I would list your question in a gateway forum, if you can find one, and see if anyone has been able to use a quad or e8400 with your board. Doubt if gateway will answer your question, but it won't hurt to try. The q6600 is the only quad I would try with your board. L2 cache doesn't matter; wolfdale cpus are the newer .45 nm, which I believe the e5200 is. You see the main problem with oem boards; no support for cpu upgrades.