Topic: ANN: BITMAIN has Tested Its 28nm Bitcoin Mining Chip BM1382 - page 5. (Read 143992 times)

I guess I don't understand why there are leads to every pin on the connector, rather than just the ones needed to turn on the PSU.  Is it safe to assume those leads would be live, and have current running through them?  I'm no EE, I'm just curious if there is a chance that those front-facing leads could be shorted inadvertently.

AntMiner Jumper Switch- Bitcoin Miner Accessory

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PC Power Supply has been widely used to power Bitcoin Miners, but users have to use the paper clip or other metal line to short blue line and black line of the PSU 24 pin interface before powering Bitcoin Miners. It is troublesome thing to short lines, and may lead to unstable power supply.

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Sorry I meant S2
Yeah, still waiting ? what for ?
until there gonna be no point to upgrade, unprofitable 
if here is someone thinking to buy forget about it
You will never get ROI
maybe first batches of S1 but now NEVER ROI
or you might like flash money down the toilet as me 6xS2 and 2xSP10
Bitmaintech, Spondoolies clever guys
Cheers happy mining

How you guys tracked it?

If you meant an upgrade from S1, then its waiting announcement from bitmaintech.

Any news about upgrade S2 ?

I can confirm that, got my notification and the package is moving.

Batch 4 is now shipping 

Cool list, Aztecminer.

It seems like that would power 2 S3s & still have some room for O/Cing? I looked but couldn't find how many PCI-E connectors it had... It looks like 6 in the photo.

If it's a pad (as opposed to a copper shim which is kind of useless as a TIM) it's almost certainly a graphite sheet like this one.
http://www.digikey.com/product-detail/en/A10462-03/926-1008-ND/2268505
240W/mK, but only in the x-y direction. If you look at the datasheet, it has 5W/mK, which will be much worse than a standard paste as a thermal interface between chip and heatsink. They're used as heat spreaders.

8.5W/mK is fine for a thermal paste, the bulk conductivity is almost a meaningless measurement. Keep in mind that the bulk thermal impedance (in degrees C (or K) per watt) is distance / (area * conductivity). If your surfaces are pretty small and you have a bit of pressure, the bond line (distance between the heatsink and chip) can be on the order of 1 mil (0.0254mm). Even at 0.1mm and for something like a VRM chip with a 1~cm square chip, 8.4W/mK is a temperature rise of 0.12C per watt. Even if you had a paste that was rated at 1W/mK it'd only be a 1K/W temperature rise, which when you're only looking to dissipate a few watts is essentially meaningless.

Even for the main board (assuming it's around 120mm x 250mm or so like the S1 board) it doesn't make a difference there. Even if your gap is 1mm (which is huge), that's still 0.001m/(.12m*.25m*8.4W/mK) = 0.004K/W. Sure there's some simplifications assuming a fairly even distribution of heat in the board, but for 200W per board you'd still only be looking at a 0.8C rise over the thermal compound.

tl;dr, the bulk conductivity of a paste is almost meaningless. What really matters is how well it wets the surface and how small a bond line it can give you. How well it resists pumping out is important too, but not so much in mining equipment that should run at temperature 24/7. For something like the interface from the board to the heatsink for an S3, you'll want something that has a fairly low viscosity and spreads really well, since you'll have pressure points at the screw heads instead of nice even pressure, and getting a consistent amount of TIM across the whole board would be a challenge.

I received my refund  , there was a delay in UPS shipment do to their mistake , in the ups tracking link it is written:
A UPS error has delayed delivery. We're adjusting plans and working to deliver your package as quickly as possible.

For one Antminer S3 Corsair CX750 is more than enough. This is an entry level which has higher Ampere rating at +12V rail.
CX750 non-modular version is devised with a single +12V 46A rail which gives 552W.
It has four PCI-E Sleeved cable connectors which is enough for a single Antminer S3 even if you are overclocking.
It gives above 88% efficiency at 230VAC and above 85% efficiency at 115VAC when loaded at 50% to 60% load.
So, the Antminer S3 at 330Watts clock speed will give the most efficient performance level.

i see you said thermal plates, i read it as thermal paste .. well you can buy copper thermal shims too which are basically copper plates:

http://www.amazon.com/Vktech-Heatsink-Copper-Thermal-15mmx15mm/dp/B00E5SMY0W/ref=sr_1_4?ie=UTF8&qid=1406561893&sr=8-4&keywords=copper+thermal+shims
"The copper has high purity coefficient of thermal conductivity as high as 407 w/ (m•K)"

our problem though is the S3 case does now allow as much air flow on the outside where we want to cool ..
copper needs to be air cooled because it does not dissipate the heat as fast as aluminum..
therefore in our application aluminum heat sinks will be best on the other chips we need to cool..
for the asic chips under the aluminum heat sink i think a good thermal paste is best.
even if you use your thermal plates you still will need a thermal paste between the chip and the plate .

Can anyone suggest if this is a good PSU for 1 S3?

Corsair CX750 Builder Series ATX 80 PLUS Bronze Certified Power Supply.

Here we go
Check this PDF catalog: http://www.heatmanagement.com/local/media/pdfs/Kunze_ProductCatalogue-2014.pdf
I (our EE) was talking about the pad on page 80 !!

There are even bether ones on page 94 mage with carbon !

Hope this helps

Please ask...Picture(s) will help too...

Thanks

Customs or UPS are building a farm, they don't pay for electricity in their office.

I have to ask our EE in the Office for more info on Monday.

@ aztecminer: It IS electricity conductive .. BUT since it is NOT a paste, there should be no Problem with that
as long it is cut the right size

There appear to be a number of miners caught up at UPS in Shenzhen. Even many batch 1 miners are still there.

the chip wouldn't be well-suited; even a 2A USB 3.0 port would only provide 24w, or maybe 30GH using two chips.  It would probably cost over $60 in bulk and require forced air cooling. a typical USB 2.0 (500mA) such as with the U2 would only provide 1/10th that power though and would require costs of ~$12/GH to produce