Confusion on MBP model and specs

[TheSiege]

My mothers MBP says its model : MC516xx/A
But this site has the specs listed differently
http://support.apple.com/kb/ht1635

But the specs on the computer say:
2.66 GHz Intel Core 2 Duo
4 GB 1067 MHz DDR3
NVIDIA GeForce 320M 256MB

I am a PC guy so I don't know much. Any help would be great, we just want to get the info straight so we can sell it.

 

[Childs]

http://support.apple.com/kb/sp583

The CPU upgrade was a BTO option.

 

[TheStu]

Yea, easiest way to sell it is to just mark it as a Mid-2010 MBP13, list the specs, and call it a day.