3D Game Man posted a review on the Crucial Ballistix PC2-6400 Memory

During testing, the memory modules never had a hiccup. MemTest, Sandra, ScienceMark and others could not make this memory skip a beat. It ran rock solid during all tests and even never really ran hot to the touch. The Ballistix line of memory runs very cool compared to others that require large and elaborate heat sinks. Even with a mild over clock and voltage push, these modules laughed at the idea of failure.

Crucial Ballistix PC2-6400 Memory Review