I am deciding between the AMD x2 560 and amd x4 955. I read the reviews on newegg for the dual core, and they all said "unlocked to quad core, yay!" What are my chances on having the extra two cores? Also, how much can the 560 as x2 be pushed as far as overclocking goes? The 955 can go max 4ghz on air, but the x2 unlocked to quad has been oc'ed to 4ghz on air.