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[Apokalipse]

Only neat if you get more than 25% higher frequencies. I doubt that doubling the FPUs would make a big hit on frequencies.

Doubling the FPU's takes massively more die area, meaning more power usage, and you can't clock it as high if you want to remain within a certain TDP.

The FPUs count for a very small part of total die area

Floating point units are much more complex than integer units, and take up much more die area.
instruction sets like SSE, AVX use the FPU primarily.