The PRO3 reduces the overhead incurred by common "brute-force" architectures by using the least-required hardware resources for certain common well-defined tasks.
Citation:
Ioannis Papaefstathiou, Stylianos Perissakis, Theofanis G. Orphanoudakis, Nikos A. Nikolaou, George Kornaros, Nicholas A. Zervos, George Konstantoulakis, Dionisios N. Pnevmatikatos, Kyriakos Vlachos, "PRO3: A Hybrid NPU Architecture," IEEE Micro, vol. 24, no. 5, pp. 20-33, Sep./Oct. 2004, doi:10.1109/MM.2004.55