It seems when I reviewed the original H20-320 Edge water cooling kit from Swiftech, a lot of people didn't see the benefit of buying a water cooling loop that will limit leak points by combining major components all into one system. By that, Swiftech took the radiator and topped it with a small reservoir, and then, they attached a MCP35X pump right to it. With this arrangement Swiftech eliminated four points of potential leaks, and this also simplifies the tubing as it passes through your case.
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Source:
tweaktown