Yeah if you have large heatsinks on your RAM modules you may run into issues with the NH-D14. Best thing to do is try and google to see if anyone owns that board and heatsink, try to find pictures and see how far it stretches of the RAM slots. The fan closest to the ram slots can be risen up to help clear ram modules.
On a side note if you want to play it safe or end up finding out you can't use the NH-D14 I can recommend the thermalright Archon or the Venomous X as other options.
EDIT = Just did a quick google image search and looks like the first ram slot will diffidently be taken out by the heatsink itself, but the second one might be clear if you raise the fan, depends on the height of those RAM heatsinks.