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FLOPS Of A Processor Calculator

Work out flops of a processor instantly with clear inputs, formula shown and shareable results.

About FLOPS Of A Processor Calculator

Peak FLOPS is clock times cores times FLOPs per cycle, where the last term comes from vector width and fused multiply-add: a 512-bit unit doing FMA on doubles gives 16 FLOPs, doubled to 32 with two units. Achieved efficiency of 60-80% on dense linear algebra is good; sparse workloads reach far less.

Formula

Peak FLOPS

peak = clock x cores x FLOPs per cycle; FMA counts as 2 FLOPs

Worked example

With the default values below, FLOPS Of A Processor Calculator returns Achieved throughput of 3,538.94. Change any input above and every figure here is recalculated in your browser.

Inputs used

Clock frequency
2.4 GHz
Cores
64 cores
FLOPs per cycle per core
32 FLOP
Achieved efficiency
72 %

Results

Achieved throughput
3,538.94 GFLOPS
Peak throughput
4,915.20 GFLOPS
Achieved throughput
3.54 TFLOPS
Peak per core
76.80 GFLOPS

Step by step

  1. 1Values used
  2. 2Peak FLOPS
  3. 3Achieved throughput= 3,538.94 GFLOPS
  4. 4Peak throughput= 4,915.20 GFLOPS
  5. 5Achieved throughput= 3.54 TFLOPS
  6. 6Peak per core= 76.80 GFLOPS

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Where does FLOPs per cycle come from?

Vector lanes times FMA factor times pipelines. AVX-512 with two FMA units gives 8 doubles x 2 x 2 = 32 FLOPs per cycle.

Why do real applications reach so little of peak?

Memory bandwidth. Most codes are bandwidth bound, not compute bound, so arithmetic intensity — FLOPs per byte moved — determines the achievable fraction.

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