Bitcoin Forum
December 04, 2016, 10:39:21 PM *
News: To be able to use the next phase of the beta forum software, please ensure that your email address is correct/functional.
 
   Home   Help Search Donate Login Register  
Pages: « 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 [37] 38 39 40 41 42 43 44 45 46 47 48 49 50 51 »
  Print  
Author Topic: ZTEX USB-FPGA Modules 1.15x and 1.15y: 215 and 860 MH/s FPGA Boards  (Read 174087 times)
ztex
Donator
Sr. Member
*
Offline Offline

Activity: 367

ZTEX FPGA Boards


View Profile WWW
May 23, 2012, 07:57:30 AM
 #721

Quote
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,

1480891161
Hero Member
*
Offline Offline

Posts: 1480891161

View Profile Personal Message (Offline)

Ignore
1480891161
Reply with quote  #2

1480891161
Report to moderator
1480891161
Hero Member
*
Offline Offline

Posts: 1480891161

View Profile Personal Message (Offline)

Ignore
1480891161
Reply with quote  #2

1480891161
Report to moderator
1480891161
Hero Member
*
Offline Offline

Posts: 1480891161

View Profile Personal Message (Offline)

Ignore
1480891161
Reply with quote  #2

1480891161
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
ztex
Donator
Sr. Member
*
Offline Offline

Activity: 367

ZTEX FPGA Boards


View Profile WWW
May 23, 2012, 08:04:59 AM
 #722

ztex can we please, with sugar on top, get a -f XXX commandline flag that hardcodes the frequency so that we can underclock the chips this summer?

Wee already discussed this: https://bitcointalk.org/index.php?topic=40047.msg802603#msg802603

mrb
Legendary
*
Offline Offline

Activity: 1106


View Profile WWW
May 23, 2012, 09:05:53 AM
 #723

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) ?
rupy
Hero Member
*****
Offline Offline

Activity: 724



View Profile
May 23, 2012, 10:19:52 AM
 #724

ztex can we please, with sugar on top, get a -f XXX commandline flag that hardcodes the frequency so that we can underclock the chips this summer?

Wee already discussed this: https://bitcointalk.org/index.php?topic=40047.msg802603#msg802603

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.

BANKBOOK GWT Wallet & no-FIAT Billing API
BTC 14xr5Q1j61A1eA6Mrs5MRhUmYZKboY8iq2 | Vanillacoin FPGA Miner
BR0KK
Hero Member
*****
Offline Offline

Activity: 742



View Profile
May 23, 2012, 10:26:53 AM
 #725

No it would be Bad(er) for business if the boards tend to break .... Smiley

I only invest into things that are durable and covered by warranty.

rupy
Hero Member
*****
Offline Offline

Activity: 724



View Profile
May 23, 2012, 10:53:07 AM
 #726

I think you need to wakeup, every product in your home has been designed to break after a certain time after your warranty expires.

BANKBOOK GWT Wallet & no-FIAT Billing API
BTC 14xr5Q1j61A1eA6Mrs5MRhUmYZKboY8iq2 | Vanillacoin FPGA Miner
BR0KK
Hero Member
*****
Offline Offline

Activity: 742



View Profile
May 23, 2012, 11:09:44 AM
 #727

Do u honestly belive in "build in time to fail counters"?

:d


rupy
Hero Member
*****
Offline Offline

Activity: 724



View Profile
May 23, 2012, 11:17:03 AM
 #728

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.

BANKBOOK GWT Wallet & no-FIAT Billing API
BTC 14xr5Q1j61A1eA6Mrs5MRhUmYZKboY8iq2 | Vanillacoin FPGA Miner
BR0KK
Hero Member
*****
Offline Offline

Activity: 742



View Profile
May 23, 2012, 12:00:05 PM
 #729

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.

rupy
Hero Member
*****
Offline Offline

Activity: 724



View Profile
May 23, 2012, 12:24:20 PM
 #730

I know, but I would like to be able to control this custom designed enterprise solution to suit my setup.

BANKBOOK GWT Wallet & no-FIAT Billing API
BTC 14xr5Q1j61A1eA6Mrs5MRhUmYZKboY8iq2 | Vanillacoin FPGA Miner
vv01f
Sr. Member
****
Offline Offline

Activity: 314


View Profile
May 23, 2012, 12:28:10 PM
 #731

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 . Just be patient.

donations to me please send via bitcoin 1vvo1FDwSAwNdLVA1mFkM7v76XPZAAUfb
a good European exchange: bitcoin.de (ref-link)
sadpandatech
Hero Member
*****
Offline Offline

Activity: 504



View Profile
May 23, 2012, 02:07:13 PM
 #732

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.pdf



On the one you linked, is the output voltage adjustable? And does thaty company by chance make a higher eff rated reg?


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
mrb
Legendary
*
Offline Offline

Activity: 1106


View Profile WWW
May 24, 2012, 10:17:13 AM
 #733

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.pdf

No. The current one is 75% efficient for a 1.2V@8A output, see page 6 of http://www.aosmd.com/res/data_sheets/AOZ1025DI.pdf

Mine is 88% efficient for the same output, see page 9: http://www.irf.com/product-info/datasheets/data/ir3840m.pdf (output voltage is adjustable just like the AOZ1025, by changing resistors).
sadpandatech
Hero Member
*****
Offline Offline

Activity: 504



View Profile
May 24, 2012, 05:44:21 PM
 #734

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.pdf

No. The current one is 75% efficient for a 1.2V@8A output, see page 6 of http://www.aosmd.com/res/data_sheets/AOZ1025DI.pdf

Mine is 88% efficient for the same output, see page 9: http://www.irf.com/product-info/datasheets/data/ir3840m.pdf (output voltage is adjustable just like the AOZ1025, by changing resistors).

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.

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
ztex
Donator
Sr. Member
*
Offline Offline

Activity: 367

ZTEX FPGA Boards


View Profile WWW
May 25, 2012, 07:54:54 AM
 #735

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

Quote
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.

Quote
Perhaps the IR3840MPbF (86% efficient at 12A output at 1.2V) ?

I made some bad experiences with that series.

ztex
Donator
Sr. Member
*
Offline Offline

Activity: 367

ZTEX FPGA Boards


View Profile WWW
May 25, 2012, 07:56:24 AM
 #736

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).

ztex
Donator
Sr. Member
*
Offline Offline

Activity: 367

ZTEX FPGA Boards


View Profile WWW
May 25, 2012, 08:09:56 AM
 #737

But if youre right in your position, I doubt ztex wont listen Wink . Just be patient.

I listen, but I do not reply to such kind of statements Wink

yohan
Sr. Member
****
Offline Offline

Activity: 448



View Profile
May 25, 2012, 12:06:40 PM
 #738

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
luffy
Hero Member
*****
Offline Offline

Activity: 606



View Profile
May 26, 2012, 09:08:45 PM
 #739

BTC payment is not accepted?
stcupp
Full Member
***
Offline Offline

Activity: 196


View Profile
May 26, 2012, 09:25:33 PM
 #740

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

Yep, very true note how a converter might say 95% efficiency but doing 12v to 1.2v conversion at full load theyre more like 75-85% a lot of manufacturers show graphs or a table of efficiency at different voltages and loads in their data sheets

Pages: « 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 [37] 38 39 40 41 42 43 44 45 46 47 48 49 50 51 »
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!