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It sounds highly likely that you need a BIOS update to make the computer recognise the new CPU by name/model.
Check the Dell website support area for instructions on downloading on updating your BIOS.
I did a BIOS update and get the same messaage. I'm thinking that the error is caused by not having the processor ID embedded in the chip. My question is why does the Intel Processor Identification tool returns "Unknown Intel Processor".
Go to device manager - processor - right click on unknown device and click UNINSTALL DRIVER and restart. It will work
I think you misunderstood the problem. The Intel Processor ID utility reports an unknown processor not the device manager. BIOS apparantly cannot find the processor ID because it is an OEM part. My question is why the processor ID was not included in the device.