4890 as pwm fan controller

[Yong]

Hi there,
Does anyone know what is the maximum ampere that Radeon 4890 pwm fan header can support?
I have tried one 1.3A nmb-mat 120mm fan, and it works.
just wanna know the maximum ampere so i could control the 2 nmb-mat fans

[demonkevy666]

Hi there,
Does anyone know what is the maximum ampere that Radeon 4890 pwm fan header can support?
I have tried one 1.3A nmb-mat 120mm fan, and it works.
just wanna know the maximum ampere so i could control the 2 nmb-mat fans

I don't know but consdinering the blow fan is pretty high amp I'm probably say it might burn out if you try higher.

you'd have to find a reference card spec sheet.



(p.s more anime girls Mio from K-on! again lol)

[Yong]

I don't know but consdinering the blow fan is pretty high amp I'm probably say it might burn out if you try higher.

you'd have to find a reference card spec sheet.



(p.s more anime girls Mio from K-on! again lol)

Yeah was afraid of that, but i couldn't find the full spec for 4890.
I have read some review about 68x0 gpu review, and it does state name of pwm controller chip used on 68x0.
im pretty sure the controller chip might be different from older gpu.
i used run dual 4890, but sold of the other one because it was underutilized

Just bought Lamptron fc5v2 but i don't think it can control a 4-pins pwm fans
Sigh...

(P.S Mio is one of my favorite anime character, plus i like monochrome art)

[brinox]

yong, did you ever nail down a max current for the 4890? if not, i would just create a Y cable that pulls power directly from the power supply, and then hitch the PWM/tach from the other side to the GPU fan header. this keeps the RPM and PWM connections live, but doesn't tax the power circuit. I made an adapter that plugs directly into the GPU PWM header, and converts it to a standard motherboard PWM header. it wouldn't be too hard to splice off the power from that to another connection of your choice.