I have a HP Pavillion dv6833 laptop. The motherboard model number is 460901-001. I changed the OS from Vista to Windows 7 (64 bit). The 64 bit system requirements says it iwll work with 2 GB ram but i have 3 and it froze a few times. I checked and all the 64 bit systems come with 4GB of ram at least. I have 3GB of DDR2 667 (pc5300) and I want to upgrade to DDR2 800 (pc 6400). Both are 200 pin. Would i have a problem? Do i have to stay with the DDR2 667 (pc5300)?