Topic: Black Arrow 28nm 100Ghash Bitcoin ASIC from $0.49/GH/s - page 99. (Read 787050 times)

+1 for MartoMiners
You should be able to do 120 @ 1w/gh, the X1s I have are doing 120 @ 110w and that includes controller and fan

Good to know. Thanks.

They go up to 120 per chip but the power consumption is going up
I like MartoMiners ^TM BTW

I am just going by my 360mm heater core radiator performance, I have dumped 1KW on it by watercooling a condensor before without problems. It is a matter of having the right water and airflow. I had 4 fans in pushpull so I was just using 240mm of the radiator and a 1000L/h pump and was just about 15ºC over ambient....

From Black Arrow, maybe, but these MartoMiners^TM are doing a pretty steady 400 GH/s. I haven't seen one go higher. Can anyone refute this?

If your going to watercool your board keep in mind that its very bad to combine aluminium and copper in the same loop !!!!!!
The aluminium will be desolved in time by the copper..

i have been watercooling my PC for almost 10 years now..

I seriously doubt one of those 240mm rads will handle 400w very well..

Do you have any figures to back it up?

Those radiators are really nice, even only one should perform quite well with 4 minions but I wouldn't use that pump. If you want to save more or anyone else is building a watercooling, a car heater radiator performs just as well as the most expensive computer radiators.

A koi pond pump would beat the crap out of it for about the same price. Just one of those pumps could service 30 minions in a properly designed setup.

I am developing a dual purpose phase change evaporator / waterblock and if you are interested I could hook you up with a prototype.
The current one is underperforming in the flow ressistance tests with water but I have narrowed down the problem and I am working on a solution.

I hope to reach my performance targets soon but meeting the needs of phasechange, watercooling and having a cheap and easy to assemble design is hard.

I think that watercooling is quite practical and a good investment due to the reuse factor, I have been using the same pump and radiator since year 2000 and even my original aluminium waterblock would have suficed with reduced performance but stil better than air.
In a crowded datacenter it would make even more sense as you could reduce the air conditioning bill by a lot if you place the radiator outside and you could use car or truck radiators with a nice and big pump (or several in parallel to increase the reliability).  It can also be cheap, as I have said the pumps and radiators can be shared and cheaper that those sold by computer companies and if you diy the waterblocks it is not expensive at all.

seems like if it was so easy to slap the chips together black arrow would do it . I don't really know anything technically but from a business point of view it seems pretty sketchy . To the guy taking a loan i would advise against it , you could sell your chips around 25 bux and buy around 12 s3's. To me something so risky isn't a good idea with borrowed money but i guess you could go for the gold!!!

Like to know where to reach you guys and how to order some samples IC's

please reply to [email protected]

Either buy a 9x120mm and or a 4x120mm radiator - with proper thickness and heat removal capabilities.

If you can put enough air through the 9x120mm, and run a few loops it should be possible to cool 2x4minion boards.

Remember a good size tank also.

Actually around 22 - 24 TH/s depends on the luck.

200 chips is 20 TH/s, not 25. I hope that doesn't douse your campfire.

Go big or go home. I like it.

 I ask again... Is it possible for 2 of your dell power supplies to pull off 3 of them. I truly believe so, and as a buyer of them, I want to know if I buy 18 of them that I have enough power.....

 Actually, yank the fans, and stack em up.. that is the plan. Providing MS sends the chips...

 Point taken. But did you consider most bilge pumps don't run mineral oil through them, that constantly lubes? I know it seems trivial, but it in fact holds true. I bought 7 asic eruptor boards in October and they still cool as shit and making money now. Don't believe me? Plug em in at 350 watts on your calc. Sure, its a mere .52 cents a day, at .08 per kw. You realize how much that is over their life span? Over 7 BTC is what I made and cost me a mere .956 BTC.

 Point being... A bilge pump with clean oil running through it can run 100 times longer than water with shit in it. This is my mere experience with them.

I never thought my rating as a US Coast Guard licensed captain would have a use on this board, however here goes:

While the flow rating on bilge pumps is higher they are designed to be activated by a float switch and then rapidly clear water from the hull of a vessel. Once the water is gone they shut off. The upshot of it all is your average Rule bilge pump is not rated for continuous operation. Running it 24x7 I would not be shocked if it burned out within a month. Your mileage may vary and it's been 5 years since I worked the water - but a pond circulator pump seems way better.

 Ok, explain to me why 25 th/s for 25k sounds bad. First off. I spent 12k months ago. Matt, and Minersource have been good to me. I believe in them, and they have always stood behind their word. Since Matt brought Dan in, shit getting taken care of.

 Call them man, talk to them, they good folk.

 This is merely my take, and the fact they have taken the time to right a bad situation shows they truly care about their customers.

 Now, back to the point. Will 2 dells do 3 boards. I seriously believe so. His PSU's can be pushed to the max, and deliver. I have 6 of them.

 50 boards as I have requested would be 25k+-5% watts. That is a serious load for a house. That's why I have 3 colo's. I am already pulling 20 from here.

 Wally World has Bilge pums for dirt cheap, and their flow is 10x better. CMON!