hduregger

Where does factor 2 in peak GFLOPS calculation come from?

Discussion created by hduregger on Aug 1, 2011
Latest reply on Aug 1, 2011 by hduregger

I am looking at the programming guide and the ISA manual but I just can't figure out where the additional factor 2 comes from.

e.g. for the 6970 the peak is given as StreamCores * ALUs * EngineSpeed * 2 / 1000 = ProcessingElements * EngineSpeed * 2 / 1000 = 384 * 4 * 880 MHz * 2 / 1000 = 1536 * 880 MHz * 2 / 1000 = 2703.36 GFLOPS. I thought I would understand the architecture quite well by now. But that factor 2 keeps me puzzled.

Others on these forums also included that factor in their computations.

Can someone please give me a hint where it comes from?

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