got a old hp pavilion a6742p, 2008. its got a Intel E5300 (dual core, 2.4ghz, hoping to upgrade to a better cpu as well, some input from you guys on a better cpu would be great), 6gb ram, 500gb hdd, and the graphics card, uses the GMA 3100. what graphics card can I use that's the best for this? hp says it can use a PCIx16