One of Nvidia's arguments is that there are few HPC applications that benefit from >4cores that don't benefit much more from a good GPU implementation. Therefo

One of Nvidia's arguments is that there are few HPC applications that benefit from >4cores that don't benefit much more from a good GPU implementation. Therefore, an optimal configuration is to have a reasonable 4-core CPU with really good serial performance/watt directing GPUs with amazing parallel performance/watt. That design definitely echoes the Cell concept.