Celeron 430 is based on the core2 duo architecture, but is a single core version with less cache. I would return the cpu, and order a 21xx online at newegg. Get the retail boxed version of the cpu for the 3 year warranty. It costs just a few dollars more. Then you can deal with Intel if you need a warranty claim. I sent in a p4 awhile back, and it took just 6 days to get a replacement from Intel.