^ This is correct. 1.5v DDR3 does not need heatspreaders at all. It's just for marketing and looks. Personally I don't think Corsair should have made the high profile Vengance at all. Too many people had issues with it not fitting with their aftermarket coolers. The low profile stuff is fine. Same exact RAM just made more user friendly.
If you just want heatspreaders for looks go with GSkill Ripjaws X. It will fit under an aftemarket cooler. It's as good as the Corsair as well.