My system uses DDR2 dual channel memory. I recently upgraded from a 32 bit operating system to a 64 bit os, and went from 4 gigs to 8 gigs. I was using Infineon and Hynix initially. I bought 2x4 gb of Kingston memory w/heat spreaders. My system does not seem noticeably faster. Everything loads up about the same. I do notice that video and audio don't quite match. What gives? Memory increases in the past (much smaller) couldn't be denied. NOT this time. What is up? Any ideas? Thank you.