'Theoretical maximum performance (FLOPS ) of Intel Xeon E5-2640 v4 CPU, using only addition?

I am confused about the theoretical maximum performance of the Intel Xeon E5-2640 v4 CPU (Boardwell-based). In this post, >800GFLOPS; in this post, about 200GFLOPS; in this post, 3.69GFLOPS per core, 147.70GFLOPS per computer. So what is the theoretical maximum performance of Intel Xeon E5-2640 v4 CPU?

Some specifications:

  • Processor Base Frequency = 2.4GHz;
  • Max turbo frequency = 3.4GHz;
  • IPC (instruction per cycle) = 2;
  • Instruction Set Extensions: AVX2, so #SIMD = 256/32 = 8;

I tried to compute the theoretical maximum FLOPS. Based on my understanding, it should be (Max turbo frequency) * (IPC) * (#SIMD), which is 3.4 * 2 * 8 = 54.4GFLOPS, is it right?

Should it be multiplied by 2 (due to the pipeline technique which makes addition and multiplication can be done in parallel)? What if additions and multiplications do not appear at the same time? (eg. if the workload only contains additions, is *2 appropriate?)

Besides, the above computation should be the maximum FLOPS per core, right?

cpuintelcpu-architectureavxflops


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