Please note: Apple created a more robust thermal specification for the mac pro FB-DIMM heat sinks that provide more efficient cooling than many other FB-DIMMs. These FB-DIMMs require less airflow to stay cool and allow the internal fans to spin at slower speeds, improving system acoustics. FB-DIMMs made by other manufacturers that do not include a sufficient heat sink may cause the fans to run faster (and louder) or the memory chips to run slower so as not to overheat. Is this true regarding the FB-DIMMs Apple creates compared to other manufacturers? Has anyone tested the two?