Originally there was an H67 (with graphics), a P67 (for overclocking), and a z68 (for both).
However, now it seems like there is a whole slew of alterations to this chipsets and I'm looking for an explanation of each one and it's purpose or audience.
- H61/H67/HM67
- P43/P45/P55/P67
- Q57/QM57/Q67
- Z68