This happened to me on a Compaq Presario HR2168HM. I upgraded from a Sempron processor to an Athlon X2 be2400, post and BIOS both report Unknown Processor model CPUz identifies the processor properly just like yours with the exception of the Processor Specification. I updated the BIOS to the latest and greatest, yet this did not correct the Processor ID in BIOS or The error in CPUz, however that is the only problem and the processor operates as it is designed to otherwise.
The mobo model and everything is in one of the pics, it is not a dell it is a custom built comp. And it is not working how it should..CPUz is saying it's clocking 800mhz when it should be clocking 3.4ghz.
When you install an unsupported cpu, it might work and it might not. I have one system here running a 6400+ on a biostar board [not listed as supported] it works fine however if it did not, I would not be upset.
In short when you install something that is not supported, you are in effect a beta tester.
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