x264 t_mod x86/x64 - which variant?

[bencuri]

I would like to use this version of x264.exe:
x264 t_mod x86/x64 8bits/10bits posix/Win32threads
(https://github.com/jpsdr/x264/releases)

The zip file you can download contains 3 variants:
mcf, posix, winthread

What do those things mean and which variant do I need for this setup?

CPU: Intel® Core™ i5-3210M
OS: Win 7 64 bit

[jpsdr]

The different versions are not CPU related, but just build with different GCC version and threading model.
mcf is the faster, but we are talking of a no more 1%-2% speed difference (at least on my tests).
So i advise mcf. Different builds are just safe options in the very improbable case, there would be some kind of issue with one specific build.