Using thin heat sinks will cause the following issues. High temperature in Mac Pro chasis and your system fan will run very fast constantly to cool down the system. Mac pro fan is very noisy while running at full speed. High temperature will damage your system and memory within 6 months.
Apple original DDR2 FBD DIMMs for Mac pro always come with thick heat sinks as shown in our picture. Thin heat sinks were never used by Apple to avoid thermal issues.
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