I've got a Gigabyte 81845GVM-RZ mobo with a 256 MB Hynix DDR266. I just bought a Kingston 512MB DDR333 module (because it costs the same as the 256MB). Which one should I insert into the first or slot 0 to obtain the best performance and/or stability ? I guess I will be getting only a 266MHZ speed but my ram will increase to 768 MB ?