Nvidia GTX 690 --> Dual Quadro K 5000 / Tesla K10

Zitat

There are two tiny SMD resistors on the board, one for each nibble of the PCI Device ID byte. Originally the GTX 690 has a device id of 0x1188, so to become a Quadro K5000 this has to be changed to 0x11BA, which equates to 20K and 15K resistors. If you wanted to change it to a Tesla K10, you would want to change it to 0x118F, which equates to 5K and 40K resistors.

This will only change the rear GPU on the GTX 690, I am yet to identify the resistors to change for the front one. I would also wager a bet that the new NVidia Titan can be upgraded into the Tesla K20 using the same method.