Cooling Efficiency Tests
The diagram below shows the obtained results of our cooling efficiency tests:
Deep Cool V4000 is obviously better than the reference cooler of our Radeon HD 5770. However, I am sure this is exactly what everyone expected from this product, which is small but is made of solid copper. In quiet mode when the fans rotate at 1130 RPM, the Deep Cool cooler is 9°C better than the reference cooler at 2000 RPM fan speed in nominal mode and 5°C better in overclocked mode. When the two 80-mm fans of our today’s hero rotate at their medium speed (which is still very quiet), the GPU temperature dropped by another 5°C in nominal mode and by 6°C in overclocked mode. And at maximum fan rotation speed the cooler efficiency improves in about the same proportion. I also have to say that the reference Radeon HD 5770 cooler at maximum speed of 4200 RPM is just as good, so it makes a lot of sense to move over to acoustic measurements at this point. However, before we do that, there is one more thing I wanted to draw your attention to.
We absolutely had to check out the cooler efficiency in passive (i.e. fanless) mode and I have to say that it did great. Even though it managed to maintain the maximum GPU temperature below 86°C only in nominal mode and only during 15 runs of 3DMark 2006, we still think it is a very good result for a small cooler like that.
The results of our noise tests performed on the reference ATI Radeon HD 5770 and Deep Cool V4000 coolers are presented on the following diagram:
Deep Cool V4000 is obviously quieter than the reference Radeon HD 5770 cooler, as you can clearly see from the diagram. However, I have to add that the fan of the reference ATOI Radeon cooler generates some unpleasant noise even at its minimum speed, while the noise from Deep Cool V4000 fans practically disappears once you get below 1550 RPM, so that it becomes if not completely noiseless, but at least extremely quiet. Deep Cool cooler is acoustically comfortable up to 1800-1850 RPM and fits perfectly with the quiet system case concept.
Deep Cool V4000 has only one drawback: it lacks a rotation speed variator or at least 5 or 7 V power adapters that could lower the rotation speed of its 80 mm fans. The cooler is efficient enough to cope with an overclocked Radeon HD 5770 even in FurMark, so these fans do not really need the high rotation speed of 2800 RPM. These fans generate considerably less noise at average and minimum speed than they would at the maximum rotation speed. Other than that I can conclude that Deep Cool V4000 is an ideal solution for compact graphics cards like Radeon HD 5770/HD 5750. And this is not because we don’t know of any other alternatives for entry-level Radeon graphics cards, but because Deep Cool product is significantly quieter and much more efficient than the reference HD 5770 cooler. Moreover, it can even be used in passive (fanless) mode. I doubt you can wish for anything else at the price of $25. What do you think?