Cell microprocessor implementations: Difference between revisions

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On 12th of March 2007, IBM announced that it started producing 65nm Cells in its East Fishkill fab. The chips produced there are apparently only for IBMs own Cell [[Computing blade|blade]] servers, which were the first to get the 65nm Cells. Sony introduced the third generation of the PS3 in November 2007, the 40GB model without PS2-compatibility which was [http://www.engadget.com/2007/10/30/40gb-ps3-features-65nm-chips-lower-power-consumption/ confirmed] to use the 65nm Cell. Thanks to the shrunk Cell, power consumption was reduced from 200W to 135W.
 
At first it was only known that the 65nm-Cells clock up to 6 GHz and run on 1.3V core voltage, as [http://news.spong.com/article/11413?cb=936 demonstrated] on the [[ISSCC]] 2007. This would have given the chip a theoretical peak performance of 384 GFLOPS in single precision, a significant improvement to the 204.8 GFLOPS peak that a 90nm 3.2 GHz Cell could provide with 8 active SPUs. IBM further announced it implemented new power-saving features and a dual power supply for the SRAM array. This version was not yet the long-rumoured "Cell+" with enhanced Double Precision floating point performance, which first saw the light of day mid 2008 in the [[IBM_Roadrunner|Roadrunner supercomputer]] in the form of [[QS22#Cell_based_Blades|QS22]] PowerXCell blades. Although IBM talked about and even showed higher-clocked Cells before, clock speed has remained constant at 3.2 GHz, even for the double precision enabled "Cell+" of the Roadrunner. By keeping clockspeed constant, IBM has instead opted to reduce power consumption, something they were not shy to point out in the current trend of "Green computing". Among other things this is the reason why Cell-based clusters now, as of late 2008, dominate the [[Green500]], which measures the MegaFLOPS per Watt, with a significant lead of 488 MFLOPS/Watt. PowerXCell clusters even best IBMs BlueGeneBlue Gene clusters (371 MFLOPS/Watt), which are far more power-efficient already than clusters made up of conventional CPUs (265 MFLOPS/Watt and lower).
 
===Future editions in CMOS===