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I'm going to pick up a couple extra BTC today. I may be able to take some PayPal payments (verified to the address they are shipping to) or a wire transfer.
I'm also gathering some info on DIY kits and bumping service. Are you guys interested in single chip USB miners or modular 16 chip card systems? I am working on single chip nano devices myself, and may be able to extend such services.
I'm also gathering some info on DIY kits and bumping service. Are you guys interested in single chip USB miners or modular 16 chip card systems? I am working on single chip nano devices myself, and may be able to extend such services.
I'm also looking into manufacturing a batch of single- or dual-chip USB miners.
Sh..t, I'm currently out of BTC and will not have anytime soon. Wire transfer? Anyone have BTC for sale directly? I have verified account on Mtgox but it takes days to found account there.
How much do you need?
we have lost btc no matter what we do, i filled out that trust thing on this site yall should do the same.
+1 for a scammer tag.
i hope john and castro OD as they are snorting drug using my money
+1 for a scammer tag.
i hope john and castro OD as they are snorting drug using my money
what website?
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Unfortunately to this day there is no documentation for bifury's chip. I started digging trough the forums and collecting various bits from here and putting the pieces together. I've put all of those notes in a wiki article - which uses the "docuwiki" format, and github wants the "mediawiki" format, so on my to-do list is to start reworking that. If there are any volunteers to help with that or know how to easily convert it - please PM me.
I'd like to help with the documentation. Please let me know what I could do.
BitMain?
May be an interesting option. Could conceivably fit 3 bitmain chips on a stick
Well with spray cooling you don't even need a heatsink. The advantage is that it can handle extremely high heat loads 90W/cm2 is possible and with subcooling that can reach 300W/cm2 or more. So pretty much insane power densities that would cause the component to melt with air cooling.
The disadvantage is that spray cooling requires some pretty incredible precision and if anything fails the chip will die in a matter of seconds (if that). IMHO immersion cooling is already pretty complex as DIY project anything beyond that is starting to get into a serious engineering challenge.
I guess my point is that with a heatsink and spraying, maybe you don't need the FC-72 because the liquid only needs to touch the heatsink and you don't have to worry about shorting things out. But yeah I can see the requirement on precision and complexity. It may not be worth it for a small scale shop.
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Some high end defense components use a third concept called spray cooling where a nozzle sprays fluid directly onto the chip.
I've actually been thinking about this. It may be possible to design a closed heat sink on top of the IC chips that encloses the metal fins, spray nozzle, and pipes to the pumps/condensers. That way you may be able to choose a fluid that causes less corrosion.
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The disadvantage of using Bitfury chips is the low "GH density". PCB size = 12cm x 12cm ? If boards are spaced 1cm apart = 144cm3. 42 GH per board. 0.29 GH/cm3 or 3.4 CC/GH. Fluorinert runs about $0.80 per CC ($80 per Liter), thus at 3.4 CC of fluid per GH the fluid cost is $2.72 per GH which is pretty high. The higher the GH density the less fluid needed per unit of hashpower and the more economical the system. My goal would be to get fluid costs to <$0.25 per GH and full system cost (excluding SHA-2 boards) <$0.50 per GH.
So it's really not the chip but rather the PCB design that is "low GH density". If we could redesign the PCB, it may achieve a much higher density and much smaller volume?
I've been looking for btc escrow services and it looks like there are very few. On the California Department of Commerce website, only four companies are listed as licensed internet escrow service providers and maybe one of them would be willing to deal with day-to-day online transactions.
Any idea what would be a legitimate (licensed) escrow provider for btcs?
Any idea what would be a legitimate (licensed) escrow provider for btcs?
Re: I really dont think bitcoin is going to be a day2day currency
I think the OP has a valid point. Anything requiring a third party goes against bitcoin's philosophy.
I don't think so, but for mainstream acceptance a little help from businesses is going to be needed. With anything that becomes popular capitalists will try to capitalise from it. People can chose not to pay with third-party merchants and just use straight transfer.
You also have a valid point. But on the other hand, having third part processors negates some advantages Bitcoins have, such as no chargeback...
Is it possible to do a USB miner with a BFL chip? I am guessing no since no one has done it and they are much more readily available than BF.
Might be possible, but with the BGA packaging they used makes them a lot harder to work with than the more hand-solder friendly packages like TQFP (with the leads sticking out the sides). Plus, BFL lists the chips as out of stock, so I imagine you'd have to buy them from someone who has them stocked up just like BitFury.
The BFL chips uses 3.2 W/GH/s so that's 12.8 W/chip for the 4GH/s chip. That doesn't fall within current USB specs but may be possible in the future.