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Intel Core i7-4790K testing with a ASUS SABERTOOTH Z97 MARK 2 and MSI NVIDIA GeForce GTX 760 2048MB on Ubuntu 14.04 via the Phoronix Test Suite.
HTML result view exported from: https://openbenchmarking.org/result/1702272-RI-L6907128841&sro.
FFTW
Build: Float + SSE - Size: 1D FFT Size 2048
FFTW
Build: Float + SSE - Size: 1D FFT Size 4096
Phoronix Test Suite v10.8.5