I haven't seen anything making me believe that a C2Q can produce more than twice what an X2 6000+ can do on FAH. Also, I doubt the 30% advantage that 4MB L2 cache Core 2 units have over the 2MB version. If that was the case, Bozo (who has a 3.2GHz Core 2 Duo with 4MB L2 cache) would be running back on me like a rabbit racing with a turtle. My main system uses a Core 2 Duo with 2MB L2 cache clocked at 2.72GHz. I also have two other systems producing ~3000 points per week together. Bozo has 6 CPUs (more than I do) working for him too, so that must make it at least kif-kif with my two other systems. Well, despite his higher clock and his 4MB L2 cache, I beat him by 800 points last week. So I think the tremendous advantage that larger cache Core 2 chips are rumored to have is greatly exagerated.
In the Tech Report article comparing some 20 different processors, they also tested FAH production. I know that the SMP client wasn't tested, but pretty much all the other clients/cores were and the X2 fared quite well against the Core 2. The 4MB Core 2 weren't a lot better than the 2MB versions there either. I don't see why the SMP client should favor the Core 2 that much compared to the X2 architecture. With 2 cores clocked at 3.0GHz each, I would guess that an Athlon 64 X2 6000+ should do at least half of what a Core 2 Quad can produce for FAH.
I might be wrong, but what I see right now doesn't let me that a 6000+ is that bad an investment compared to what Intel has to offer from an FAH perspective.
P.S. Sorry if I'm hard to read. I haven't been able to sleep during the last two days.