Question about using 7v

[app25]

So I have read some people say that using the 7 volt mod is bad for the PSU as it is feeding current back into the psu by combining the 12v and 5v line. I am not doing this mod but I am using my define r4 cases integrated fan controller for my 2 case fans. The controller can be set to 7v which I find optimal. How does this fan controller work? Does it do the same thing as the mod? or is it dangerous to use the 7v fan controller setting?

 

[madmatt30]

The r4 fan controller uses a resistor to vary voltage & has nothing in common with the 7v mod.
Saying that IMO the 7v mod is safe anyway - unless you were running dozens off fans using that mod the feedback to the PSU is absolutely minuscule.

 

[app25]

Thanks, didnt know it used a resistor