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robix
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June 18, 2013, 07:09:40 AM |
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I'm planning to make stacks of 12 boards. I've chosen a OCZ ZX850W PSU. It's a single rail with max. 70A at +12V. It has 4 PCI-e connectors, so I can connect to 4 boards. From each of this boards I'll daisy chain to 2 other boards by the terminal block. Power should be sufficient. The PSU should operate in its efficient range, and the current on the single wires is not too high.
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g83
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June 18, 2013, 07:25:37 AM |
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so you need 3 of those to run up to 36 boards ?
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BenTuras
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June 18, 2013, 07:32:24 AM |
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I was also busy with the power cables. It isn't that easy to find PCI splitter cables, but I found these: http://www.alibaba.com/product-gs/491429885/Y_splittler_power_extension_cable.htmlminimum order 50 pieces. Lets take 37.5W per board, so each 6 pin PCI power cable will handle 2 boards. This will limit the number of boards per power supply, which only has a limited number of 6 pin PCI power connections. Maybe it's better to find a power distribution board like Avalon is using, so we can split the power from the ATX motherboard connector into many 6 pin PCI cables ? I'll continue searching. |
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BenTuras
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June 18, 2013, 07:33:46 AM |
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I'm planning to make stacks of 12 boards. I've chosen a OCZ ZX850W PSU. It's a single rail with max. 70A at +12V. It has 4 PCI-e connectors, so I can connect to 4 boards. From each of this boards I'll daisy chain to 2 other boards by the terminal block. Power should be sufficient. The PSU should operate in its efficient range, and the current on the single wires is not too high.
Your solution indicates a much higher current than the 75W for a PCI cable. Is that OK ? |
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jesse11
Sr. Member
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Activity: 333
Merit: 250
Ants Rock
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June 18, 2013, 08:24:58 AM |
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Hey burnin, While reading this thread I saw you are asking for advice on PSU's. Not all PSU's are, regardless of the output, the same. http://www.jonnyguru.com has reviewed over 300 PSU,s and is one of most knowledgeable testers I've seen. Here is a review on Corsair's HX850 boasted 80 Plus Silver http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=299 it's a good read. Enjoy, jesse11 |
Mining with: BE's,BE Cubes, K16's, AntMiners U1's and AntMiners S1's
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robix
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June 18, 2013, 08:45:40 AM |
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so you need 3 of those to run up to 36 boards ?
Right. |
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idee2013
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June 18, 2013, 08:51:13 AM |
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for this requirements i would take minimum 80plus gold or platinum PSUs with very good reviews. Therefore one should not make false economies or simply 'save the wrong way'. If you are planning to run the avalons 24/7 you should take a most efficient PSU what you can buy for your money. you will say thanks to your electricity bill and of course it is not funny to have a mining break of some days if your cheap bought PSU has a damage and you need time to get a new one... |
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robix
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June 18, 2013, 08:57:44 AM |
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I'm planning to make stacks of 12 boards. I've chosen a OCZ ZX850W PSU. It's a single rail with max. 70A at +12V. It has 4 PCI-e connectors, so I can connect to 4 boards. From each of this boards I'll daisy chain to 2 other boards by the terminal block. Power should be sufficient. The PSU should operate in its efficient range, and the current on the single wires is not too high.
Your solution indicates a much higher current than the 75W for a PCI cable. Is that OK ? I don't know if there's a limitation to 75W per PCI-e cable. In my case there would be ~120W per wiring. Do you have a source for the 75W limitation? I'll look into the PSU reference guide. |
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Schrankwand
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June 18, 2013, 09:10:58 AM |
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I'm planning to make stacks of 12 boards. I've chosen a OCZ ZX850W PSU. It's a single rail with max. 70A at +12V. It has 4 PCI-e connectors, so I can connect to 4 boards. From each of this boards I'll daisy chain to 2 other boards by the terminal block. Power should be sufficient. The PSU should operate in its efficient range, and the current on the single wires is not too high.
Your solution indicates a much higher current than the 75W for a PCI cable. Is that OK ? I don't know if there's a limitation to 75W per PCI-e cable. In my case there would be ~120W per wiring. Do you have a source for the 75W limitation? I'll look into the PSU reference guide. That is the reference design, yes. You have 75w per PCI-e 6 pin cable. Since The GPUs became just too insanely power hungry with time the 8 pin was added. An 8 pin pci-e plug brings 150w, a 6 pin brings 75w maximum. Therefore, the maximum power a GPU can take is 75+150+150 = 375w at the moment. Additional to that, you will find that burnin has one of these nice green block adapter solutions on the board. That means that from my point of view, you can use EVERY single of these yellow 12v variations to power a SINGLE board:  You just need to use either an adapter or cut it off, crimp it and then connect it to a board. Remember that there is a maximum power draw per module on the PSU though. Theoretically you daisy chain 700w off from ONE module, but this build will surely make you meet a fire extinguisher scenario... In the ideal scenario, you put as little as possible on every line and have one module for every board. The 8 Pin PCI-e should be able to take 2-3 boards though. |
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BenTuras
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June 18, 2013, 09:19:34 AM |
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I don't know if there's a limitation to 75W per PCI-e cable. In my case there would be ~120W per wiring. Do you have a source for the 75W limitation? I'll look into the PSU reference guide.
