Originally posted by chuckula
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I would agree there does not seem to be any commonality but equally there were a number of questionable setups: binutils using an older version (not switched), RAM was incorrectly timed (this is a common issue with alot of ryzen setups if the BIOS is just used to autoset - I activated XMP to get RAM timings)
GCC has been very suspect:
Haswell for GCC-5.x has been shown to be bad
GCC-6.x (1st with znver1) is non-optimised (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80313)
GCC-7.1 so far is quite nice & a couple of us are using 7.1
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