ztex (OP)
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May 23, 2012, 07:46:41 AM |
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I also experience these "hashrate drop errors", but only with BTCMiner. With cgminer 2.4.1 I've never got such an error. The hashrate drop code is present in cgminer. So what does it mean? The hashrate drop errors are present, but cgminer fails to detect them. Or, something is wrong within BTCMiner. One observation I've made... I get the hashrate drop errors in BTCMiner always around "new block" announcments.
These "hashrate drop errors" occur if the frequency is reduced too much because the error rate increases. If cgminer uses an other error rate detecting algorithm (e.g. slower sampling rate) it may oversee this errors. I some cases (e.g. if ambient temperature increases by more then 10°C) the default setting may be a little bit to sensitive, try out "-oh 0.06" or "-oh 0.08", but not higher because that would break the overheat detection mechanism. If the frequency drops by more than 8% there are problems on the hardware side (cooling, power supply stability)
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ztex (OP)
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ZTEX FPGA Boards
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May 23, 2012, 07:57:30 AM |
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I assume you're only seeing the errors on the quads (I had only seen them on the quads). Are you driving them (1 or 2) on 1 psu? How are you wiring your +12V and GND wires? I had these errors initially where over half of my quads eventually were disabled over the course of a week. I rewired the power cables and haven't seen them for 2 weeks now. One quad with its own PSU. Five singles on the splitter thingie and one Single on its separate wall plug. No its not only the quad. Today for example i came home, three of the five on the splitter and the one on the separate wall plug singles had an LED on (indication that they weren't programmed or stopped working). This kinda happened when emc pool did go offline today (i assume!) These PSU's become unstable (interruptions) if they get to hot. Try to connect four singles to one 60W PSU,
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mrb
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May 23, 2012, 09:05:53 AM |
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ztex, can you please upgrade the AOZ1025 buck regulator on your designs to another able to output more than 8A to each FPGA, and more efficient? Multiple groups (eldentyrell, bitfury, etc) are writing bitstreams pushing the LX150 beyond 8A... And the AOZ1025 is not super efficient.
Perhaps the IR3840MPbF (86% efficient at 12A output at 1.2V) ?
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rupy
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May 23, 2012, 10:19:52 AM |
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Ok, could you add a zero error rate command... that lowers the frequency until error rate is = 0.00% forever? I understand it's bad for business if the cards never break, because then we wont buy new ones, but we would like to be ABLE to control the heat. It should be easy no? Basically can you try to add anything for the passive community to control longevity.
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BR0KK
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May 23, 2012, 10:26:53 AM |
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No it would be Bad(er) for business if the boards tend to break .... I only invest into things that are durable and covered by warranty.
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rupy
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May 23, 2012, 10:53:07 AM Last edit: May 23, 2012, 11:10:29 AM by rupy |
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I think you need to wakeup, every product in your home has been designed to break after a certain time after your warranty expires.
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BR0KK
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May 23, 2012, 11:09:44 AM |
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Do u honestly belive in "build in time to fail counters"?
:d
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rupy
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May 23, 2012, 11:17:03 AM Last edit: May 23, 2012, 12:23:05 PM by rupy |
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It's a fact, lightbulbs used to last 2500 hours, then the manufacturers agreed they would guarantee 1000 hours... Ink jet printers for example have electronic chooking once the pad soaking up the ink gets wet, you can install software that ignores it. I have stopped buying "consumer" products. Professional gear doesn't have fail counters and are built to last.
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BANKBOOK GWT Wallet & no-FIAT Billing API
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BR0KK
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May 23, 2012, 12:00:05 PM |
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Were not talking about printers or lightbulps here; these ztex boards are custom designed and not cheap... I wouldnt count them as a consumer product, more likely a enterprise solution.
Hardware degeneration is normal and to be expected. Like some Parts of your car need to be changed from time to time.
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rupy
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May 23, 2012, 12:24:20 PM |
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I know, but I would like to be able to control this custom designed enterprise solution to suit my setup.
