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Replaced the HSF in the Iceberg with an AeroCool Deep Impact DP101 today...
I was expecting to see a considerable decrease in the CPU temperature (which was running at ~51°C) with the DP101. Interestingly however, I actually saw a small increase to ~54°C! But there was another effect to observe: the CPU fan speed of the new HSF was ~3000RPMs slower than its predecessor - so the heatsink is obviously a performer, despite my initial disappointment.
I'll post a more detailed review shortly.