10
yes. the more core u have the faster the render time. if u can, please maximise ur RAM also. use performance ram - (kingston HyperX 4Gb x 4 = RM 4++) i think that brand is the most cheapest n reliable one. If the Ram is sufficent enough, u can still do a post-production work on PS while u are rendering. That will save u more time! Good luck.
ps: u can also overclock the processor if u are use to it, but as well u must invest in some good cooling system.