Draven35, you are a bit wrong on importance of Cuda cores, every generation can't be compared by it's count. For example by going from Fermi to Kepler the core count has tripled, but overall transistor count not so much, it has risen at about 15%, and the same with core overall frequency.
Quadro Fx4800 in single precision computation is truly comparable to the k2000, minus the open Gl 4.1 kapability, the older fx 4800 has open Gl 3.3. That's about it.