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Difference between libmkl_mc.so and libmkl_mc3.so

What is the actual difference between libmkl_mc.so and libmkl_mc3.so. Moreover, How to do you which SSE version is linked to libmkl_mc3.so

When I force the code to use SSE4.1, by this command. mkl_cbwr_set(MKL_CBWR_SSE4_1). Then libmkl_mc.so is being used and the performance is better. But if I don't force it, the code simply uses libmkl_mc3.so and the performance is bad.

Can anyone explain me what actually the difference is?

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Gennady_F_Intel
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 libmkl_mc3.so supports SSE4.2 instruction set - for example for Nehalem microarchitecture but  libmkl_mc.so supports SSE4.1. 

Do you know the CPU type are you running your code?

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