Knowing the dimensions won't really do us too much as we'll need to know the exact case you have in order to give a better example. The dimensions may fit the case but you may not be able to mount it in with the screws or cable management might be a true hassle if the sides of the case offer almost no room for the thick PSU cables. Alternatively it could be blocking your USB connector(s) on your motherboard, fan headers and worse case scenario blocking or touching your GPU(s) if you have SLI/Crossfire or if the motherboard is just naturally closer to the PSU (I imagine a mini-ITX motherboard would be the only scenario to fit this but just to be on the safe side.) I would recommend listing your case you have now or plan to get and what type of PSU you are planning to get. Motherboard would help but case and PSU are the more important information.