Rampage IV BE - No PWM control ?!?!??!

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19 Jul 2014
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3
I must be dreaming. I thought this was targetted at overclockers and yet somehow it seems that I'm slowly finding that it is a piece of crap!

Have found a few other posts now relating to people finding that of the 8 4-pin fan outputs on the thing, that only CPU and CPU_OPT can actually control the speed of a PWM fan, and even those two are actually tied.

But like at least one other post I've found, I can't actually get any control of any PWM fan from any header, either by tweaking in the bios or in AI Suite Fan Expert II.

The board came from overclockers.co.uk flashed with latest bios, it also came from them with the fans from the radiator (H110) plugged into the splitter on the back and hence rigged for just max voltage (just a 3 pin parallel thing).

Have tried the 4 fans I just bought in my old PC and also the two (LOUD) corsairs I'm replacing with them in my old PC (a very old very standard mboard) and they are all perfectly controllable with PWM, so nothing wrong with the fans.

I've tried all of the headers, they will happily adjust 3-pin fans, and they all can read the speed of both 3-pin and 4-pin fans.

This is insane, I'd have jsut sent the thing back if I thought it was something broken but I'm struggling to find that to be the case - several posts on other forums about the same thing, and I keep reading people's builds with other 2011 socket IV BE boards and they are all using 3-pin fans, they don't say why, they just seem to be using them.

Please someone tell me that I'm wrong and that there is a setting somewhere. No guessing please, no extrapolating that it must be madness 'cos you have a similar board that runs 17 PWM fans and yours cost way less etc., or any reading of spec sheets... someone out there must have the same board in their computer and be controlling the speed of PWM fans, surely?

I've tried playing with all the settings under the bios for fan control, I can't find a single one that makes any of the fans go any faster or slower, disabling q control, putting on 'turbo' or 'silent' etc. They do nothing for any fans, 3-pin or 4-pin. The AI suite seems to be able to adjust the 3-pin fans, assuming I plug them into one of the four headers it can control, CPU, Chassis1, 2 &3. It can read the speed of all fans, be they 3 pin or 4 pin and in any of the aforementioned or any of the opt fan headers.
 
Further to my last, I have found that I can control ONE PWM fan, or one splitter with a few fans in it. To do this it must be in the CPU header, and the CPU_OPT must be empty.

Tiny issue though, this means that my water pump (the corsair 110 one) has to go in something else, which you'd imagine wouldn't be an issue, except that while in CPU it had been reporting 1503 RPM, in the chassis headers it gets just 700 RPM. I would have thought these would be at the same voltage, but perhaps not?

This is not enjoyable.
 
So it seems that Chassis_1 will allow the CPU to get up to 1500 again, the others will not.

At least thats the control I need, only just, and its insane considering how many headers there are, but hey it works.

One interesting thing, I had been disabling q-control on the cpu header when running the pump on it, but if I do that on Chassis_1 it runs at 850. I have to turn Q-control back on and then in AI suite run the tuning and then flatten the control graph out to run it on max and it will then do 1500 again.

It doesn't do the same on the other headers.
 
You could try searching the forum for this question and your motherboard as I'm sure its popped up before. Something to do with voltage control instead of PWM
 
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