TG's rendering speed does not scale well with the number of cores, but that is not a fundamental limitation of all rendering methods. Being our first pass at multi-threaded rendering, the current TG2 approach is not optimal. Although I doubt we will get to a true linear speedup with the addition of more cores, I think significant improvements can still be made, especially above 4 cores.
A Core i7 (Nehalem) quad core has 8 threads, but only *4 real cores*. Although Nehalem makes significant improvements in the "hyperthreading" technology used to process more threads per physical core, it will still never be equivalent to a true additional core. So while there may be 8 threads, you would perhaps get performance of 5 or 6 "cores". It's still a big improvement.
- Oshyan