How to slow down fan speed?

G'day hardware geeks.....

My Thermaltake Element S case has two inbuilt 22cm fans that plug directly into the PSU. They are a little bit noisy, and I was looking to lower their RPM to take the edge off the whir.

Initially, I was considering purchasing a dedicated fan control to fit into a spare 5.25" drive bay, but a colleague suggested I might try and "cross-over" the yellow 6v cable from the PSU with the red 12v cable to the fan, to halve the RPM of the fan.

However, when I opened the case and examined the psu ---> fan connection, I noticed it already appears to be crossed-over as in the photo below (apologies for the poor quality).

The photo shows the yellow cable from the PSU on the left, connected to the red cable from the fan on the right. Thus, the fan is already running at half its RPM? Am I correct?

Regards,
Golden

No, the fan is running at 12V since the standard colour coding of power cables from the PSU is Yellow 12V, Red 5V, and Black 0V (ground). To make the fan run slower (approximately 45% in comparison), you need to arrange it so that the red lead from the fan is connected to the red lead at the molex connector. That way, the fan will be fed with just 5V as opposed to 12V.

Golden, repeat after me : "You are a muppet. Read your manual where it clearly states yellow = 12v".

Thanks Dwarf, I crossed over red to red with an intermediary molex, therby connecting 5v to 5v, and finally I can here myself think clearly. The silence is defeaning.

All is good. Fans running slower and temperatures actually seem to be a fraction cooler......

Regards,
Golden

to both.

Good suggestions.

Edit:
Glad to hear (pun intended) you got it sorted