When I had my 1250 I did qute some flow tests, and I came to conclusion that this pump is not to efficient in water cooling setup. I had rig with my block, 1m of 1/2 silicon hosing and a heatercore, I measured flow for this setup and it was ~370 l/h , so way bellow rated 1200. And now I'm using two maxy-jets 1000 l/h pumps in series for double preasure output and my flow is now above 500 l/h and both pumps still put out less heat then one Eheim 1250, plus they are much smaller. The most important data you need to look at is preasure output not so much the flow rate.
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