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Originally Posted by Uncle`BuZZ
the ranking depends of the waterblock in loop... In particular, if you watch the results of laing DDC, you can see his rank is different for the MCW6000 where it is worse than EHEIM 1250 (as your ranking) but for the nexxos XP, it's best than EHEIM1250 and Laing D4 (MCP650), even if figures are for 8w instead of 11w.
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Indeed, ranking is highly dependent upon a number of factors:
1) Block in the loop (flat performance curve blocks, and/or highly restrictive blocks favor higher head pumps, while low resistance blocks favor higher flow pumps)
2) Radiator heat dissipation capacity (highly performing radiator will favor stronger pumps, weak radiators will favor lower heat dump pumps)
3) CPU heat load (lower heat loads favor smaller pumps)
4) CPU die size (affects what the block does)
5) Optionally GPU heat load - a hot secondary GPU with waterblock will tend to tilt favor towards stronger pumps too as the total CPU + GPU heat-load is more significant than the pump heat.
The rankings presenting in this thread are purely the result of a theoretical exercise. I chose the Cascade to work around mostly because it's a bit of a middle-ground sort of block. It's neither high restriction nor low restriction, and it possesses neither an extraordinarily flat C/W curve, nor an extraordinarily steep curve.
By all means, do not take these results as gospel. The results are highly setup dependent. This is more meant to be a rough guide to:
1) Seperate out the clearly weak pumps (Eheim 1046 for example) from the apparantly exceptionally balanced pumps.
2) Hopefully cause people to take pause before clicking "buy" on some 100W pump thinking that it'll improve their temps.
There are plenty of limitations to what's being presented above. Nobody should be thinking this is a one-size-fits-all sort of thing.