Here is the basic information on our chipsets anything outside of this is most likely a board level change.
This should help
http://ark.intel.com/compare/52812,52807,52806,52810,52816 but here is some clearer information.
H61: Entry level very basic set up. These will be the lowest cost boards. They do support the IGP (Intergraded Graphic on processor). The H61 will not allow you to overclock a “K” series unlocked processors.
H67: This is the general use chipset. This is the board that should be used in most system. The H67 does support the IGP. H67 will not allow overclocking and it will support a board level of features. This board may have support for RAID.
Q67: A business board the only thing that you really need to know about this is this is the board to get if you need support for VT-d. Q67 will not allow overclocking and it will support the IGP. This board may have support for RAID.
P67: The P67 boards are the only ones that cannot support the IGP at all. These are designed to be performance level boards and they do allow overclocking of the unlocked processors. This board may have support for RAID.
Z68: This chipset is just like the P67 with 2 changes. First is support for Intel SRT (Smart Response Technology) which allows you to do some SSD caching. The second feature of the Z68 that is different from the P67 is that it does support the IGP (at least most of the boards do). This board will allow overclocking of the unlocked processors. This board may have support for RAID.
If you are a gamer get a P67 or Z68 board.
Christian Wood
Intel Enthusiast Team