OCIA.net takes a look at the Arctic Cooling Accelero S1 in their latest review

The installation of the voltage regulator sink and the RAM-sinks was pretty simple: just peel and stick (and screw, with the voltage regulator) or so I thought. Turns out that, unlike its cousin the Accelero X2 (where the RAM-sinks are said not to come off), these ones didn't stay on! After lots of futzing and frustration, I decided to plop my hard-covered A Friendly Introduction to Number Theory, by Joseph Silverman, on the card, compressing the RAM-sinks. On top of that, I put two high-school yearbooks. Twenty minutes did the trick, and I moved on to the real deal.

Arctic Cooling Accelero S1 Review