Case fans at half speed:Let's start of with the easiest of manipulations: reducing the speed of the two case fans should silence the system a bit, without losing too much cooling power.
Each fan's rotation speed was cut in half using the Aerogate II fan controller:
(number between () is compared to default configuration)Noise measurement:
37.1dBA (-2)
CPU:
56 (-1)System:
38 (+4)PWM:
47 (+1)HDD:
36 (+7)RAM:
39 (+1)VGA:
59.5 (+2)Top:
34.5 (+1.5)Bottom:
35 (+4)Reducing the airflow inside you can see some changes; the hard drive benefits most from the front fan, without it the temperature rises 7°C , the other components only become a few degrees warmer. CPU actually becomes 1°C cooler, this is within the margin of error though, and it's quite possible that the two case fans were disrupting the airflow towards the CPU's fan.
Case fans at zero speed:Now let's see how the system does without any case fans running:
(number between () is compared to default configuration)Noise measurement:
36.8dBA (-2.3)
CPU:
57 (0)System:
41 (+7)PWM:
47 (+1)HDD:
38 (+9)RAM:
40.1 (+2.1)VGA:
61.5 (+4)Top:
36.5 (+3.5)Bottom:
38 (+7)The noise doesn't decrease a lot when compared to the system running with the case fans running at half speed. The temperatures however increase quite a bit, closing in on +10°C for the HDD.
Conclusion: a fan controller should be near the top of your purchase listCost of the modification: $15-$70 depending on your needs.
Adding a fan controller can help reduce the noise generated the system's case fans effectively without affecting temperature a lot. Even a little bit of airflow proves to be much better then none at all. You can go all out and buy a fan controller with all the bells and whistles (memory card readers, LCD display, and allow control through software in Windows) or stick with a more modest model which features a series of knobs which control the fan's speed.
Do it Yourself solutions :
Make your own FanBus: allows you to select 12/7/5v for your fans
Build A Pulse-Width-Modulation Fan Controller: advanced guide on building a PWM fan controller much like T-Balancer XL
Fan Controller with rheobus
Good review, Good subject