The desktop CPUs are more powerful, which makes sense considering they're clocked considerably higher and using the same technology. However, you can't swap a notebook CPU for a desktop CPU or vice versa on any system. If you've got one of the Sagers that uses a desktop chipset, then you can only use desktop CPUs in it. If you have one that uses a mobile chipset, then you can only use mobile CPUs. You can't mix and match between desktop and mobile processors.