Here is an unsupported method up updating the cpu birth date table.
Here are the 3 main steps summarized:
1) extract the data from v_GS_PROCESSOR
2) add extracted data from above step to table LU_CPU
3) add missing manufacture date (you can get from manufacture website or other sources) to table LU_CPU field CPU_Birth and that's it.
for detailed step by step instructions and diagrams:
http://systemcenter-noob.blogspot.com/2012/07/modifying-configmgr-report-hardware-02a.html