[ANN] US/North American Bitfury sales NEW STOCK ***NOW SHIPPING***

[mb300sd]

We are a couple days yet from getting our 16 chip boards with the trimmer on the board.  I have some 8 chip boards that are an experimental OC board that use the same trim pot and I want to set the stage for how this will work.

In order to use this trimmer, you *must* have a multimeter and know how to measure resistance.  If you don't know what I'm talking about, you aren't ready to try to OC your boards.

An easy place to take resistance measurements is to get ground off the M-board GND terminal (where you would connect direct 12V cables - the terminal screws).  The red probe would go on the top metal contact of the Pulse inductor, which is the large bulky component on the H-card.  Be sure not to also touch the caps that are nearby or you won't get a correct voltage.

While measuring the voltage, use your super-micro tweaker phillips screwdriver to *slowly* turn the trimmer clockwise for higher voltage or counter-clockwise for lower.  The trimmer has an effective range of about 180-degrees.  If you turn it down too far, you will see voltage begin to rise again. 

Don't make voltage changes quickly.  If you go higher than about .895v you better know what you are doing or you will kill your chips.  I don't even know what voltages people are getting away with on these boards.  Find a guide or post before you start mucking around.  Overclocking *will* reduce the reliability of the boards.

nice to see you guys selling 8 chips boards. FYI, for the one I made (https://bitcointalk.org/index.php?topic=228677.msg3259455#msg3259455), I'm running around 0.9v and pulling 21-22GH and ~23W. been too lazy to try higher voltage.

do i see oshpark boards? I've been placing quite a few orders there lately

yup, they are pretty convenient and relatively cheap

Would you be willing to sell that board on their market? I might be interested in a couple.

[1714622331]

1714622331

[1714622331]

1714622331

[1714622331]

1714622331

[kaerf]

We are a couple days yet from getting our 16 chip boards with the trimmer on the board.  I have some 8 chip boards that are an experimental OC board that use the same trim pot and I want to set the stage for how this will work.

In order to use this trimmer, you *must* have a multimeter and know how to measure resistance.  If you don't know what I'm talking about, you aren't ready to try to OC your boards.

An easy place to take resistance measurements is to get ground off the M-board GND terminal (where you would connect direct 12V cables - the terminal screws).  The red probe would go on the top metal contact of the Pulse inductor, which is the large bulky component on the H-card.  Be sure not to also touch the caps that are nearby or you won't get a correct voltage.

While measuring the voltage, use your super-micro tweaker phillips screwdriver to *slowly* turn the trimmer clockwise for higher voltage or counter-clockwise for lower.  The trimmer has an effective range of about 180-degrees.  If you turn it down too far, you will see voltage begin to rise again. 

Don't make voltage changes quickly.  If you go higher than about .895v you better know what you are doing or you will kill your chips.  I don't even know what voltages people are getting away with on these boards.  Find a guide or post before you start mucking around.  Overclocking *will* reduce the reliability of the boards.

nice to see you guys selling 8 chips boards. FYI, for the one I made (https://bitcointalk.org/index.php?topic=228677.msg3259455#msg3259455), I'm running around 0.9v and pulling 21-22GH and ~23W. been too lazy to try higher voltage.

do i see oshpark boards? I've been placing quite a few orders there lately

yup, they are pretty convenient and relatively cheap

Would you be willing to sell that board on their market? I might be interested in a couple.

Here are the design files...

board and schematics
https://mega.co.nz/#!89gQkSwD!MDH1iXvlsSogk3XUIjjuVDP_EW9drPgCeogcdzwCI7U
gerbers
https://mega.co.nz/#!Yoh1yJoa!NhdcoRqV7qH9TwMq5V15SyC5O4wbv8cByE6ItZLHGc0
stencil
https://mega.co.nz/#!I44VjQAb!YYo9-EVSZiuvPcBu8-wBUAmlGm0DTr0T8nDBGYf9lNY

Even though these work for me I'd still recommend you review them before use...I'm not an EE, but it was fairly straightforward to redraw the 8chip board. It was a quick job, so there are extra holes and the component names are not sequential. The nice thing that i added was holes for a standard chip set heatsink (59 mm diag spacing)

[blackarrow]

I've been authorized to offer bulk chips by the reel (3000 pcs) for $5/chip.  If you rate the chip at even 2GH/s this is only $2.50/GHs!

