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[Apokalipse]

Each module has two integer cores and two 128-bit FPU's.
the two 128-bit FPU's belong to two cores. They just have a single FP scheduler.

It means fewer transistors used, as well as allowing one 256-bit AVX instruction (decoded into two 128-bit micro-ops) to run on both 128-bit FP pipelines simultaneously.
Thus 256-bit AVX can complete in one cycle while at the same time keeping each core's FP pipeline 128-bit

Having a 256b FP pipeline per core would be faster than using modules if therere enough 256b instructions in enough threads. However, it would be a massive increase in die area for a tiny performance gain.

One thing Bulldozer also has is a combined multiply-add instruction, which takes half the time of separate multiply and add instructions (and also has higher precision).
SB has 256-bit FP pipelines per core, but lacks a combined multiply-add instruction.