OCC has published a review on the Cooler Master HAF X
A quote from the article:
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Cooler Master also did a very good job with the new additions and in my opinion, one of the best is the new hot swap bays. These new bays allow for easy installation of two SSDs or HDDs thought the front bezel. When connected, the drives are actually attached directly to the motherboard via the circuit board, so there is no reduction in performance when using your hard drive via the bays.
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