So you're sick of just mining on your GPU, and not a fan of the electric bill after a month of mining? There has to be a better option out there than your loud GPU in your gaming computer. There is! Shortly after GPUs became popular for bitcoin mining, enterprising folks started looking at other things they can re-purpose to mine bitcoins more efficiently. Around mid-year 2011, the first devices sprang up that are called FPGAs or Field Programmable Gate Arrays. These are nothing new to the hobbyist community, they've been around for a while for crackers and other security-conscious folks looking at ways to defeat cryptographic locks. Hey! I know something that uses cryptographic calculations to secure its network! BITCOINS! Yep, so some miners developed their own boards and slapped some FPGA chips on them (most commonly the Spartan-6), and wrote specific firmware and "bitstreams" to more efficiently calculate bitcoin hashes. The first generations were sort of slow, but still they had better efficiency than a GPU. Some of the latest generation included the Icarus boards, Cairnsmore, x6500, and ModMiner Quad. In early 2012(i think my timeline is right), Butterfly Labs(BFL) was selling their own FPGA miner that hashed at 800 Mhash/s using 80 watts and only cost US$600 amazing! These grew very popular, but people could see that FPGAs still weren't the most efficient way to hash their shares. BFL then announced that they would be designing their own chips that would be orders of magnitude faster than anything ever seen. These would be the ASICs (or Application Specific Integrated Circuit)everyone is raving about. ASICs are--as the name implies--specifically designed for one thing, and one thing only. Bitcoins. This is all it can do, and can't really be repurposed like an FPGA to other applications. Who wouldn't want a US$150 "Jalapeno" that hashes at 3.5 GIGAhashes/s using only power from a USB port?? Crazy! So summer 2012, BFL says they will ship before Christmas. Various things happen and we now still don't have any confirmed ship dates from BFL. A few other companies have sprouted up, ASICminer which I believe is developing their own chips to mine themselves, but in a responsible way as to not threaten the network with a sudden influx of hashing. bASIC was a fiasco that was developed by the creator of the ModMiner Quad(which is actually a fantastic miner, I own one, and love it.) where he took many preorders, promised lots of people amazing ASIC performance, but in early 2013 the stress of the whole endeavour got to him and he gave up, refunded money(I think it's still being refunded now, or maybe it's been cleared up already.) Avalon is the only company we know has ASIC mining hardware in the wild. It is not certain exactly how many are out there, but they have been confirmed by independent sources. The Avalon units are expensive(75 BTC) and have been in limited production runs (or batches) of a few hundred units that were pre-sold out very quickly. All of this info is gleaned from the Custom Hardware forum over at bitcointalk.org over the past year or so I've been involved in bitcoin. I may have some facts wrong, but this is the gist of the situation and hopefully gives you an insight on the state of the hardware war against bitcoin Thanks for reading!
SELLING FPGA BITCOIN MINERS - MODMINER QUAD (Have a few left)
SELLING FPGA BITCOIN MINERS - MODMINER QUAD https://post.craigslist.org/imagepreview/m/3K43Me3J65L55E95Mcd41a17771ccf5591e55.jpghttps://post.craigslist.org/imagepreview/m/3Eb3Fb3Lc5I25G95Fbd41ec1e412c6c5b1b05.jpg The ModMiner Quad is a highly efficient FPGA Based Bitcoin Mining Device. Price - 2 BTC each (Lowered Price) - Only accepting Bitcoins! I'm selling some FPGA Bitcoin miners due to me making room for my ASIC coming in, so I can work out the prices on these. It features up to 4 Spartan-6 LX150 FPGA Chips that are Capable of doing up to 210Mhash each at 10 watts For a total Unit Speed & Efficiency of 800+mhash @ only 40 watts Compatible with the popular BFGMiner and CGMiner Bitcoin Mining Software Also many other people have found other uses for this great device, it will easily load any Bitstream / firmware you load onto it and be used for a plethora of other applications including protein folding , DNA mapping and pretty much any distributed computer project / algorithmic application or any other thing you can through at it. A truly multi purpose Spart-6 LX150 Device, this baby is idea for all kinds of distributed computer applications, hobbyist password cracking and many other applications If you would like a powerful long lasting and multi-purpose FPGA calculation device the Modminer Quad is for you! Contents: 1x Backplane 4x Spartan 6 LX150 FPGA cards with heatsinks + fans 1x USB miniUSB cable Features: 4x Spartan 6's 800+mhash @ ~ 40 watts USB interface for configuration and communication 72MHz ARM Cortex M3 for USB interface Our own custom Firmware Super easy firmware updating for the ARM chip Temp sensor on each FPGA card Heatsink w/ cooling fan on every card 4x 3-pin headers to power standard fans Draws from the 12V supply with 5A fuse at the Molex connector LEDs to indicate that the FPGAs are configured properly Modular design for seamless FPGA upgrades and repair Price - 2 BTC each (Lowered Price) Click here to order - https://payment.mtgox.com/4f4a7094-24e4-4cd6-947a-4ad6ad3ad856 My Cragislist Ad - https://post.craigslist.org/manage/3715775953
Bitcoin mining is a decentralized computational process, where transactions are verified and added to the public ledger, known as the blockchain. Nakamoto explains the working principles of Bitcoin mining in detail in his paper . Bitcoin networking started in 2009 with its unique currency Bitcoin or BTC. Modminer Quad Bitcoin mining device. How much does it cost in computing time/hardware to mine bitcoins? [duplicate] October 5, 2014 – 15:29. It really depends on how much you're willing to spend. Low end. Let's talk about the very smallest investment you could make for mining bitcoins: a Raspberry Pi. It can do 200, 000 hashes per second ... A variety of device drivers for Bitcoin (SHA256d): Butterfly Labs's BitForce SC (ASIC) product line; Avalon ASIC mining rig; Butterfly Labs's FPGA BitForce Singles and MiniRigs; Enterpoint's Cairnsmore1 FPGA mining board; FPGA Mining X6500; Qi Hardware's Icarus and Lancelot FPGA mining boards; BTCFPGA's ModMiner Quad FPGA-based mining device ... FS: ModMiner Quad bitcoin mining FPGA setup (820+MH, 40W) $1400obo, 20+ available BFGMiner 5.5.0 is a modular cryptocurrency miner written in C. BFGMiner has the ability to dynamically clock, monitor and remotely interface.. Pros: powerful miner with many features, cross-platform, including Raspberry Pi Cons: GPUs are not supported, suitable for more advanced users Platforms: Windows, Mac, Linux Unlike CGminer, BFGminer is designed specifically for FPGA and ASIC.
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