All card have diff. sensitivites(for lack of a better word!). A GeForce MX chipset doesn't give us any clue to the OCCing capabilties. A card built by Asus or MSI would go higher than say a S-Media. The only way to find a safe limit is to OC by small increments, say 5-10 mhz. OC both the core and memory in equal increments. Then run the most graphics intensive program u have for atleast an hour or two. If there's no graphical corruption/BSOD, go higher. Also if u have a HS/fan over the chipset, u can go higher(most GF 4 MX have just a HS). Just bear in mind that OCcing will void all guaranties/warranties and will also lessen the life of ur card. Happy experimenting!!