Removing the stock cooler will depend on which type of GTX680 you have. Both our GTX680's were of reference design. Due to the design of the waterblock, we cannot say whether the block would fit a non-reference design but it is unlikely due to the cut-outs for capacitors in the acrylic.
With the coolers removed, we cleaned the residue from the memory chips, VRM and thermal paste from the core. We then added the thermal pads which were none sticky. The last job before attaching the block was to apply a fresh blob of included XSPC thermal paste to the core.
Fitting the block was a cinch thanks to the well diagrammed instruction pamphlet. Reference cards will require 10 screws, while custom cooled cards will require 9.
While it is important to get good contact of the block to the graphics card, it is important that the screws are turned carefully without too much pressure to prevent bowing the PCB. To check this lay the card on its side and check the profile. There will inevitably be some very slight bowing in places but as long as the card doesn't resemble a banana it should be fine.
With the waterblocks fitted it was time to connect these together. We decide to use the 4 port Flow Bridge for our setup however you may wish to choose the 2 or 6 port depending on your requirements and motherboard PCIE layout.
The bridge is a hollowing out length of acetel with four screw holes at each end. A rubber o-ring at each end of the flow bridge will prevent water leakeage and should be checked and double checked it is in place, not kinked and fitted correctly before attaching the flow bridge to the multi adaptor on the main waterblock.
The flow bridges fitted perfectly to the blocks using the provided screws.
When fitted, the flow bridge will look something like the above depending on the size used. You should then start filling the spare holes with the black chrome plugs, leaving one on each card free to attach you water loop connections be it compressions or barbs.
The finished article. Truly a thing of beauty for us watercooling enthusiasts!