The parameters returned for you device appear to be correct. As far as cores are concerned CPU & GPU have different architecture and cores have different implications in each case.
Your core i7 should most probably be a 4 core system but shows 8 cores due to hyperthreading.
In GPUs a compute unit consistes of many stream processing units. Generally a compute unit has 80 spus(differnrt for NI devices) but cedar has 40spus per compute unit.