Quote:
Originally Posted by axn
Unlikely that 560K result has anything to do with memory. The i9 is a 20MB L3 part so the whole FFT should be running entirely from L3 and shouldn't be hitting RAM at all. Probably just seeing multi-threading overhead (particularly since it is such a small FFT size).
Upto 20/8 = 2.5M FFT (or slight smaller to account for other overheads) should run entirely within L3.
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Is it possible the L3 bandwidth limit is being hit?