CPU fan -> power from "chassis fan" connector?

mpdos

Reputable
Jan 20, 2018
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Hello,

I have a HP Compaq 6305 SFF desktop PC that has become my main computer after my previous machine suffered motherboard capacitor death.

However the CPU cooling arrangement seems to be inadequate to the task. The heatsink mounted on top of the processor has no fan, and the only other cooling comes from a system fan positioned at the front of the machine with a plastic shroud which "directs" air current towards it.

As soon as one of the four cores of the AMD A10-5800B processor becomes taxed, the reported temperature races up to 90-110 degrees Celsius (194-230 Fahrenheit) - I'm using CPUID HWMonitor.

I ordered an Arctic Alpine 64 Plus CPU cooler to try to deal with this. But it seems that the motherboard has some weird proprietary mounting arrangement that I hadn't appreciated until I came to try to fit the new cooler...

So now I have a redundant fan and heatsink, and an overheating machine. I'm hoping I can Jerry-rig the Alpine fan into position towards the CPU heatsink somehow (with cable ties) to try to contribute a cooling effect, because at this point any additional cooling would be helpful.

But what I've now discovered is that the free motherboard CHFan header (which I'm assuming to stand for "CHassis Fan") won't fit the connector on the end of the Alpine fan. There are two plastic spines on the back of the fan connector that don't mate together with the shape of the header.

Cable.jpg


This is all getting a bit messy. But if I were to cut these spines so that the plastic on the back of the fan connector was completely flush, would there be any issue - electrically - with plugging the fan in to this connector (they're both 4 pin)? I have to imagine there's some reason it's been designed this way (to prevent them from fitting correctly as-is).

I believe that the part number for this motherboard is 703596-001, but I'm going by the information in this manual and the note about the motherboard supplied with machines originally running Windows 7 (the PC case has a Windows 7 Pro product sticker on it).

Thank you.
 
Solution
Compaq and HP are famous for doing things proprietary and so the pin-out might be different too. If it were me I'd measure the pins with a multimeter to make sure the voltage pin at least is connecting to the correct socket in fan connector to avoid frying something in the fan or worse in the motherboard.

HSense sounds like a connection for a sensor of some sort and that's defo not a fan.

In general, it's really not adviseable to just try plugging things in when you're not sure what it is.

mpdos

Reputable
Jan 20, 2018
5
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4,510
Thanks for replying. Simply, technical ignorance. I hadn't considered that it was an option. I've no idea what "HSENSE" stands for, and assumed this was some special purpose I/O that wouldn't be compatible. I'd appreciate an explanation of what its purpose is and reassurance that it won't cause any issues.



 
Compaq and HP are famous for doing things proprietary and so the pin-out might be different too. If it were me I'd measure the pins with a multimeter to make sure the voltage pin at least is connecting to the correct socket in fan connector to avoid frying something in the fan or worse in the motherboard.

HSense sounds like a connection for a sensor of some sort and that's defo not a fan.

In general, it's really not adviseable to just try plugging things in when you're not sure what it is.
 
Solution