get a new rig, unless you buyin the cpu used for a good deal, 775 iz dead, but if you must choose, id recommend q9xxx, but if the above are ur only choices, go q8, since it is made with 45nm, whereas q6 is 65nm, but id ore suggest u try to get ur hands on a used q6, shudb pretty cheap, why does that board not have a support list?