Dual-Tower heatsink designs are very impressive- both when it comes to size and performance. It’s another part of the story that (depending on the CPU Cooler manufacturer, the motherboard manufacturer and memory kit manufacturer) may make it in a way that something may come in the way. I am not a real believer that tall memory heatspreaders have real value when it comes to heat dissipation. Depending on the design, they do look at. And also it helps to cover the chips used in the kits. Alas, we don’t have a proper equipment to evaluate that… yet!!