The OCZ PSU has 4 8pin connectors. So my configuration should be safe and work.
Feel free to correct me.
Topic: [Work in progess] Burnins Avalon Chip to mining board service - page 146. (Read 624197 times)
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.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 ?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.
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 ?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
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
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...
so you need 3 of those to run up to 36 boards ?
Right. 
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
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
http://www.enterpoint.co.uk/cairnsmore/cairnsmore1.html
The Power Distribution Board could be used to split the ATX motherboard power connector into 6 PCI express connections.
The Power Distribution Board could be used to split the ATX motherboard power connector into 6 PCI express connections.
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 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.html
minimum 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.
minimum 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.
so you need 3 of those to run up to 36 boards ?
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.
I can recommend the reviews in here Hardware Secrets. Very detailed for your personal configuration needs.
Yes, but they are proving to be rather bitchy, at least without a proper PCB.
Constructing the test harness for it took hours of very careful soldering under a microscope.
Maybe my clock source has to much jitter, or the PLL core voltage is too noisy for it to lock.
I will continue testing though.
Hmm, fingers crossed. Good luck!
Could any of the old GPU miners recommend me a good brand power supply that I could offer along with these boards?
Well, there's Corsair, Enermax, Antec, OCZ (and many more). But depending on the amount of boards you want to run, efficiency would be a key factor (next to stable voltage obviously). So you might end up with a relatively low powered psu for most buyers (in the range of a 20 - 200 chips). Efficiency is often tied to the load % on the psu, so selecting a proper one might not be trivial (although a Corsair HX650/HX750 will surely do the job. Maybe Antec Earthwatts Platinum EA-550)
hi burnin,
i could not find the answer in this topic.
Are your prices (80EUR/100EUR} with or without Mwst/VAT for EU customers?
i could not find the answer in this topic.
Are your prices (80EUR/100EUR} with or without Mwst/VAT for EU customers?
Includes VAT, but I still wait for the quote for the final PCB revision for the final Price.
Hello. A board with 20 chips hash with 5,6 gh. Is with the board overclocking possible? And how much percent are possible?
Greez
Greez
20%, from what I have heard.
up to 340mhz / mhash
no, thats wrong. max 300mhz stable / 6.5%
https://bitcointalksearch.org/topic/is-it-safe-to-set-core-frequency-to-300mhz-extreme-for-avalon-166769
Theoretically one could set it even higher, needs experiments though.
any updates burnin? making sweet love to those avalon chips yet?
Yes, but they are proving to be rather bitchy, at least without a proper PCB.
Constructing the test harness for it took hours of very careful soldering under a microscope.
Maybe my clock source has to much jitter, or the PLL core voltage is too noisy for it to lock.
I will continue testing though.
Anyways I also pushed in other directions: case designs
Even though "case" is a bit of a exaggeration.
I plan to provide two options at opening of the website:
1. Basic foot for the tower of modules, to provide extra stability.
2. a Foot with a place to mount the ATX power supply and the Raspi.
A 19" Case is in planning phase.
Could any of the old GPU miners recommend me a good brand power supply that I could offer along with these boards?
Hello. A board with 20 chips hash with 5,6 gh. Is with the board overclocking possible? And how much percent are possible?
Greez
Greez
20%, from what I have heard.
up to 340mhz / mhash
no, thats wrong. max 300mhz stable / 6.5%
https://bitcointalksearch.org/topic/is-it-safe-to-set-core-frequency-to-300mhz-extreme-for-avalon-166769
Hello. A board with 20 chips hash with 5,6 gh. Is with the board overclocking possible? And how much percent are possible?
Greez
Greez
20%, from what I have heard.
up to 340mhz / mhash
Hello. A board with 20 chips hash with 5,6 gh. Is with the board overclocking possible? And how much percent are possible?
Greez
Greez
20%, from what I have heard.
My God, I don't understand a word from this thread.
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