Do you have a Tbred (266) or a Barton (333)? If you just bought a "XP2600" odds are they sold you a TBred.  To check grab something like CPUz ( http://www.cpuid.com) and check under the codename box
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ASUS P5K Premium WiFi-AP, Q6600@3.7 / ASUS P5ND, E6400@3.8
4GB OCz Platinum XTC 8500 / 4GB CorsairXMS2 6400
5x500GB Seagate 7200.10 / 2x500 Seagate 7200.10
OCz 8800GTX 768MB @ 630/800 / 2x Galaxy 8800GT SLI
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