Does it have room for 3 boards, or is it perhaps an S7-LN?
It looks like a 3rd board is missing in the middle. It was suppose to be an LN but it screams (loud!) like a standard S7.
The LN only has 2 boards with a bit taller heatsinks than standard s7. Still have it OC'd to 750MHz? If so that is why so loud...