Cross-validate CPU-Z results with HWinfo64,
link:
https://www.hwinfo.com/download/
Since what CPU-Z shows, is both inaccurate and missing info. E.g it is unable to detect CPU model and if you truly have Q9450, it's frequency spec must be 2.67 Ghz and not 2.00 Ghz. Also, there are some missing instructions.
Oh, is your CPU-Z running in Administrator mode?
Overall, No.
When you can boot to OS, CPU itself is working fine. Though, i've seen instances where hardware (CPU, GPU, SSD etc) doesn't display accurate info and this is to do with fake hardware. It is usually done with GPUs. E.g software says RTX 3080 but in reality, the chip is RTX 3050. CPU faking is more rare, since it's harder to do. And for your chip from 2008, i find it hard to believe that the chip is faked to Q9450 while being Q8200/Q8300 or so.