Tu by sa dalo teoretizovať tým, že karta sleduje aj cifry otáčok a ak klesnú pod určitú úroveň, nastáva tá istá reakcia /myslí si, že fany zastali a nakopne ich/. Ale to sú všetko skôr také výstrely do tmy.
Tu výcuc v rovnakom duchu z linku v mojom prvom príspevku, ale sú to všetko dohady...
I have the exact same issue. I had the ACX cooler but the fans on that would oscillate against each other that created an annoying humm. Got the XIII, install was easy enough. but the new fans ramp up like everyone elses. My hunch is this:
The fan controller on the board detects the fan speed. If it senses the fan's have stopped, it will cut power for a second, then attempt to ramp up to 100% for about 5 seconds then idle down once it senses the fan's spinning again (most likely to un-stick the fan when it gets older). You can try this on any 780 cooler by stopping the fan with your hand until it cuts power, then letting go.
I am thinking that the XIII is tripping this sensor. I pulled up hardware monitor to check the fan speed and it is all over the place every time it updates. Right now my min/max are 0/57792 (yes, 57k) rpm respectively.
I have an accelero xtreme plus on my 480gtx. The fans look the exact same however it only has a 4-pin connector not the 4-and-3-pin. I am going to connect that one and see if this persists.
Because this is a built in fuction of the GPU, manually controlling the fan from precision will not fix the problem.
*update* the fans from the AXP did the same thing. Removing them I noticed that the AXPlus fans required .15A each, the AXIII fans require .12A each, and the stock ACX fans require .55A each. Maybe something to do with it?
My guess is that the fan's don't draw enough current for the fan controller on the GPU to register them as 'spinning'. Maybe a firmware update could fix it. I am not sure though.