I'm looking for the best intel motherboard for the core i7-2600k. I'm thinking P67 extreme series goes best with it. but when i search for the actual price online many kinds of model comes up. is DP67BG board the same with BOXDP67BGB3 or BLKDP67 something? and where can i buy the cheapest and most reliable source online? thanks in advance.
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Currently, either a P67 or Z68 Intel Chipset MOBO is the minimum requirement. From there it gets more complicated, it depends on your 'target' aka desired OC 'GHz'. For 4.0GHz~4.5GHz I recommend a minimum of an 8 Phase MOBO, and >4.5GHz a 12 Phase minimum.
In general, Intel produces poor LGA 1155 overclocking MOBOs, and some of their P67 have lacked the basic settings e.g. CPU Ratio/Multiplier to even allow any overclocking.
Buying depends on your location, in North America (USA and Canada) most folks use http://www.newegg.com/ - its a highly rated and very consumer friendly site.