Overheating can happen if you have close slots and 3rd party cooler design, I have to have my stock design on top because the vapor-x is thicker and blocks the vents. Just make sure that the slot you are putting it into is x8-16 and not limited to x1 or x4
CF doesn't work if the program is windowed (has to be true full screen, not boarderless window either) so that's why only one GPU was being utilised.
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