What's a good C++ library for matrix operations

Question

I need to do multiplication on matrices. I\'m looking for a library that can do it fast. I\'m using the Visual C++ 2008 compiler and I have a core i7 860 so if the library i

Answer 1

FWIW, Eigen 3 uses threads (OpenMP) for matrix products (in reply to above statement about Eigen not using threads).