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vv01f
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May 23, 2012, 12:28:10 PM |
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I know, but I would like to be able to control this custom designed enterprise solution to suit my setup.
You might ask to license the layout and built it on your own or with partners. I personally think ztex is quite qualified to judge his work and how he does it. Or did you hear/read of one badly built boards by him? I didnt. But I read about things normally boards doant outlive that well. But if youre right in your position, I doubt ztex wont listen ![Wink](https://bitcointalk.org/Smileys/default/wink.gif) . Just be patient.
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sadpandatech
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May 23, 2012, 02:07:13 PM |
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ztex, can you please upgrade the AOZ1025 buck regulator on your designs to another able to output more than 8A to each FPGA, and more efficient? Multiple groups (eldentyrell, bitfury, etc) are writing bitstreams pushing the LX150 beyond 8A... And the AOZ1025 is not super efficient.
Perhaps the IR3840MPbF (86% efficient at 12A output at 1.2V) ?
I can't disagree on wanting available a higher possible amp and not to sound like an Aosmd fan boy, but it's a shame they don't appear offer any regs at higher amperage. :/ the current one is rated 95% http://www.aosmd.com/res/data_sheets/AOZ1025DI.pdfOn the one you linked, is the output voltage adjustable? And does thaty company by chance make a higher eff rated reg?
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If you're not excited by the idea of being an early adopter 'now', then you should come back in three or four years and either tell us "Told you it'd never work!" or join what should, by then, be a much more stable and easier-to-use system. - GA
It is being worked on by smart people. -DamienBlack
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sadpandatech
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May 24, 2012, 05:44:21 PM Last edit: May 27, 2012, 01:33:03 AM by sadpandatech |
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Thanks for taking te time to flip through those specs to point that out. Probably a good call to migrate off Aosmd anyhows then. ;p They rating 95% with reg at the lowest input then? jerks.
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If you're not excited by the idea of being an early adopter 'now', then you should come back in three or four years and either tell us "Told you it'd never work!" or join what should, by then, be a much more stable and easier-to-use system. - GA
It is being worked on by smart people. -DamienBlack
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ztex (OP)
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ZTEX FPGA Boards
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May 25, 2012, 07:54:54 AM |
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ztex, can you please upgrade the AOZ1025 buck regulator on your designs to another able to output more than 8A to each FPGA, and more efficient? Multiple groups (eldentyrell, bitfury, etc) are writing bitstreams pushing the LX150 beyond 8A...
The current design can deliver up to 240 MH/s (tested). New designs will not appear within the next three months And the AOZ1025 is not super efficient.
How do you determine that? The efficiency mainly depends from the external components, namely the lower mosfet and the inductor. Perhaps the IR3840MPbF (86% efficient at 12A output at 1.2V) ?
I made some bad experiences with that series.
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ztex (OP)
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Activity: 367
Merit: 250
ZTEX FPGA Boards
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May 25, 2012, 07:56:24 AM |
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Ok, could you add a zero error rate command... that lowers the frequency until error rate is = 0.00% forever?
Yes, a error rate limit this can be added easily. I put it on the todo list for the next release (in June).
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ztex (OP)
Donator
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Activity: 367
Merit: 250
ZTEX FPGA Boards
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![](https://bitcointalk.org/Themes/custom1/images/post/xx.gif) |
May 25, 2012, 08:09:56 AM |
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But if youre right in your position, I doubt ztex wont listen ![Wink](https://bitcointalk.org/Smileys/default/wink.gif) . Just be patient. I listen, but I do not reply to such kind of statements ![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
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yohan
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May 25, 2012, 12:06:40 PM |
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Manufacturers of regulator chips usually headline the highest efficiency achieveable which is usually at the smallest input/output difference. It's not unusual for a 12V to 1.2V regulator circuit to be around 75-80% even if the headline says 90%+. Best efficiency is rarely at maximum current either.
Yohan
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luffy
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May 26, 2012, 09:08:45 PM |
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BTC payment is not accepted?
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