intron
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Activity: 427
Merit: 251
- electronics design|embedded software|verilog -
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November 21, 2013, 11:46:11 AM |
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Well.. that's another thing... We detected some weird anomaly with the boards. Say you set the pot to something and power up and measure like say 0V8 VDD. Then after the chips get programmed and start hashing the voltage goes up to 1V0!!?!?! This seems to happen especially when clock is set at 52. There's clearly some resonance there, but we don't have the necessary skill and equipment to figure out what exactly is going on and with what settings it occurs. All this mixture of weirdness and black magic makes me hesitate sending them out just yet.. I want to achieve solid performance before I ship. And preferably have the heatsinks made also.
The pot is in the feedback path of the DC/DC converter's control loop. Any noise picked up there can wreak havoc on the output signal. Has this 1V0 voltage level been probed with a scope or only with a voltmeter? And what happens when this pot is replaced with a fixed resistor? intron |
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punin (OP)
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November 21, 2013, 02:42:55 PM |
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Well.. that's another thing... We detected some weird anomaly with the boards. Say you set the pot to something and power up and measure like say 0V8 VDD. Then after the chips get programmed and start hashing the voltage goes up to 1V0!!?!?! This seems to happen especially when clock is set at 52. There's clearly some resonance there, but we don't have the necessary skill and equipment to figure out what exactly is going on and with what settings it occurs. All this mixture of weirdness and black magic makes me hesitate sending them out just yet.. I want to achieve solid performance before I ship. And preferably have the heatsinks made also.
The pot is in the feedback path of the DC/DC converter's control loop. Any noise picked up there can wreak havoc on the output signal. Has this 1V0 voltage level been probed with a scope or only with a voltmeter? And what happens when this pot is replaced with a fixed resistor? intron Hi Intron  Just a voltmeter. We haven't tried replacing the pot. |
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punin (OP)
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November 21, 2013, 02:46:42 PM |
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I released one new rig for testing and feedback into the wild today to one of our first august customers that happens to live nearby, is experienced and did a review on the august version. Let's see how it goes |
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tom99
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November 21, 2013, 02:48:28 PM |
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I released one new rig for testing and feedback into the wild today to one of our first august customers that happens to live nearby, is experienced and did a review on the august version. Let's see how it goes pictures of new rigs please? |
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punin (OP)
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November 21, 2013, 03:02:13 PM |
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I released one new rig for testing and feedback into the wild today to one of our first august customers that happens to live nearby, is experienced and did a review on the august version. Let's see how it goes pictures of new rigs please? I'm sure he'll take pictures. |
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rupy
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November 21, 2013, 05:06:01 PM |
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Ok, so same chip, but why not continue with the old design if the new doesn't improve anything significantly? What is the improvement?
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rammy2k2
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Activity: 1974
Merit: 1003
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November 21, 2013, 05:06:53 PM |
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Ok, so same chip, but why not continue with the old design if the new doesn't improve anything significantly? What is the improvement?
+1 , i was thinking the same |
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Meizirkki
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November 21, 2013, 05:10:32 PM |
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Potentionmeter for easy OC. (Does this break warranty?) Pci-e is impossible to insert the wrong way. No idea why the design was revised, I'm just trying to think of something |
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punin (OP)
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November 21, 2013, 06:06:27 PM |
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Ok, so same chip, but why not continue with the old design if the new doesn't improve anything significantly? What is the improvement?
I'm not the one manufacturing and designing these boards. My personal boards are still in development. Potentionmeter for easy OC. (Does this break warranty?) Pci-e is impossible to insert the wrong way. No idea why the design was revised, I'm just trying to think of something These are valid. PCIe is one-way insertable only. Pot gives more freedom to OV/OC without soldering. Minimizing manufacturing cost is probably one as well. |
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punin (OP)
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November 21, 2013, 06:09:16 PM |
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Actually, I'd like some comments from you...
- Would you like a USB miner or are you happy with standalone RasPi controlled unit?
- Do you feel modular design is important, or would you prefer a nice tidy box?
- What about form factor: free or rack?
- What dB level are you comfortable with?
- Internal custom PSU or ATX?
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Syke
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Activity: 3878
Merit: 1193
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November 21, 2013, 06:11:24 PM |
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Actually, I'd like some comments from you...
