I have the 7000 (with the 92 mm fan) and it fits just fine; I can even still remove the power connections and memory while it is in place. I don't know about the 7700, though (with the 120 mm fan), but I do know that there is still room with the 7000.
If you want to check compatibility, one way to check is to get a top-view image of the motherboard, convert the size of the heatsink to a size in pixels (relative to the size of the image, then draw a circle that size using an image editor, then see if it covers anything. I did that before buying, and found that the 7000 was able to fit just right without even going over anything. As for overlap, that's more difficult to figure out.