Let's pretend for half a second that cinebench is sorta a good indicator of how a system might perform with the firefly multithreaded renderer.  An E6400 overclocked to 3.6 is right below a QX6700 at stock.  It was like 1107 pts vs 1397 pts I belive (this was on dfi-street).  My current Opteron 170 @ 2.6 = 717 pts.

An e6400 setup might run you 700-800 bones theres about depending on how much you want to pirate from your old system.

The multithreading of the renderer was worth the upgrade price, considering I am too lazy to put my scenes in another software :D. 

I guess to summarize.  A e6400 system is a worthy upgrade for poser if you got the cash especially if you OC the crap outta it.

-G