Alphacool NexXxos X2 Bold Highflow water block
Published: 2nd November 2007 | Source: Alphacool | Price: |Testing
Determining pressure drop for water-cooling components is really quite easy and should give the prospective purchaser some idea of how well or how badly a particular component restricts/resists the natural flow of a pump. This is especially important when designing your water-cooling loop to ensure that your pump flow doesn't come to a crawl because of your cpu block, gpu block and possibly chipset block. Factor into the equation a reservoir, various curves and connectors and the amount of pressure drop can become an issue. Hence the reason why we need to assess for pressure drop.
You can see from the above graph that both the Alphacool X2 NexXxos and the XSPC X2O Delta recorded the same amount of pressure drop The reson why this has been recorded as such is simply because my current flow meter measures down in increments of 1 kPa. Both of the waterblocks actually recorded pressure drop less than 1 kPa, but in order to measure it accurately would require the use of a digital pressure gauge which exceeds my budget at the moment. The pressure drop experienced by the Alphacool X2 Bold Highflow would most certainly be attributed to the 'accelerator nozzles' in the inlet. The X2O Delta on the other hand simply dumps the coolant into the waterblock, which it then has to fight its way through all those densely packed copper pins on the way to the outlet. The end result is a loss in pressure.
The graph below further illustrates how the Alphacool X2 Bold HIGHFLOW waterblock's accelerator nozzles hinder flow. With the Laing DDC Pro with OCLabs top pumping out nearly 800 Litres of water an hour at 12v, the significant significant drop in flow can only be attributed again to the accelerator nozzles. Remembering back to basic science class we know that water will always try to follow the path of least resistance, but when you're forced through 53 small holes your flow rate is going to hurt.
The XSPC X2O Delta doesn't get away that easily either. The X2O Delta's densely packed copper pins have a detrimental effect. The end result is a loss in flow.
Simulated Water-cooling loop
Let's see how the Alphacool NexXxos X2 Bold HIGHFLOW handled the increased heat-load of a quad-core...
Water Temp @ Idle - 33.8 Deg C
Water Temp @ Load - 34.3 Deg C
Water Temp @ OC - 38.1 Deg C
The Alphacool NexXxos X2 Bold HIGHFLOW handled the heat from the Intel Q6600 very well; considerably better than I had anticipated.
Now let's head over the page to see how the XSPC X2O Delta handles the heat...