2 ports are from a single bus... |
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200 @ .17
shit just got real! turtle quits. turtle poor. |
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I searched for a cheap solution and im wondering what you think about this. And very sorry for the very poor skills in gimp...  Its based on 2 of these 2U racks: Linkhttps://i.imgur.com/LNorzrp.jpgSince each is 375mm depth i thought chaining 2 would maximize the 750mm hetzner is offering. I think they could be chained by bending the front flags that are made to mount them with screws on the colocation rack to the side and attach it to the other rack unit at the bottom. At the top i would use a metalpiece to connect both parts with screws. It should be possible to make it strong enough. If the border at the bottom end of the first rack disturbs then it could be bend too. Then i would take 2 miners. Burnin or klondike and put both heatsinks together. Then attach a fan and make something around so that the air is forced through the heatsinks and cant escape. Then put more miners after this and so on. At the end another fan like in bicknellskis image. All miners then are attached to the bottom with screws. The image shows 4 pcbs without heatsink mounted to the bottom and 2 pcbs with 2 heatsinks each put together and mounted to the bottom. Again, sorry for the bad art. Regarding the psus... 2U should be the standard height of ATX-Power supplies and those are the most cost efficient because they are widely bought and cheap produced. So i would add one or more of those at the end and put the pull fan at each minerrow a bit more to the beginning so that the airflow still is possible and the psu has enough space. I think ur thinking of 3U. 2U feels small to fit in standard ATX PSU. Even if u can cram it in, the air inlet would probably be sealed tight by the case. Its a cheap solution, the rack would cost 2 x 20€ only. 20€ if you would go the standard 37.5mm
Will this work?
Keep in mind its not only the rackspace ur renting. You are also buying electricity (and the cooling capacity to get rid of the heat). The datacenter will probably give you low power... and you would need to negotiate for more watts. But even when... how to remotely administrate it? Is one raspberry enough to run cgminer for all miners? And can this raspberry be reached from the net to change something? Maybe restart and so on? Anyone has a solution for the administration?
Maybe its even better to have 2 raspberries? One that can restart the first when it stopped working? Or is this overload and a cheaper unit could be used for this?
Linux... so ssh... Raspberry pi even has a watchdog with can make the pi reboot itself for most failures... worst case, you can ask the datacenter to power cycle your device. Some datacenters provide power strips u can power cycle remotely. 2U would be 88.9mm after standard. I checked my seasonic and i found the heigth is 86mm. I dont think the airflow will be broken too hard with it because i dont want to create a wall of psus at the end. I only want to place one or 2 psu one after another at the end of one of the middle miner-rows maybe. So that the pulling fans can still throw the air around the psus. Yes, i know about the power. In fact a full colocation rack with over 300 klondikes will have the powercost as biggest factor. Thats why i already look for countries with cheap power to search colocation hosting there. The rent itself is the lowest cost. So regarding the raspberry... you say one unit could be enough for one 2u-rack? Or even the whole colocation rack maybe? And it would be possible to check over the net how everything works? Is this safe then or might someone be able to attack from the net and do something bad to the miners? I dont have a clue how this would work. The pi is probably one of the cheapest components in the setup... In theory it could possibly run the entire rack... but id suggest maybe put 1 pi per case.. or something. This needs testing how many K16s can single pi handle... It boils down to distributing the risk by having multiple isolated systems vs one large system. Nothing is safe. Everything that can break will break. Everything that can be attacked will be attacked, use your own judgement. I would say if setup correctly the odds of being pwnd is greatly reduced. Seems like you need to wait for someone to make raspberry pi image for k16 (maybe minepeon or something) and trust they did the right thing. |
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I searched for a cheap solution and im wondering what you think about this. And very sorry for the very poor skills in gimp... Its based on 2 of these 2U racks: Linkhttps://i.imgur.com/LNorzrp.jpgSince each is 375mm depth i thought chaining 2 would maximize the 750mm hetzner is offering. I think they could be chained by bending the front flags that are made to mount them with screws on the colocation rack to the side and attach it to the other rack unit at the bottom. At the top i would use a metalpiece to connect both parts with screws. It should be possible to make it strong enough. If the border at the bottom end of the first rack disturbs then it could be bend too. Then i would take 2 miners. Burnin or klondike and put both heatsinks together. Then attach a fan and make something around so that the air is forced through the heatsinks and cant escape. Then put more miners after this and so on. At the end another fan like in bicknellskis image. All miners then are attached to the bottom with screws. The image shows 4 pcbs without heatsink mounted to the bottom and 2 pcbs with 2 heatsinks each put together and mounted to the bottom. Again, sorry for the bad art. Regarding the psus... 2U should be the standard height of ATX-Power supplies and those are the most cost efficient because they are widely bought and cheap produced. So i would add one or more of those at the end and put the pull fan at each minerrow a bit more to the beginning so that the airflow still is possible and the psu has enough space. I think ur thinking of 3U. 2U feels small to fit in standard ATX PSU. Even if u can cram it in, the air inlet would probably be sealed tight by the case. Its a cheap solution, the rack would cost 2 x 20€ only. 20€ if you would go the standard 37.5mm
Will this work?
Keep in mind its not only the rackspace ur renting. You are also buying electricity (and the cooling capacity to get rid of the heat). The datacenter will probably give you low power... and you would need to negotiate for more watts. But even when... how to remotely administrate it? Is one raspberry enough to run cgminer for all miners? And can this raspberry be reached from the net to change something? Maybe restart and so on? Anyone has a solution for the administration?
Maybe its even better to have 2 raspberries? One that can restart the first when it stopped working? Or is this overload and a cheaper unit could be used for this?
Linux... so ssh... Raspberry pi even has a watchdog with can make the pi reboot itself for most failures... worst case, you can ask the datacenter to power cycle your device. Some datacenters provide power strips u can power cycle remotely. |
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Bear with me here, I'm not much of a hardware guy. I ordered one of these, thinking it was powered via the USB dongle.
Alas, it is not so - how in the world am I supposed to power this fricken thing?
Easy option. Buy a 12V > 4A power adapter. The ones that look like laptop charger... You can get it from ztex direct : http://shop.ztex.de/product_info.php?cPath=21_24&products_id=71 Or buy cheap made-in-china ones. |
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Does one have to build such cases or is it prebuilt to buy somewhere? I probably dont get where to find such things or how they are named. I assume the designer's goal was to build it themselves. If i needed to stuff them in cases, what id do is goto a shop selling second hand equipment (plenty of large shops selling used computers (p2/p3/p4), audio/video equipment, etc almost at scrap value) , and find some case that roughly matches the width and is off appropriate depth. 5 years ago i bought some pentium 4 computers for office at ~$60 each ... i am still harvesting them for fans/wires/etc... |
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