The Connections

3-pin to 4-pin Molex Convertor

The fans come pre-equipped with 3-pin to 4-pin Molex converters. With this converter, you don't have to rely on the limited number of fan headers on your motherboard. Also, as many of you already know, drawing power directly from the PSU gives you more juice than the motherboard's fan headers can, resulting in a faster spinning fan!

However, there's one thing missing from the 3-pin to 4-pin Molex converter - a RPM monitoring line, one that can be attached to the motherboard's fan header. This would be very useful for those who want to power fan directly AND also monitor the fan's RPM. This missing feature does detract a little from the value of the Molex converter. Hopefully, Bitspower will include it in their Molex converters in the future.

Thermal Control

Heat me up and I'll give you more juice!

Bitspower uses a simple heat sensitive resistor as the fans' thermal control solution. The principle of this technique is really very simple. As the temperature rises, the resistor heats up, causing its resistance to drop. This allows more electrons to flow to the fan, thus allowing it spin faster. And when the temperature drops, the resistor's resistance automatically increases, reducing the current flow to the fan. It's simple as that!

While this feature helps to reduce the noise level and save some electicity, I would prefer the heat sensitive resistor to be detachable from the fan. Not everyone likes to have their fan speed controlled by the temperature. I'm one of them. [Ed. : So am I!] Although it's rather easy to mod the fan to remove the resistor or make it detachable, it would still be nice to see Bitspower providing the resistor as a detachable feature.

Okay, we have basically covered the common features of the Bitspower fans. Now, let's get into the details of each of them!