Fan header use heats up PWM IC area

[GeezerMan]

Got a strange one here. I suggested a Antec Solo case for a neighbor, since I use one myself. Figured I would advise a similiar setup of fans that I use.
On mine, I installed 2 front 92mm fans in my Solo, and at first it raised one of my temps until I moved the IDE cable around. It was deflecting hot hard drive heat toward the motherboard.
Anyway, he calls me to say that his PWMIC temp went up a few degrees with the 2 fans running on one of his fan headers. The fans draw 2.1 watts each, so the label says, and even on low speed, his temp raises. I'm thinking deja vu, but he insists there are no wires in the way, he has only one drive internal now. Must be the current draw on the fan header. Even with the case side open, it does the same thing. He's using one fan header that's near the PWM IC. But should only 4.2 watts cause this?, especially when they are running at half RPM? He likes the ability of having bios control, but it's not worth it if it burns out the fan header. So, for now, he's going to get a fan controller. I run both of my fans on one fan header just fine. Maybe he has a bad fan, that's drawing too much juice.

Thanks

 

[Modelworks]

At 4.2 watts your using 350 milliamps of current.
Not enough to destroy any header that I have ever seen.

Most quality motherboards have current protection on fan connectors.
Either the type that will reset when the current reduces or standard fuse type that will blow to prevent fire/further damage.

 

[covert24]

yea that shouldn't be causing any heat. and as model said most mobos have current protection. Not like back in the old days on my S478 Intel mobo where only the cpu header worked and the rest of them blew.

 

[GeezerMan]

I walked over for a free beer and a look myself. We took the fans off of the front, and put them on the table, still connected. I watched, and sure enough, the temp did rise 4 degrees every time we turned them off then back on. No biggie, but still a puzzle. This is on a DFI board, just a few months old. Got to be the current draw.