From memory:
A Nehalem at 3700mhz= 26,000+ a day in WCG
8 core Clovertown at 3000=23,000 a day
8 core harper at 3600= 34,000 a day
dual opty,8 core, = app 11-12,000 a day in WCG

Now a 8 core gainstown at 3200mhz should do right around 50,000 a day in WCG..

That's it in a nutshell..