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Originally Posted by Cathar
Flow rates of 0.75-1LPM eh?
Doesn't that then get into the intent of a design? The impingement designs totally rely on adequate pumping pressure to get their cooling performance.
A large number (almost all?) of the "USA" designs, mine included, are totally inadequate to cope with those sorts of flow rates. Crap, I don't even test at anything below about 2LPM, and even then such a result is just a curiosity for me as that sort of flow rate is already well outside of my targetted flow rate range, upcoming designs included. That the blocks that I make with ~1mm bases perform anywhere near as well as they do at such levels is perhaps somewhat of a total surprise to me.
Getting back to a car analogy, this is perhaps somewhat equivalent to running said Ferrari on diesoleum.
This becomes more of an issue of the focus of the testbed. A good testbed will test blocks across a range of flow rates, especially including those for which the blocks were designed to operate at.
I am now left with no wonder as to why no one understands what the sorts of performance differences between the US vs German types of blocks are. At 1LPM at 100W though, and I have almost no fear in stating that the USA blocks when run at their intended flow rates will take the lead.
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I think you are right that "USA" style blocks will start beating out the low-flowers at higher flow rates. But thats because most US blocks now use two things that I think you basically invented: put the water-in nozzle over the core, and create impingement by breaking up the waterflow as it enters the block, as it comes in contact with the core. Strange thing, just about nobody puts the nozzles on the corners of blocks anymore. Wonder why?
You need high power pumps to do that effectively. What gets me is now you see some really well made and designed iterations of that philosophy in German blocks like the NexXxos 3 from Alphacool.de, yet they persist in using 8mm tubing. I wonder how well that block would perform with 1/2" tubing? To again return to the car analogy, its like putting a 2-barrel carb on a 7 liter dragster motor: for either subject, you need to "feed the beast!"