SilenX iXtrema Pro IXP-76-14/18
The next two fan models also come from SilenX and have a lot of similarities with the two fans we have just discussed. However, they are of different size and measure 120x120x38 mm. The design of the fans package and the bundled accessories are exactly the same as those of iXtrema Pro 25 mm fans:
Moreover, the fans themselves look very similar to the other two, except for the depth, if course:
Seven powerful blades are attached to a rotor 41 mm in diameter. Four supporting rods are a little thicker here, because the blades load is higher. Nevertheless, 38 mm iXtrema Pro fans weigh about the same as the 25 mm models: they are unusually light. The inside of the fan frame is very smooth, the gap between the blade tip and the frame is 2 mm, i.e. the same as by the two fans discussed above:
These two fans rotate with different speeds. The models with IXP-76-14 index should work at 1200 RPM, while the IXP-76-18 models – at 1400 RPM. They also create different airflow: 72 and 90 CFM respectively. Again, there is no mention of the static pressure readings, but the noise declared readings are right there in the open: SilenX fans are claimed to generate very little noise: 14 and 18 dBA respectively.
I use the word “should” here on purpose, because the real state of things is a little different and we are going to talk more about it in a little bit. 38 mm IXP-76-14 and IXP-76-18 fans use the same bearing type as their 25 mm brothers. We don’t know how long they will last, because the manufacturer doesn’t mention the bearings MTBF.
As for the fans power consumption, I have to add that the model with 1200 RPM passport rotation speed should consume no more than 2.4 W at 0.2 A current, while the 1400 RPM model will need 2.88 W at 0.24 A current.
Let’s see how much closer to life and more efficient the actual readings taken off the 38 mm iXtrema Pro fan models will turn out compared with the 25 mm ones:
True, bigger fans create greater airflow than 25 mm fans; however, it is accompanied with higher noise level. So, if we level out the noise level of both models, then the airflow from IXP-76 and IXP-74 will be the same (you will see it at the summary diagrams later on). The mess with rotation speeds is also present here, though not so often anymore and we did manage to get the readings off the device, so there was no need for interpolation. IXP-76 can be considered acoustically comfortable at 810-840 RPM. In terms of power consumption, 38 mm SilenX fans require more, which is actually quite logical. The fans start at 2.7 and 2.4 V respectively.