The Elite has big black heatspreaders guess it out be the top of the line, the Sport bottom rung, Tracer or Smart Tracer i believe the older 1.65v stuff. and the Tactical Tracer is the the new 1.5v with the leds. Smart Tracer has leds also. I have 4x4gb of the 1600 Tactical Tracer running 2000mhz@1.65v timing is 9-9-9-27-2T but i am still working on that. But i am running a Amd 1100t and I dont feel my imc is all that strong. I think most of the new 1.5v stuff overclocks about the same, with the exception of the Sport. But I have only tested my current 4 sticks. Hope this helps, Adam