As promised to our customers, we will beat this offer and adjust our prices accordingly.

[Bicknellski]

I've been authorized to offer bulk chips by the reel (3000 pcs) for $5/chip.  If you rate the chip at even 2GH/s this is only $2.50/GHs!

As promised to our customers, we will beat this offer and adjust our prices accordingly.

Nice... polite price war... sweet.

[goxed]

EDIT: I have heatsinks on back of all boards in regulator area, and 120 CFM fans!

Does the backside of the regulator even get hot? I have felt the top of the chip and its very hot but I don't feel much on the backside. Wouldn't putting a small heatsink on the chip do more?

For the hashing chips those thermal vias work well as even touching the vias themselves gets hot, even better with a heatsink.

Yes, it gets quite hot. I believe they are also constructed do dissipate the heat to the board, but I did not do any research in that matter.
In my opinion the regulator heatsink is much more important than chip heatsinks.

+1, the most important task before serious overvolting of the h-boards (0.8V+) is to first stick heatsinks on the back side of the board under the regulator. If possible, stick a heatsink on top of the regulator and the inductor. This way you can take them as high as 1V. The board will dissipate close to 70Watts at 1V.

[jimrome]

EDIT: I have heatsinks on back of all boards in regulator area, and 120 CFM fans!

Does the backside of the regulator even get hot? I have felt the top of the chip and its very hot but I don't feel much on the backside. Wouldn't putting a small heatsink on the chip do more?

For the hashing chips those thermal vias work well as even touching the vias themselves gets hot, even better with a heatsink.

Yes, it gets quite hot. I believe they are also constructed do dissipate the heat to the board, but I did not do any research in that matter.
In my opinion the regulator heatsink is much more important than chip heatsinks.

+1, the most important task before serious overvolting of the h-boards (0.8V+) is to first stick heatsinks on the back side of the board under the regulator. If possible, stick a heatsink on top of the regulator and the inductor. This way you can take them as high as 1V. The board will dissipate close to 70Watts at 1V.

If you're seriously at the point where you're heatsinking the coil, I'd suggest just getting a part with a higher saturation current as there are pin/footpring-compatible replacements in the same series. This version has  sat. current of 55A: http://www.digikey.ca/product-detail/en/PA0513.441NLT/553-2076-1-ND/3687452. FYI the stock part is a PA0513.441NLT which has a sat. current of 35A.

I don't know what other impacts this would have on the performance of the regulator, so don't try this unless you're willing to experiment.

[Keefe]

EDIT: I have heatsinks on back of all boards in regulator area, and 120 CFM fans!

Does the backside of the regulator even get hot? I have felt the top of the chip and its very hot but I don't feel much on the backside. Wouldn't putting a small heatsink on the chip do more?

For the hashing chips those thermal vias work well as even touching the vias themselves gets hot, even better with a heatsink.

Yes, it gets quite hot. I believe they are also constructed do dissipate the heat to the board, but I did not do any research in that matter.
In my opinion the regulator heatsink is much more important than chip heatsinks.

+1, the most important task before serious overvolting of the h-boards (0.8V+) is to first stick heatsinks on the back side of the board under the regulator. If possible, stick a heatsink on top of the regulator and the inductor. This way you can take them as high as 1V. The board will dissipate close to 70Watts at 1V.

Can you recommend a source for suitable heatsinks?

[tom99]

EDIT: I have heatsinks on back of all boards in regulator area, and 120 CFM fans!

Does the backside of the regulator even get hot? I have felt the top of the chip and its very hot but I don't feel much on the backside. Wouldn't putting a small heatsink on the chip do more?

For the hashing chips those thermal vias work well as even touching the vias themselves gets hot, even better with a heatsink.

Yes, it gets quite hot. I believe they are also constructed do dissipate the heat to the board, but I did not do any research in that matter.
In my opinion the regulator heatsink is much more important than chip heatsinks.

+1, the most important task before serious overvolting of the h-boards (0.8V+) is to first stick heatsinks on the back side of the board under the regulator. If possible, stick a heatsink on top of the regulator and the inductor. This way you can take them as high as 1V. The board will dissipate close to 70Watts at 1V.

