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Blisk
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April 29, 2014, 07:41:12 PM |
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got myself 39kohm resistors (type 603) and 220uf 35v capacitors.
Will post with my results once ive done the soldering ;-P hoping for 1050mhz stable
post some pictures |
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xcooling
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Activity: 145
Merit: 10
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April 29, 2014, 11:56:43 PM |
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will do...
does anyone know the root password for hashra ?
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xcooling
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Activity: 145
Merit: 10
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April 30, 2014, 07:11:25 AM |
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anyone tested a 43Kohm resistor ?
Could only source a 39 and a 43.
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Blisk
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April 30, 2014, 07:23:32 AM |
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anyone tested a 43Kohm resistor ?
Could only source a 39 and a 43.
you can do whatever you want from 39 to 43, but as I read 43 is top. |
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J4bberwock (OP)
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April 30, 2014, 10:23:32 AM |
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anyone tested a 43Kohm resistor ?
Could only source a 39 and a 43.
I'm using 43 +/- 5% One of them is 42, the second one is 42.7. Both PCB works correctly but very hot so active cooling . Doubled power plugs, upgraded capacitors on one PCB and 0.75mm² wires to power the blades. |
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Blisk
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April 30, 2014, 10:26:29 AM |
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post some pictures.
i will take off power plug and weld on it wires
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xcooling
Member
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Activity: 145
Merit: 10
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April 30, 2014, 12:03:12 PM |
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@J4bberwock, did u upgrade 1 or 3 capacitors on each board ?
Doubling the powerplugs ? directly soldering the powerwires would be easier and better.
Whats the stable core mhz and combined hash rate with 43Kohm ?
+1 for pics.
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J4bberwock (OP)
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April 30, 2014, 08:44:39 PM |
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@xcooling, I replaced the 16v cap with 2 parallel 220uF 25V I had. It will be replaced by 2 parallel 470uF 35V since I'm back at home. best results so far https://bitcointalk.org/index.php?topic=576784.msg6386770#msg63867701100Mhz with some HW errors 7.5Mh/s or 1083MHz with almost no HW errors 7.2Mh/s More tests soon since I'm back at home, but I'm still awaiting some heatsinks ordered 2 weeks ago. We should be able to get 7.5Mh/s with almost no HW errors by cooling the chips. Errors are appearing after some time and they are happening faster when the board gets hotter. Next step will probably be an homemade improved power board that will be tried on one 5 chips pod before I try it on the blade. more pics will be posted when I'll upgrade the PCB with cooling. |
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Blisk
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April 30, 2014, 09:03:46 PM |
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Xer0
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April 30, 2014, 09:22:55 PM |
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that cheap dc-dc boards are not really suitable for powering chips
you will need a very very stable, clean supply with almost no ripple
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Blisk
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April 30, 2014, 09:28:43 PM |
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that cheap dc-dc boards are not really suitable for powering chips
you will need a very very stable, clean supply with almost no ripple
yes I know it was just a quick look, it is not even enough powerfull after I check it how much ampers that 40 chips consume is anybody measured? I have checked some 5v power supply and to lower voltage to 1,4 or 1,5 V. But with high amperage it will make it extremly hot. |
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Xer0
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April 30, 2014, 11:12:45 PM |
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how much ampers that 40 chips consume is anybody measured? did not measured it but... 5chip grid with vMod1 drawing 10W without fan, Voltage 1.25-1.35V assuming 90% efficiency at PSU and from 12V to VRM i would guess: 1.1-1.3A per chip |
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ZiG
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May 01, 2014, 02:53:34 AM |
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how much ampers that 40 chips consume is anybody measured? did not measured it but... 5chip grid with vMod1 drawing 10W without fan, Voltage 1.25-1.35V assuming 90% efficiency at PSU and from 12V to VRM i would guess: 1.1-1.3A per chip Second this... 5 chips design is consuming 20W+ when volt mod...DVDD to 1.75V-1.80V ,,,so each chip is like 4W /1.75V = 2.30A ...or around 2.5A Max per chip provably will be enough...I guess...40 chips per blade = 100A @ overvolted mode This is why I suggested you the choice of 100A MOSFETs a few posts above... ZiG |
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wolfey2014
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May 01, 2014, 03:37:51 AM |
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how much ampers that 40 chips consume is anybody measured? did not measured it but... 5chip grid with vMod1 drawing 10W without fan, Voltage 1.25-1.35V assuming 90% efficiency at PSU and from 12V to VRM i would guess: 1.1-1.3A per chip Second this... 5 chips design is consuming 20W+ when volt mod...DVDD to 1.75V-1.80V ,,,so each chip is like 4W /1.75V = 2.30A ...or around 2.5A Max per chip provably will be enough...I guess...40 chips per blade = 100A @ overvolted mode This is why I suggested you the choice of 100A MOSFETs a few posts above... ZiG Actually, I would call for a bit more overhead than that.  Just so they don't have to work as hard hence, don't get as warm either. Maximum efficiency! |
I Modify Miners Professionally! PM me for details!
