My new WC build using the Obsidian 800D

Guys,
I am having some noise issues with the Xigmatek 120mm white LED fans attached to the radiator. I am using a Sunbeam Rhoebus fan controller and as soon as I turn the speed over half way they make quite a lot of noise.
I have all 3 fans wired into one 3 pin plug.

I dont think its vibration as the noise does not seem to change when I touch the fans.

Is it likely the fan controller is spinning the fans faster than they are designed for.
 
Looking good there, like the red in the res too.

Have you used Speedfan to see how fast your fans are running? They may be above their RPM or they may just be noisey fans. You've got them pulling into the case haven't you, have you tried turning them around? It may be that the fans have a high CFM and the rads aren't letting enough air through and its creating a vacuum between the rad and the fan.

edit; what are your temps like with that loop?
 
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Danm54 said:
Looking good there, like the red in the res too.

Have you used Speedfan to see how fast your fans are running? They may be above their RPM or they may just be noisey fans. You've got them pulling into the case haven't you, have you tried turning them around? It may be that the fans have a high CFM and the rads aren't letting enough air through and its creating a vacuum between the rad and the fan.

edit; what are your temps like with that loop?
Click to expand...

The temps are looking good so far, however I am just bedding the thermal compound in for the time being.

I hear what you are saying about the pulling air through scenario, this could be the answer. I just wish it was an easy thing to do turning the fans around :(

The fans are controlled by a controller. To check it with speedfan I suppose I would have to plug the fans/controller via the motherboard.
 
Do the fans run backwards if you swap the positive and negative around?

Forgot you were using a fan controller, dont think there's any way to check, you're going to get a max of 12v anyway so they cant run too fast.

You only need to run your fans quick enough to draw the maximum amount of air through the rad, any quicker and you'll get the noise but it wont increase the performance.

Ill be setting the rad and fans the same way as you but mine will blow air through the rad, positive pressure is quieter than negative.

Im a noob at this so it may be wrong, just makes sense to me :D
 
Danm54 said:
Do the fans run backwards if you swap the positive and negative around?

Forgot you were using a fan controller, dont think there's any way to check, you're going to get a max of 12v anyway so they cant run too fast.

You only need to run your fans quick enough to draw the maximum amount of air through the rad, any quicker and you'll get the noise but it wont increase the performance.

Ill be setting the rad and fans the same way as you but mine will blow air through the rad, positive pressure is quieter than negative.

Im a noob at this so it may be wrong, just makes sense to me :D
Click to expand...

In my last rig I had the fans on top of the radiator but still pulling the fresh air out of the case into it.

I have applied the same method to this rig but the fans are fixed to the bottom of the radiator and pulling fresh air in.

Are you saying you are going to be fitting your fans to the bottom of the radiator and pushing the air out of the case?
 
JaseUK said:
Are you saying you are going to be fitting your fans to the bottom of the radiator and pushing the air out of the case?
Click to expand...

Yea, it will create a positive pressure through the rad and be better for air flow in the case, ive got one on the rear 120mm fan and ill be doing the same with that too.

Ill let you know how it performs and what the noise is like.
 
Danm54 said:
Yea, it will create a positive pressure through the rad and be better for air flow in the case, ive got one on the rear 120mm fan and ill be doing the same with that too.
Click to expand...

I was under the impression it was better to move fresh air over the radiator. In your case you will be moving the already warm air inside your case over your radiator.
 
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JaseUK said:
I was under the impression it was better to move fresh air over the radiator. In your case you will be moving the already warm air inside your case over your radiator.
Click to expand...

Ideally you'd have your rads at the bottom of the case drawing cold air in. As they're at the top any heat in the case will want to rise and having intakes at the top stops this. I think there is only a couple of degrees difference and it helps the natural air flow in the case.

I guesse its personal preference though.
 
I've now fitted 3 gentle typhoon's 1850rpm to the radiator and oh boy what a difference.

I have also stuck some white cathodes in there to show it all off.

Pics to follow :D
 
Very nice :)

Although I would have the fans blowing out of the top rather than sucking in.

This way the case will still be cool as most of the heat will be in the loop.

--case top---
---Fans------
----Rad------
^^^^^^^^^
||COOL AIR|||
^^^^^^^^^

All other fans blowing into case with dust filters.

Just my 2p :)
 
DeadMan said:
Very nice :)

Although I would have the fans blowing out of the top rather than sucking in.

This way the case will still be cool as most of the heat will be in the loop.

--case top---
---Fans------
----Rad------
^^^^^^^^^
||COOL AIR|||
^^^^^^^^^

All other fans blowing into case with dust filters.

Just my 2p :)
Click to expand...

This is the 100 million dollar question, do they blow or do they suck

As soon as I change the fans to blowing out someone will say ah well I would have them setup to pull the air in as its fresh cool air and let the rear case fan suck the hot air out. :-)

I think whatever way you do it only makes 1-2 degrees difference.
 
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