Can you recommend a source for suitable heatsinks?

   maybe you like this heatsink but some said it's too tall http://www.ebay.com/itm/100x140x12-7mm-Aluminum-Heatsink-for-Electronic-Computer-Electric-equipment-H157-/181110341808?ssPageName=ADME:L:OC:CA:3160

[Keefe]

It's putting a heatsink on the back of the voltage regulator that looks like a challenge because of the components around it. Has anyone succeeded with that?

[klondike_bar]

EDIT: I have heatsinks on back of all boards in regulator area, and 120 CFM fans!

Does the backside of the regulator even get hot? I have felt the top of the chip and its very hot but I don't feel much on the backside. Wouldn't putting a small heatsink on the chip do more?

For the hashing chips those thermal vias work well as even touching the vias themselves gets hot, even better with a heatsink.

Yes, it gets quite hot. I believe they are also constructed do dissipate the heat to the board, but I did not do any research in that matter.
In my opinion the regulator heatsink is much more important than chip heatsinks.

+1, the most important task before serious overvolting of the h-boards (0.8V+) is to first stick heatsinks on the back side of the board under the regulator. If possible, stick a heatsink on top of the regulator and the inductor. This way you can take them as high as 1V. The board will dissipate close to 70Watts at 1V.

Can you recommend a source for suitable heatsinks?

   maybe you like this heatsink but some said it's too tall http://www.ebay.com/itm/100x140x12-7mm-Aluminum-Heatsink-for-Electronic-Computer-Electric-equipment-H157-/181110341808?ssPageName=ADME:L:OC:CA:3160

i would beleive that you cant fill every slot on the board if using a heatsink taller than 8-10mm. i have some 35x35x6mm heatsinks on mine that easily allow airflow between every slot

[tom99]

EDIT: I have heatsinks on back of all boards in regulator area, and 120 CFM fans!

Does the backside of the regulator even get hot? I have felt the top of the chip and its very hot but I don't feel much on the backside. Wouldn't putting a small heatsink on the chip do more?

For the hashing chips those thermal vias work well as even touching the vias themselves gets hot, even better with a heatsink.

Yes, it gets quite hot. I believe they are also constructed do dissipate the heat to the board, but I did not do any research in that matter.
In my opinion the regulator heatsink is much more important than chip heatsinks.

+1, the most important task before serious overvolting of the h-boards (0.8V+) is to first stick heatsinks on the back side of the board under the regulator. If possible, stick a heatsink on top of the regulator and the inductor. This way you can take them as high as 1V. The board will dissipate close to 70Watts at 1V.

Can you recommend a source for suitable heatsinks?

   maybe you like this heatsink but some said it's too tall http://www.ebay.com/itm/100x140x12-7mm-Aluminum-Heatsink-for-Electronic-Computer-Electric-equipment-H157-/181110341808?ssPageName=ADME:L:OC:CA:3160

i would beleive that you cant fill every slot on the board if using a heatsink taller than 8-10mm. i have some 35x35x6mm heatsinks on mine that easily allow airflow between every slot

   no, that work fined for me and I think someone here said 15mm or less still work.

[goxed]

EDIT: I have heatsinks on back of all boards in regulator area, and 120 CFM fans!

Does the backside of the regulator even get hot? I have felt the top of the chip and its very hot but I don't feel much on the backside. Wouldn't putting a small heatsink on the chip do more?

For the hashing chips those thermal vias work well as even touching the vias themselves gets hot, even better with a heatsink.

Yes, it gets quite hot. I believe they are also constructed do dissipate the heat to the board, but I did not do any research in that matter.
In my opinion the regulator heatsink is much more important than chip heatsinks.

+1, the most important task before serious overvolting of the h-boards (0.8V+) is to first stick heatsinks on the back side of the board under the regulator. If possible, stick a heatsink on top of the regulator and the inductor. This way you can take them as high as 1V. The board will dissipate close to 70Watts at 1V.

Can you recommend a source for suitable heatsinks?

http://www.ebay.com/itm/8PCS-Pure-Copper-Memory-Chipset-Cooler-Heat-Sinks-HeatSink-For-IC-DDR-RAM-VGA-/350705273019?pt=US_Memory_Chipset_Cooling&hash=item51a7a9c8bb

a) it's copper
b) it's low profile
c) tried and tested on my cards

[goxed]

It's putting a heatsink on the back of the voltage regulator that looks like a challenge because of the components around it. Has anyone succeeded with that?

you have to put it slightly towards the right.
I will be modding some of my cards today, will post some pics

[goxed]

EDIT: I have heatsinks on back of all boards in regulator area, and 120 CFM fans!

