View Full Version : quick question on H5O push-pull config
Have just upgraded my old sckt939 PC (after probable PSU failure and troubleshooting technique involving replacing all the bits one by one....:rolleyes:) to new i5-750 with asus P7P55d-evo. Have gone with corsair H50 cooler also. Not yet up and running as have three young kids and hard to get the time!
Anyway quick question--> have two akasa apache fans with 4 pin PWM connectors. Was going to use them in push-pull pushing air out the back (just doesn't make sense to me to follow corsairs recommendation). My question is: where should I plug the fans in? I assume the push fan should go in the CPU-fan header - should the other fan go into the fan2 header (right next to it, also 4 pin)? Will the mobo run both fans at the same speed?
Also, if I'm not going to push the CPU past about 3.8ghz, would I be better off just using one fan in push mode and one fan blowing onto the GPU/VRMs since the corsair obviously doesn help cool the mobo?
Appreciate any advice.
Calzone
The fan headers should be fine on the motherboard. You might want to check the BIOS as certain motherboards have fan control settings for different headers. You'll soon see if they are running at different speeds. Although if you wanted more control then a Zalman fan mate or a rheobus fan controller is a good idea.
As for the second question, it depends on your case really.
There is some good info here: http://blog.corsair.com/?p=987. Also if you google image "push pull h50" you'll see plenty of pictures on the various setups. I wouldn't worry too much about the graphics card, they can usually take care of themselves. Obviously if you get issues with temps and instability you can look into changing it around.
CMDR Furries
26-02-10, 13:51
Ive had my Corsair H50 for a while now using a push-pull config. As with you, Corsair's suggested method didn't make any sense to me. I did notice however that my motherboard is running far hotter than before; 65c when playing games compared to 50c when i had a IFX-14. Doesn't seem to affect stability thou.
When i upgrade to i7, i'm going to try mounting the radiator at the front with two fans. :)
I have a IFX-14, just wondered how you found the move to H50 bar the increase motherboard temps? How much have temps dropped?
I think my IFX-14 isn't mounted properly on my UD5 as I get very high temps when clocking to 4GHz. A remount in my P180 is a pain though.
Personally i would never run 2 fans on a heatsink (or rad) in push pull that weren't powered from the same source, be that mobo header or seperate fan controller. You really need the fans running the exact same speed, or near as damn it, or they will be fighting against each other. The only way i know of doing that is to power them from a single source.
I have a IFX-14, just wondered how you found the move to H50 bar the increase motherboard temps? How much have temps dropped?
I think my IFX-14 isn't mounted properly on my UD5 as I get very high temps when clocking to 4GHz. A remount in my P180 is a pain though.
how have you got it pointing? air out the back or the top of the case?
how domed is the base? only they can be as bad as the true.
calzone, from what i have seen using the fan casing as a shroud between a working fan and the rad can drop your temps as much as adding a pull fan. only down side is it means killing a fan to just use its housing.
CMDR Furries
28-02-10, 22:00
I have a IFX-14, just wondered how you found the move to H50 bar the increase motherboard temps? How much have temps dropped?
I think my IFX-14 isn't mounted properly on my UD5 as I get very high temps when clocking to 4GHz. A remount in my P180 is a pain though.
I did find it decreased temps by a couple of degrees, but i did get a H50 to quieten the system as well as too increase cooling.
Will buy the akasa PWM splitter such that the fans run off the same feed - I assume the Mobo can supply enough juice to run the two fans no problem. That way they shouldnt fight - they are the same fan.
Also now looking to replace older case fans - pc still pretty noisy with old 120/2x92 case fans running off molex. obviously need the fans to connect to the motherboard headers or have pwm fans. also my bequiet P8 PSU has "clever" fan voltage control on its dedicated fan rails - might give that a try.
havent pushed the machine yet so not sure on temp performance.
With the single Corsair fan it performs well with mine at 3.8Ghz, yet to see it go over 63 degrees. Only problem is that the fan does sometimes turn itself up during day to day usage.
im running 2 fans push-pull through the radiator, both using same motherboard header without any problem.
remember, those fans are voltage controlled, so as long as your mobo header can supply enough current, the fans will operate at same speed.
i simply took the header off one fan, and squeezed into the other fan's header, very basic wiring.
as for PWM controlled fans, mobo header should also work. PWM stands for Pulse Width Modulation, so the speed of target fan is controlled by the pulse duty cycle, again it will be a voltage controlled. therefore as long as the fans are connected in parallel, there shouldn't be any problem.
I got myself an Akasa PWM splitter, so now running both fans (and a 92mm exhaust fan) off the CPU fan header and it works fine. There is just a little bit of an interference pattern noise which i assume comes from the two fans being ever so slightly out of phase with each other, but otherwise it works fine (the splitter comes with a molex connector so dont need to worry about the CPUheader being able to supply the current). Haven't tested CPU temps yet but at idle temp is mid-20s.
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