If you open a MacBook Pro, most owners will find memory modules from Kingston. On its website, you can use their RAM module search tool to find the right modules for your Mac. However, two references are described with no real compatibility with currently available Mac: KTA-MB1333/4G and KTA-MB1333/2G. Those are units for MacBook and MacBook Pro, of respectively 4 GB and 2 GB, for a bus clocked at 1333 MHz. Using such modules would not bring any advantages to the current MacBook/MacBook Pro models, with bus limited to 1066 MHz. So, we could offer several hypothesis:
