I am needing some 168-pin SDRAM I need a total of 512MB that is the maximum my computer can handle which powerleap.com told me. I am needing 512MB of RAM so my computer can run Windows Vista I tried to install it and it would not allow me to it says setup has detected you have 256MB of RAM you need 512MB of RAM to install Windows Vista setup is now exiting. I am needing this RAM for cheap as possible.