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Original author: 
Cyrus Farivar

Aurich Lawson

This is the first in a two-part series exploring Butterfly Labs and its lineup of dedicated Bitcoin-mining hardware. In part one, we look at the company and the experiences customers have had with it. In part two, to be published on June 29, we share our experiences running a Bitcoin miner for a couple weeks. Spoiler alert: we made money.

The more I dig into Bitcoin, the stranger it gets. There’s gray-market online gambling and Russian-operated futures markets—to say nothing of the virtual currency’s wild ride over the last several months. It’s full of characters with names like “artforz” and “Tycho,” supposedly two of the largest Bitcoin holders out there. Of course, like most things Bitcoin, it’s nearly impossible to know for sure.

While reporting on a Bitcoin-based gambling story earlier this year, I interviewed Bryan Micon, who works with a Bitcoin-based poker site called Seals With Clubs. (To continue the lack of information, Micon won’t say who owns the site.) Micon has taken it upon himself to investigate what he believes are Bitcoin-related scams—such as the ill-fated Bitcoin Savings and Trust online bank—and he makes public pronouncements about them.

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Original author: 
Soulskill

CowboyRobot writes "Two researchers at San Francisco State University has successfully implemented hardware acceleration for realtime audio using graphics processing units (GPUs). 'Suppose you are simulating a metallic plate to generate gong or cymbal-like sounds. By changing the surface area for the same object, you can generate sound corresponding to cymbals or gongs of different sizes. Using the same model, you may also vary the way in which you excite the metallic plate — to generate sounds that result from hitting the plate with a soft mallet, a hard drumstick, or from bowing. By changing these parameters, you may even simulate nonexistent materials or physically impossible geometries or excitation methods. There are various approaches to physical modeling sound synthesis. One such approach, studied extensively by Stefan Bilbao, uses the finite difference approximation to simulate the vibrations of plates and membranes. The finite difference simulation produces realistic and dynamic sounds (examples can be found here). Realtime finite difference-based simulations of large models are typically too computationally-intensive to run on CPUs. In our work, we have implemented finite difference simulations in realtime on GPUs.'"

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Original author: 
Lee Hutchinson

Apparently, I'm a Bitcoin miner now, and it looks like I'm actually pretty good at it. Ars is currently in possession of one of the elusive but very real Butterfly Labs Bitcoin Miners. It's a tiny little black box that fits in the palm of my hand, and it contains a specialized ASIC adept at chewing through SHA-256 cryptographic functions—exactly the kind of calculations necessary to bring more Bitcoins into the world. Turns out, it's very good at what it does: it computes hashes at the rate of about 5.3 billion per second.


The Butterfly Labs Bitcoin Miner. Lee Hutchinson


Close-up of the ASIC's heat sink and some of the motherboard components. Lee Hutchinson


The Miner disassembled. That 80mm fan gets pretty darn loud. Lee Hutchinson

I've got any number of computers around the house here to try the Butterfly Labs box out with, but I took the masochistic route and chose to try it out on OS X. This took quite a bit of back-and-forth with John O'Mara, creator of the popular MacMiner Bitcoin mining application. After several hours of troubleshooting, we eventually arrived at success. Here it is, happily churning away:


The Butterfly Labs Bitcoin Miner chewing its way through calculations at more than five billion hashes per second. Lee Hutchinson

According to my trusty Kill-A-Watt, the miner is drawing a pretty constant 50 watts at a similarly constant 0.73 amps. Its 80mm fan is whirring at what can only be described as "hair dryer" levels. According to MacMiner, the ASIC is generating a fair amount of heat, too—it's reporting a temperature of more than 80C.

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KermMartian writes "In what seems to be an accelerating arms race for graphing calculator supremacy between Texas Instruments and Casio, the underdog Casio has fired a return salvo to the recently-announced TI-84 Plus C Silver Edition. The new ClassPad fx-CP400 has a massive color touchscreen and a Matlab-esque CAS. Though not accepted on the SAT/ACT, will such a powerful device gain a strong following among engineers and professionals?"

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