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Old 2014-07-28, 05:55   #3
axn
 
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Jun 2003

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It is well known that AVX processors are very dependent on memory bandwidth (especially for larger FFTs). My 3GHz Ivy bridge can do a 448K FFT of similar bit length (SR5) in just over half the time (about 13500s).

My best guess is that your memory is not running in dual-channel mode. Or it is just very slow. What is your memory spec/configuration?

Last fiddled with by axn on 2014-07-28 at 05:56
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