who can tell me sth about intel ESB2???

I never heard intel has B2 ES version,
typo? should be b3? or B1?

Actually there're some of Rev.B2 ES
I'd tested E6600 ES with Rev.B2. But overclocking performance is sucks thats for sure :PPP:
 
Intel ESB2 (6321ESB) I/O controller can support 2 64bit/133MHz PCI-X channel. ESB2 chip connects MCH with 2GB/s BW ESI bus. except ESI bus, one adding x8 PCI-Express will be used for communication too.