360 fan control

Sareth · 12 Apr 2007 at 17:58

Does anyone know anything about the thermal control for the 360 fans ?

Mine seem to be running at two different speeds and was wondering wether
they are independently controlled or not ?

I looked up the motherboard connectors and each one has a separate power supply but cant find anything more.

This is all I could find...

Xbox.com: Won't two fans make an awful racket while I'm trying to play games or chat or watch a movie?

JR: Actually, we tried to balance the console form factor, thermal performance, acoustic performance and cost of components. With the form factor and system power a fixed specification (determining the minimum airflow requirement and fan size) we use thermal sensing diodes in the main ICs (GPU and CPU) and thermal algorithm firmware that reads the diode temperatures and adjust the fan RPMs by altering the fan voltage to a predetermined minimum requirement that minimizes the fan speed (minimizes the acoustics) while providing the required cooling capacity for the system.

The required cooling capacity of the fans is determined by the system electronics usage scenario; high cooling capacity is needed for intense game play applications, and less cooling capacity is needed for DVD movie viewing. Plus there's the operating environment (ambient temperature and altitude of the console) to consider.

Kreeeee · 12 Apr 2007 at 18:08

The fans are purely related to CPU temperature, nothing to do with Graphics card temp at all which is a poor design. Best not talk about it on here though as OcUK don't like any form of modding

Personally I replaced my fans with talismoon whisperfans and removed the crappy fan grills.

Booner! · 12 Apr 2007 at 18:25

I find the DVD drive the most annoying... well loud! :mad:

Sareth · 12 Apr 2007 at 19:19

Kreeeee said:
The fans are purely related to CPU temperature, nothing to do with Graphics card temp at all which is a poor design. Best not talk about it on here though as OcUK don't like any form of modding

Personally I replaced my fans with talismoon whisperfans and removed the crappy fan grills.

Not interested in modding, merely wether it is correct for them to be running at two different speeds. Doesnt what I just quoted re: thermal diodes on the cpu and gpu contradict what you just said ?

Could it be that the shroud that covers them both allows for greater airflow through the fan behind the cpu which would make it seem to be running faster ?

I used a tissue carefully cut into strips held at the back of the 360 and the fan nearest the power input and opposite the cpu is definately blowing out more air.