Nexus HXR-5500 Memory Heat pipe Cooler. A long name for such a simple product. But it's simplicity also makes it cheaper and I like the look of it as well. Again Nexus used Heat pipes to help cool down in this case the memory. The HXR-5500 is basically a large platter of aluminum stuck to the side of your memory along with a heat pipe to cool it more efficiently and therefore give it more over clocking capabilities.