because my DP45SG board does not want to recognize my intel core 2 extreme QX9650 :(

[AlHill]

Did it ever recognize this processor, or are you doing an upgrade?

What bios revision do you have?

You need at least bios 73:

https://www.intel.com/content/dam/support/us/en/documents/boardsandkits/desktop-boards/DP45SG.pdf

Doc