Intel Core 2 Extreme QX9770: UPDATE
 

If you buy a Core 2 Extreme QX9700, you should be able to run it in an X38-based board, which is, incidentally, exactly what Intel suggested we do to test this processor in the first place. However, if things do go wrong and the CPU or board are damaged, things may turn sour for you. Intel would most likely waive any warranty claims on the grounds that the chipset was being used outside of its specifications.

http://www.tomshardware.com/2007/11/...xtreme_qx9770/