I've returned two to Intel. Usually the tech will ask if you have swapped out the cpu with a good one. He'll look up the serial # of both (so don't try to snow them). He'll use the production date for the warrenty time start if you don't have a receipt from the store. Then he'll give you an RMA # and address.
The boxed ones have a serial number on top so you have to wipe off the paste or it gets all over when you examine the chip. Both that I sent in, I didn't include the fan.
They didn't have any PIII 750 so they upgraded me to PIII 1000

with a new fan. They did mention that only the original warrenty was still in place. It didn't start over with the replacement.
You might suggest to AMD that you are more than satisfied with Intels return policy.
Hope this helps
As a footnote, It it isn't boxed, it only has a 90 day warrenty. OEM=90 days!
