Cold Reboot Attacks on Disk Encryption

Or, alternatively, in some other device: perhaps the graphics chip.  On any given system
there's some bit of complicated hardware that is not used.  On many systems the 3D features
are never used (e.g. Nvidia chip w/ nv driver).   Others have firewire, or an MMC slot.  For
security, it could be an advantage that the key is stored at different addresses on different
machines, particularly if random values are stored in the others, and the actual location used
on any given boot is chosen from among them at random.