As others have said Celeron M's are mobile, and Celeron D is desktop. M=mobile, D=desktop (not the technical name, but helps to remember it by).
The Celeron M's are much better then the D's, mainly because they are low-end Pentium M's, vs low end Pentium 4's.
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Core 2 Quad Q9550 @ 4.1GHz
Asus Rampage Formula X48
ATI 4870X2 2GB GDDR5 (800/1900)
4GB (2x2GB) DDR2 960
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Creative SB X-Fi Titanium Fatal1ty
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