if you find no argument for the x58 then the difference between the two is irrelevant to your needs - so you choose p55. very simple.
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Sounds like you may not have found decent reviews of the two types of boads.
Max RAM, dual channel, SLI (number of 16x slots), plus whether 9xx and above vs P55 based chips.
I found this one very informative:
"... review based upon Intel’s new DP55WG motherboard designed for the Media Center PC crowd and featuring the new SATA 3 controller
Core i5 750 review
Thank you Gregg, the provided URLs helped a great deal making my decision for an Intel DP55KG Board.
Nico, the reasoning you have provided here is useless.
Anyhow, thanks for your effort.
that simply means you had your answer before the question was posted - just as i thought. take it easy ;-)