I have been searching on Google and the general consensus is that a 6pin PCI can easily handle 150W. The difference between the 75W 6 pin and 150W 8 pin is just 2 ground wires. Some people even put the 6pin cable into the 8 pin connector of a GPU without problems. |
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robix
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June 18, 2013, 09:32:34 AM
Last edit: June 18, 2013, 10:40:37 AM by robix |
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The OCZ PSU has 4 8pin connectors. So my configuration should be safe and work.
Feel free to correct me.
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BenTuras
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June 18, 2013, 09:53:58 AM |
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The OCZ PSU has 4 8pin connectors. So my configuration should be save and work.
Feel free to correct me.
You will have 12 boards of 40W = 480W Your power supply can deliver 70A @ 12V = 840W 80% optimum power drain = 480W, so 100%=600W in stead of 840W. So you could go for a smaller PSU maybe ? |
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robix
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June 18, 2013, 10:07:40 AM |
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The OCZ PSU has 4 8pin connectors. So my configuration should be save and work.
Feel free to correct me.
You will have 12 boards of 40W = 480W Your power supply can deliver 70A @ 12V = 840W 80% optimum power drain = 480W, so 100%=600W in stead of 840W. So you could go for a smaller PSU maybe ? That's right. But I think the efficiency of the PSU is better with a lower charging. |
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jesse11
Sr. Member
Offline
Activity: 333
Merit: 250
Ants Rock
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June 18, 2013, 10:08:28 AM |
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for this requirements i would take minimum 80plus gold or platinum PSUs with very good reviews. Therefore one should not make false economies or simply 'save the wrong way'. If you are planning to run the avalons 24/7 you should take a most efficient PSU what you can buy for your money. you will say thanks to your electricity bill and of course it is not funny to have a mining break of some days if your cheap bought PSU has a damage and you need time to get a new one... LOL, I was just using this as an example of the type of reviews done on that site. I personally own a Antec High Current Pro HCP-1200 1200W ATX12V / EPS12V SLI Ready 80 PLUS GOLD Certified Yes, High Current Hybrid Cable Management Active PFC Power Supply. I'm running a 3930K @ 4.2GHz 24/7 3-way SLI GTX 670's for my gaming and benchmarking rig and have 18 World Records at HWBot.  |
Mining with: BE's,BE Cubes, K16's, AntMiners U1's and AntMiners S1's
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idee2013
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June 18, 2013, 10:50:36 AM |
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for this requirements i would take minimum 80plus gold or platinum PSUs with very good reviews. Therefore one should not make false economies or simply 'save the wrong way'. If you are planning to run the avalons 24/7 you should take a most efficient PSU what you can buy for your money. you will say thanks to your electricity bill and of course it is not funny to have a mining break of some days if your cheap bought PSU has a damage and you need time to get a new one... LOL, I was just using this as an example of the type of reviews done on that site. I personally own a Antec High Current Pro HCP-1200 1200W ATX12V / EPS12V SLI Ready 80 PLUS GOLD Certified Yes, High Current Hybrid Cable Management Active PFC Power Supply. I'm running a 3930K @ 4.2GHz 24/7 3-way SLI GTX 670's for my gaming and benchmarking rig and have 18 World Records at HWBot. i don't know what at my statement is to be lough about and i did not criticize anyone. read it again ;-) and i'm sure you have the best equipment in the world...lol |
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burnin (OP)
Sr. Member
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Activity: 243
Merit: 250
ALTCOM Ab9upXvD7ChnJxDRZgMmwNNEf1ftCGWrsE
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June 18, 2013, 10:58:15 AM
Last edit: June 18, 2013, 12:11:40 PM by burnin |
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I don't know if there's a limitation to 75W per PCI-e cable. In my case there would be ~120W per wiring. Do you have a source for the 75W limitation? I'll look into the PSU reference guide.
I have been searching on Google and the general consensus is that a 6pin PCI can easily handle 150W. The difference between the 75W 6 pin and 150W 8 pin is just 2 ground wires. Some people even put the 6pin cable into the 8 pin connector of a GPU without problems. Correct, the specs of the connector state 13Amps per PIN. Just check that the cable gauge connected to those pins is sufficient, but 150W should be possible with any of them.
So yes you can run 3 modules off one 6pin plug. I think i'll go for a ~850W, gold rated, single rail PSU perfect for one tower of 16 modules. |
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bitcoiner49er
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June 18, 2013, 01:48:05 PM |
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One of the best in terms of power, cost and reliability is the Antec HCG-900 which is very often $100 or less. Antec HCG-900 reviewHere is a good description of 80 PLUS and what it certifies. However, for the best setup (IMHO) you would want a great performing, modular PSU I would think. Something similar to this Seasonic 850 would be "perfect". You would be able to plug in extra 6 pin connectors to the appropriate output from the PSU without need for adapters. Simply email the PSU company and inquire about extra connectors, many times you can get them for free - or a very low price. The trick will be finding the best optioned modular PSU to use for your setup. |
Homo doctus is se semper divitias habet
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alexuk
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June 18, 2013, 02:28:23 PM |
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Hi Burnin
Hows things coming along with the sample chips?
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