AMD multi-core programming

Question

I want to start to write applications(C++) that will utilize the additional cores to execute portions of the code that have a need to perform lots of calculations and whose

Answer 1

OpenMP and TBB are both available also for AMD - it is also a compiler question. E.g. see linux TBB on AMD.
I think the latest development on this end is to use the graphic card via CUDA or similar APIs- but this depends on the nature of your calculations. If it fits, it is faster than the CPU anyway.