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GPUs are highly specialized: they are very good at a very small number of things, but they are extremely bad at everything else.
CPUs are general: they are mediocre at everything.
GPUs are good at applying the same operation out of a small number of potential operations, and in particular, the same very simple operation to a lot of identical things. E.g. ...
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Every machine instruction encodes the source and destination registers and/or memory locations. For memory location, some temporary buffer (register) within the processor is used. If the memory location happened to be in the cache, the stage of pipeline which depends on the content of memory location, stalls for few cycles.
Also, there are buffer registers ...
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The basic architecture of CPU and GPU are different. Modern CPU's consist of a set of cores. Each core has its own a set of registers, a ALU and a control unit with some private cache. In a CPU the number of ALU's (the actual processor) is in 1-100 range. In a GPU number of ALU's are in thousands. The register files are larger and is shared among multiple ...
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