My PC specs: AMD Athlon 2600+ TT VOLCANO 9 C.M. + 2 case fans, both blowing air in the case
(Epox 8RDA Radeon 9700 pro RAM Twinmos 2x 256mb PC2700 HDD 120g 7200 ATA100)-> unnecessary data i guess
Cpu temp 46-52C;system 33C when my fan works on 4400RPM. With that speed my fan makes lots of noise. So i started to look for "silent fan". TT Silent Boost has to offer everything I need(21dB instead of 45dB). When i read the detail specifications of the fan i have realized that the silent boost fan has the same air flow as my volcano 9 and running on lower RPM(only 2450)! So i droped my volcano 9 to 2500RPM and my temp started to rise from 46 to 55c. Now my question for you experts is: If i buy the silent boost won't my temp rise above the normal level becouse of the low RPM? Is really the silent boost the best noiseless solution? Is my cpu running on normal temp just becouse my RPM are high or is this simply normal?!?!
Airflow matters. RPM is only a means to an end - getting the airflow.
Fans can be designed in different ways to produce different tradeoffs between cost, noise and airflow.
However, the usual way to get the same airflow at lower noise is to make the fan bigger and run it at lower rpm. Generally speaking two fans of the same size running at the same rpm will have similar airflow, though the better fan may be quieter.
If the TT silent boost is the same size as your current fan but runs at 2450 instead of 4400 rpm, then I simply don't believe it will give the same airflow, and you CPU will get hot.
But if it's a bigger fan with a funnel or adapter so it still fits you heatsink, that's a different story. I fit 92mm fans running around 2400rpm to all my machines. I have to build funnels to fit the heatsink but it works like a charm - cool and quiet.