I'm using a modified FOP32 (trimmed to fit past the caps) on my northbridge. YS-TECH 60x60x25 fan @ 5V on it, VERY quiet, cools nicely. You won't get anything that'll take more than about a 60mm fan on most northbridges due to the caps sadly. It could possibly run passive but as the fins run horizontally I like a bit of airflow to stop them trapping hot air.
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