Its running at 3.7Ghz. I don’t remember under-clocking it. But CPU-z doesn’t lie (i guess).
Is your machine running at 3.9GHz? That would explain the difference.
I knew that there was a difference between Linux and Win, but i wasn’t sure if it isn’t driver related or something else. This is a drastic difference.
That definitely means i will render on Linux in the future if it is ~14% faster.
No wonder all these Hollywood Renderfarms are running on Linux.
The frequency depends on how the BIOS is configured. You may have modified something manually, or chosen some predefined profile that under clocked the CPU, as can be some profile for energy saving.
Yes, I did the benchmark with CPU stock clock, running at 3.9GHz in turbo.
If you have a decent air cooler, you can easily overclocking your “k” CPU model at 4.6GHz. Even more with a good water cooling system.
Regarding industry, I have read Houdini users talk about a big difference in performance in favor of Linux.
Windows 7 Pro 64bit
i7-3930K @ 3.2GHz (stock)
04:46:82
Ubuntu 16.04 LTS 64
Intel Xeon E5607 2.27GHz (stock)
16:47.70
Windows 10 Home x64
i5 2500 @ 3.4GHz (stock)
11:06.85
7-year-old CPU, boyeee!
OSX 10.11.6
i7 5820K 4.2Hz 
3:13:92
Windows 10 Pro
i5-2500K @4.2Ghz (OC)
09:04:90
Windows 10 x64 1709
i7 6700K @ 4.5 GHz (4 GHz stock)
4:40.00
weird time I know, but that was the result. Lobber finished just 300 ms faster.
Windows 7 Pro x64
Intel i7 4771 @3.5GHz (stock)
06:13.82
Windows 10 Pro x64
Official 2.79 release
Intel i7 2700K 16GB ram
06:10.36
(New CPU)
Windows 10 Home x64
Intel i5 8600K @3.6GHz (stock)
04:37.82
Windows 10 Home x64
AMD FX8350 @ 4GHz (Stock)
8:12.22
Windows 10 Pro x64
Dual Intel Xeon E5-2660v2 @ 2.2GHz (Stock)
2:04.73
Xubuntu 17.04
Dual Intel Xeon E5-2660v2 @2.2GHz (Stock)
1:43.35
(same computer as above, different OS)
windows 7x64
Dual Intel Xeon E5-2650v3 @2.3GHz
1:48.55
blender 2.79
ubuntu 16.04 LTS
core i7 4770
05:24.79
(Upgrade to High Sierra 10.13.1)
OSX 10.13.1
i7 5820K @ 4.0
02:52:14
Truly impressive!
Windows 10 pro 64bit
AMD threadripper 1920x @3,7 GHZ
01:51:62