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Blisk
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May 01, 2014, 07:35:36 AM |
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so you need about 300W per blade, but I think only way is to made a custom power supply or to get one with 5V and lower to what it takes for OC.
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J4bberwock (OP)
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May 01, 2014, 08:39:57 AM |
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so you need about 300W per blade, but I think only way is to made a custom power supply or to get one with 5V and lower to what it takes for OC.
A simple copy/paste of the actual board with same or upgraded components connected in parallel should work. That's what I'll try. |
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Blisk
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May 01, 2014, 09:13:30 AM |
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so you need about 300W per blade, but I think only way is to made a custom power supply or to get one with 5V and lower to what it takes for OC.
A simple copy/paste of the actual board with same or upgraded components connected in parallel should work. That's what I'll try. I think that is too complicated. I think some extra board for power and you cut existing power chip and replace it with more power. |
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ZiG
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May 01, 2014, 05:45:39 PM
Last edit: May 01, 2014, 06:04:35 PM by ZiG |
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so you need about 300W per blade, but I think only way is to made a custom power supply or to get one with 5V and lower to what it takes for OC.
A simple copy/paste of the actual board with same or upgraded components connected in parallel should work. That's what I'll try. Hey J4bberwock, Why you don't try to use 1 Gridseed 5-chip board as additional power source...? Their power section is designed to deliver up to 60W in BTC...which is about 30+ Amps @ 1.75V overvolted... maybe enough to supplement the power section of the 1 blade...plus you could control the Voltage DVDD+ very precisely using a trim pot...so the Blade and the 5 chip would be at the same voltage for parallel operation... IMHO it will be easier to implement than a custom external source...just an idea to think about...I believe it's doable... ZiG EDIT...: It is already "Cut&Paste" ...almost the same power section...+ it is already manufactured, ready to use...no redesign, PCB, production...etc needed...C42 is a good output point... |
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Blisk
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May 01, 2014, 06:17:31 PM |
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If you like to use two power supply for powering 40 chips, that is not easy to do with tha low voltage you can quickly jump over 0,5 V or more.
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J4bberwock (OP)
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May 02, 2014, 09:26:16 AM |
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so you need about 300W per blade, but I think only way is to made a custom power supply or to get one with 5V and lower to what it takes for OC.
A simple copy/paste of the actual board with same or upgraded components connected in parallel should work. That's what I'll try. Hey J4bberwock, Why you don't try to use 1 Gridseed 5-chip board as additional power source...? Their power section is designed to deliver up to 60W in BTC...which is about 30+ Amps @ 1.75V overvolted... maybe enough to supplement the power section of the 1 blade...plus you could control the Voltage DVDD+ very precisely using a trim pot...so the Blade and the 5 chip would be at the same voltage for parallel operation... IMHO it will be easier to implement than a custom external source...just an idea to think about...I believe it's doable... ZiG EDIT...: It is already "Cut&Paste" ...almost the same power section...+ it is already manufactured, ready to use...no redesign, PCB, production...etc needed...C42 is a good output point... Hi, you are close to what I want to do. I want to double the part of the board that feeds the up1509. this way, the chips will still have the same regulated power supply. The idea is to try to bridge 2 pods before going on the blade. I already identified easy connection points on the board, yellow/orange circles red circles are our hot spots to cool down. Funny thing is the initial design used 4 vrm (Q5 to Q8) for 8 chips and they decided to cut it down to 3 as on the 5chips pod, but for 40 chips. Should be related to the LTC only mode on the blades. +5V will be collected after bat54C on R10, 12V at C12 and the return will be at R14, R117, R15, EC3, R31, R36 plus ground. only 9 connection points, should be ok.  |
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