Not listed as either supported by that motherboard or something that Intel makes?
Perhaps the QX9770 or QX9775? Still not supported, but those do exist. My guess would be the motherboard is only rated at 95W and the extreme parts exceed that, by a lot.
Fastest chip listed as supported is Q9650.
Honestly, probably easier to just go up a few generations and pick up a used i7 that will outperform these.