I am currently running a AMD Phenom x4 965 on aGigabyte AM 2+ board using 4gb of DDR2. I want to make some upgrades and wanted to know how big of a performance jump will I get going with DDR3. My other upgrade option was to run two WD 640gbs in Raid 0 and short stroke them but I wanted to know if the money is better spent on the ram instead.