Alphacool NVXP-G8 waterblock
You can see from the graph below that there is quite a considerable pressure drop for both GPU blocks. However, the Alphacool NVXP-G8 takes first place over the EK FC8800GTS, simply because it facilitates the least amount of 'head' loss.
The Alphacool NVXP-G8 proved to be the most restrictive block of the two tested, with the EK FC8800GTS allowing 100 litres/ hour of flow more than the Alphacool. It will be interesting to see how much of an effect the reduced flow has on the actual cooling performance of the water block. The graphs at the bottom of the page best reflect this.
I was quite impressed with the cooling performance of the Alphacool NVXP-G8. However, the EK FC8800GTS managed to provide a slightly better overall cooling capacity at load, and when overclocked.
My ASUS EN8800GTS graphics card is not a bad overclocker, and both water blocks managed to get the core clock up to 663Mhz from the default of 513Mhz. Which is an increase in core clock of around 29%. Overclocking the memory on the card proved a little better too with the Alphacool NVXP-G8 managing to get the memory to 983Mhz, and the EK FC8800GTS to 1020Mhz, respectively.
Ambient Temperature - 24.3 degC
|30.8 DegC||31.4 DegC||32.9 DegC|
Ambient Temperature - 24.6 DegC
|31.4 DegC||32.3 DegC||33.5 DegC|
All things considered the Alphacool NVXP-G8 provides solid cooling performance. Let's head over the page to see how it performed as a whole...