Does the backside of the regulator even get hot? I have felt the top of the chip and its very hot but I don't feel much on the backside. Wouldn't putting a small heatsink on the chip do more?

For the hashing chips those thermal vias work well as even touching the vias themselves gets hot, even better with a heatsink.

Yes, it gets quite hot. I believe they are also constructed do dissipate the heat to the board, but I did not do any research in that matter.
In my opinion the regulator heatsink is much more important than chip heatsinks.

+1, the most important task before serious overvolting of the h-boards (0.8V+) is to first stick heatsinks on the back side of the board under the regulator. If possible, stick a heatsink on top of the regulator and the inductor. This way you can take them as high as 1V. The board will dissipate close to 70Watts at 1V.

If you're seriously at the point where you're heatsinking the coil, I'd suggest just getting a part with a higher saturation current as there are pin/footpring-compatible replacements in the same series. This version has  sat. current of 55A: http://www.digikey.ca/product-detail/en/PA0513.441NLT/553-2076-1-ND/3687452. FYI the stock part is a PA0513.441NLT which has a sat. current of 35A.

I don't know what other impacts this would have on the performance of the regulator, so don't try this unless you're willing to experiment.

Thanks for the link. I have to get back to the data sheet of the regulator and check the specs of  the inductor.

[Keefe]

Just to share some numbers...

So far, without heatsinks, my BitFury rigs are up to a total of 743 GH/s, for 21 H-boards (minus 3 bad chips on one), so an average of 2.23 GH/s per chip or 35.7 GH/s per full board. Ambient is 26C, and I have 3 Delta AFB1212VHE (148 CFM each) fans blowing through both rigs. With my cheapie IR thermometer, I didn't find any spot on the boards hotter than 70C, but I wan't able to focus closer than probably 1" diameter. Average voltage as measured between the top of the Pulse inductor and the M-boards' ground terminal is 0.864v. I'm running the original v1 chainminer on one board and the latest chainminer on the other, both on auto. Total power usage at the wall is 782W including probably 30W for the fans. The PSU should be about 86% efficient.

[goxed]

[Keefe]

Thanks for the pics. Aren't those heatsinks for the VR really close to shorting something though?

[goxed]

Thanks for the pics. Aren't those heatsinks for the VR really close to shorting something though?

pleasure. very tight margins. i have used a small dab of superglue to prevent excursions.

[Xian01]

 Dave,

 I am interested in purchasing a couple cases from Spotswood to house my October rigs.

 Can you offer any insight as to whether anything has significantly changed with v3 rigs, that would preclude proper mounting when compared with v1 and v2 rigs ?

 Cheers !

[tom99]

EDIT: I have heatsinks on back of all boards in regulator area, and 120 CFM fans!

Does the backside of the regulator even get hot? I have felt the top of the chip and its very hot but I don't feel much on the backside. Wouldn't putting a small heatsink on the chip do more?

For the hashing chips those thermal vias work well as even touching the vias themselves gets hot, even better with a heatsink.

Yes, it gets quite hot. I believe they are also constructed do dissipate the heat to the board, but I did not do any research in that matter.
In my opinion the regulator heatsink is much more important than chip heatsinks.

+1, the most important task before serious overvolting of the h-boards (0.8V+) is to first stick heatsinks on the back side of the board under the regulator. If possible, stick a heatsink on top of the regulator and the inductor. This way you can take them as high as 1V. The board will dissipate close to 70Watts at 1V.

Can you recommend a source for suitable heatsinks?

   maybe you like this heatsink but some said it's too tall http://www.ebay.com/itm/100x140x12-7mm-Aluminum-Heatsink-for-Electronic-Computer-Electric-equipment-H157-/181110341808?ssPageName=ADME:L:OC:CA:3160

i would beleive that you cant fill every slot on the board if using a heatsink taller than 8-10mm. i have some 35x35x6mm heatsinks on mine that easily allow airflow between every slot

  You can see someone sell 100x100x15mm for Hboard heatsink https://bitcointalk.org/index.php?topic=313594.0