The Q6600 only comes out as two models, sSpec SL9UM (B3 stepping) and SLACR (G0 stepping-by far the better of the two) and both are standard Intel CPU's. The heatsink and motherboard are probably proprietry to Dell, but the CPU certainly isn't. The sSpec will be marked on the heatspreader along with the FPO/Batch code which tells you about it's manufacture-you can decipher that using this:
1st digit/letter is the plant code : 0 or 3 for Costa Rica, 1, 7 or R for Philippines, 6 for Arizona, 8 or Y for Ireland, 9, L or Q for Malaysia
2nd digit is year of production (i.e. 7 = 2007)
3rd and 4th digit is calender week of the year
Digits 5-8 is the lot number
Last four digits are the serialization code
And that's probably more info than you ever wanted to know...be sure to drop the newfound knowledge at lunch on Monday!