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Computational efficiency of current and near term CPUs and GPUs
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Real world Technologies – IBM’s Blue Gene/Q conclusively demonstrates that a CPU designed for throughput can match and even exceed the power efficiency of GPUs. There is still a gap in terms of area efficiency, but smaller than the data suggests given that Blue Gene/Q includes a large cache and robust interconnects that are not found in a GPU. This bodes relatively well for Intel’s Knights Corner, although the area problems might be worse with the overhead for x86 relative to PowerPC.
The best throughput processor (Fermi) has a 68% area and 77% power advantage compared to the best CPU (Ivy Bridge), despite using an older process technology. Excluding the GPU die area from Ivy Bridge, and the density advantage falls to a little under 10%. While the two design philosophies may be converging, they are also more clearly delineated as throughput processors have become more successful at handling double precision floating point. There are no cases of GPUs that are less efficient than CPUs.
See more and subscribe to NextBigFuture at 2012-07-28 08:55:01 Source: http://nextbigfuture.com/2012/07/computational-efficiency-of-current-and.html
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