Should fan headers A and B be separately configurable?

[jonstatt]

I have 2 front case fans connected to 1A and 1B headers


I have 1 rear case fan connected to 3A header

The H100i of course has it's own monitoring with Corsair Link software but the pump feed is connected to the CPU header

In Fan Xpert it seems to be upset that I don't have anything connected to 2A or 2B. There seems to be no way of simply telling Ai Suite that I don't have a fan connected there (even if its disabled in BIOS) and it shows up in the software almost as if there is a failure.

On the other hand, it shows the fan connected to 1A and 3A and allows me to choose where they are. But it doesn't show me anything for 1B except for the fan monitoring which shows the RPM correctly.

Is it simply that the B headers are slaves to the A, so if A gets RPM'd up, that B does too?

In which case the confusion is just that it doesn't seem to like not having anything connected to 2A/2B.

[skypine27]

I found out through experimenting that the A and B headers of each channel can NOT be separately controlled:
http://rog.asus.com/forum/showthread.php?54471-Small-bug-with-Fan-X-Pert-or-bad-headers

So you really only have 4 different fan speeds you can control:
1. CPU
2. CHA1
3. CHA2
4. CHA3

So even though you can plug in 2 x fans on each channel (or more with Y-cables), you can NOT control the speeds of the A and B channel separately. So yes, you cant really chose where fan 1 "B" is. YOu can only chose where the fan(s) connected to CHA1 are, CHA2 are, CHA 3 are. There is no way to differentiate between the A and B channel.

And yeah, my fan x-pert also shows a red "0" on the B channels I do not have a fan connected to (my A channels are all connected).

What I am still unclear about, and don't have time to experiment, is if the CPU_OPT plug behaves the same as the A/B of the CHA headers. I believe it does, in that you can NOT have 1 x type of fan connected to the CPU and a different type of fan connected to CPU_OPT. Fan x-pert will get confused and mess up.

I run a Corsair H80i and I do NOT plug in the pump RPM plug into any fan port for the reasons above. It will mess up whatever other type of fan is connected to the other channel. That plug is just for RPM monitoring anyway, the pump never slows down on the H80i or H100i, it runs at max RPM. So I just live without the monitoring of it now.

Fan X-pert works great once you treat the A/B header of each channel like they are the same plug, and don't hook different fans (or pumps) to them.

[Winifred_Payne]

The fan headers are shared.

Only the A headers of each Channel are controllable.
The B header will use the same settings you apply to the A header.

[Praz]

Hello

As Winifred has noted the B headers are slaved to the A headers of each group. This also applies to the two CPU fan headers.

[bobbagels]

Praz wrote:
Hello

As Winifred has noted the B headers are slaved to the A headers of each group. This also applies to the two CPU fan headers.

Ah - Ha
Thank You

[kthanos]

Same problem with Rampage V Extreme...

[Chino]

It's not a problem. As Praz has mentioned, it is by design.