Was talking to a friend today bout the ps3 and he came up with this. its just a idea so here it goes.Sponsored Links
Take apart the SDK model, take high resolution photos of the Logicboard. Work out what all the IC,s are.. Its possible that sony has put a extra IC on the SDK models, that retail consoles dont have. which the firmware that the SDK models run checks for. It may be simple to solder a chips to the retail console.
Hope i can get some light on this..