Mac Pro 8 Cores in Action

Officially, the 8-Core-based Mac Pro does not exist. However, getting 2 QuadCore Xeon from Intel and installing them in the current Mac Pro is the way to get a 8-Core-powered Mac Pro quite easily (does not mean it is cheap).
ZDnet has installed 2 Quad Core Xeon 5355 clocked at 2.66GHz in a Mac Pro originally powered by 2 Dual Core Xeon 3.0GHz.
Results are following our expectations and the theory. Only applications able to benefit from multicore architecture sees improved performance when moving from 4-Core @ 3.0GHz to 8-Core @ 2.66GHz. Only Cinebench is really boosted by doubling number of Cores.
This proves that one will first need to optimize both code and applications to really benefit of architecture with more than 2 or 4 Cores. Otherwise multicore CPU will become the new default marketing argument as MHz has been in the past.