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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
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All the non 6* chicpsets aren't "SB" chipsets. – inf Jan 9 '12 at 17:52
    
What @bamboon said - those aren't Sandy Bridge at all. For the record, 'M' just indicates a mobile (read: laptop) variant. – Shinrai Jan 9 '12 at 18:00

Look for the cougar point products page at ark.intel.com and compare them. Have a look at Wikipedia.

As you'll see the differences concern FDI support, CPU overclocking, USB and SATA ports number, PCI support, etc.

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