- Would you like a USB miner or are you happy with standalone RasPi controlled unit?
- Do you feel modular design is important, or would you prefer a nice tidy box?
- What about form factor: free or rack?
- What dB level are you comfortable with?
- Internal custom PSU or ATX?
Profitability is what matters. 1. USB 2. modular 3. free 4. any 5. ATX |
Buy & Hold
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ricolein
Member
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Activity: 83
Merit: 10
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November 21, 2013, 06:37:04 PM |
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Actually, I'd like some comments from you...
- Would you like a USB miner or are you happy with standalone RasPi controlled unit?
- Do you feel modular design is important, or would you prefer a nice tidy box?
- What about form factor: free or rack?
- What dB level are you comfortable with?
- Internal custom PSU or ATX?
- RasPi - modular - any - any - ATX, because there are more efficent PSU availeble Important for me is efficency (cost & power consumption). Ciao Enrico |
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server
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Activity: 892
Merit: 1002
1 BTC =1 BTC
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November 21, 2013, 06:54:53 PM |
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Actually, I'd like some comments from you...
- Would you like a USB miner or are you happy with standalone RasPi controlled unit?
- Do you feel modular design is important, or would you prefer a nice tidy box?
- What about form factor: free or rack?
- What dB level are you comfortable with?
- Internal custom PSU or ATX?
1. USB 2. modular 3. free 4. any 5. ATX |
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punin (OP)
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November 21, 2013, 06:59:10 PM |
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What if I said I have a PSU that can deliver 3kW at a price of ~400€ and ~90% efficiency? |
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intron
Sr. Member
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Activity: 427
Merit: 251
- electronics design|embedded software|verilog -
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November 21, 2013, 07:03:00 PM |
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I'm not the one manufacturing and designing these boards. My personal boards are still in development.
Hi punin, Making your own board now? PM-ed you, we might have something very (very, very:) interesting for you. If you want to know more PM me or c-scape. Cheers, intron |
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bobsag3
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November 21, 2013, 07:05:44 PM |
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What if I said I have a PSU that can deliver 3kW at a price of ~400€ and ~90% efficiency? Yes. - Doesnt matter to me - I prefer modularity, but not at the expense of time\money - Either - I have a large stack of avalons.. so less than an airplane - Either, shipping is a concern tho |
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rammy2k2
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Activity: 1974
Merit: 1003
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November 21, 2013, 07:07:18 PM |
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- Would you like a USB miner or are you happy with standalone RasPi controlled unit?
- Do you feel modular design is important, or would you prefer a nice tidy box?
- What about form factor: free or rack?
- What dB level are you comfortable with?
- Internal custom PSU or ATX? 1. PI 2. modular 3. free 4. as silent as u can make them 5. ATX |
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eneloop
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Activity: 1513
Merit: 1040
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November 21, 2013, 07:13:12 PM |
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- Would you like a USB miner or are you happy with standalone RasPi controlled unit?
- Do you feel modular design is important, or would you prefer a nice tidy box?
- What about form factor: free or rack?
- What dB level are you comfortable with?
- Internal custom PSU or ATX?
- standalone LAN with stratum support (with or without RPI, doesn't matter) - modular - an optional box would be nice - silent as possible - high power efficiency (if you can offer that an ATX supply isn't necessary) |
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Meizirkki
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November 21, 2013, 07:13:54 PM |
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What if I said I have a PSU that can deliver 3kW at a price of ~400€ and ~90% efficiency? 3kW bitfury device... 3kW/0.8wghps=3.75TH of hashing.  |
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fractal02
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November 21, 2013, 07:15:36 PM
Last edit: November 21, 2013, 07:28:47 PM by fractal02 |
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Actually, I'd like some comments from you...
- Would you like a USB miner or are you happy with standalone RasPi controlled unit?
- Do you feel modular design is important, or would you prefer a nice tidy box?
- What about form factor: free or rack?
- What dB level are you comfortable with?
- Internal custom PSU or ATX?
- USB? why not - Modular is the way to go - Free or rack (bitbonanza style ?) depends on final price (cheaper is better) - Low Db but i have some noctua, so not a big deal  - Well if you can provide a custom psu that lower the final price : i take ! If not => ATX Edit : custom PSU maybe because your next rig is a Monster ? ^^ |
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