economists do then report merchants domains. Bitcoin has no central bank, no delay when sending money, and little, if any, transaction fees. A GPU is a large group of relatively dumb people who aren't individually very fast or smart, but who can be trained to do repetitive tasks, and collectively can be more productive just due to the sheer number of people. This translates to a raw ALU performance advantage for AMD: AMD Radeon HD 6990: 3072 ALUs x 8 billion 32-bit instruction per second.
Compare that to a 4-core CPU that can switch tasks on a dime, but has ALU's in some small multiple of four, if not just four ALU's alone. Performing 1000 element matrix addition is tiny amount of work thus you would be better off performing the entire computation on CPU instead. As a result, they can do large amounts of bulky mathematical labor in a greater quantity than CPU's.
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This operation can be implemented as a single hardware instruction on AMD GPUs (BIT_align_INT but requires three separate hardware instructions to be emulated on Nvidia GPUs (2 shifts 1 add). This is why comparing graphics cards by core count alone is not an accurate method of determining performance, and this is also why nVidia lags so far behind ATI in SHA-256 hashing. Or you need significant amount of work on CPU between starting GPU computation and getting the results back from GPU. The problem with CPU-GPU hybrid computations where you need the result back on CPU is the latency between the two. Secondly, another difference favoring Bitcoin mining on AMD GPUs instead of Nvidia's is that the mining algorithm is based on SHA-256, which makes heavy use of the 32-bit integer right rotate operation. Most mainstream computers have much slower but less power consuming and cheaper IGPs (Integrated Graphics Processor which are GPUs as well but integrated directly into the chipset and soldered onto the motherboard, rather than separate, more powerful but power consuming AGP or PCIe cards with. Link to website with program download: m/km6n4x4, link to AMD GPU miner: m/km6n4x4 best bitcoin mining, meta tags: Asic Asic Miner Asic Mining asic Scrypt asic Scrypt Miner Big Bit Bitcoin Bitcoin Miner Bitcoin Mining Dual Miner GC3355 Gridseed Hybrid Miner Lil Bit Litecoin asic. Analogy, one way to visualize it is a CPU works like a small group of very smart people who can quickly do any task given to them.
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