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post #17581 of 19729
The best rule of thumb, and it seems to work with this case, is:

Intake at the front and bottom.

Exhaust top and rear.

If you want more silent operation, you will get away with just exhaust at top and rear, nothing else.
post #17582 of 19729
Quote:
Originally Posted by ginger_nuts View Post

The best rule of thumb, and it seems to work with this case, is:
Intake at the front and bottom.
Exhaust top and rear.
If you want more silent operation, you will get away with just exhaust at top and rear, nothing else.

IMO the "stock" set up is lacking. By stock I mean front and bottom =intake, Top and rear =exhaust.

After much experimentation I have settled on a positive pressure case flow (no exhaust fans at all). This set up has 1 big advantage's over negative pressure case.
1. DUST! using all intake fan's allow you to filter the air entering the case effectively. on a Negative pressure case the exhaust fans will actually suck in air from between side panels, Drive bay device's (CD drive's, Fan controllers, ect) and other place's you just cannot filter.

I would like to add that for the most part, PP setups have generally lower temps than an NP set up. There are exceptions to this but they are few and far between.

I would never suggest some one use a Negative Pressure case(like what you suggest at the end of your post). You have essentially created a bag less vacuum cleaner.
Edited by KhaoticKomputing - 7/9/12 at 5:36am
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post #17583 of 19729
Hi Guys!

Just thought to drop by here and show you my second CM690-II Rig.

535

22-drive UnRaid server. biggrin.gif
The front is a mess still but the insides are pretty much done.

Link to my Build-log at my sig. rolleyes.gif
     
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post #17584 of 19729
Oh wow! thumb.gif

Did you have to butcher other 690 cases to get enough racks?
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post #17585 of 19729
Quote:
Originally Posted by KhaoticKomputing View Post

IMO the "stock" set up is lacking. By stock I mean front and bottom =intake, Top and rear =exhaust.
After much experimentation I have settled on a positive pressure case flow (no exhaust fans at all). This set up has 1 big advantage's over negative pressure case.
1. DUST! using all intake fan's allow you to filter the air entering the case effectively. on a Negative pressure case the exhaust fans will actually suck in air from between side panels, Drive bay device's (CD drive's, Fan controllers, ect) and other place's you just cannot filter.
I would like to add that for the most part, PP setups have generally lower temps than an NP set up. There are exceptions to this but they are few and far between.
I would never suggest some one use a Negative Pressure case(like what you suggest at the end of your post). You have essentially created a bag less vacuum cleaner.

I was more stating to keep the air flowing from front bottom to top rear, which can be negative or positive pressure, which is easy enough to change.

But saying that if you want quiet, I have found running a negative pressure with the same fans a damn site quieter.

I have never really considered dust being a problem since it probably don't go a month with out it being opened, and then cleaned.
post #17586 of 19729
so far i am testing different fan configuration with good airflow/noise..
this my rig look like..
700
close up
700
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post #17587 of 19729
Quote:
Originally Posted by KhaoticKomputing View Post

IMO the "stock" set up is lacking. By stock I mean front and bottom =intake, Top and rear =exhaust.
After much experimentation I have settled on a positive pressure case flow (no exhaust fans at all). This set up has 1 big advantage's over negative pressure case.
1. DUST! using all intake fan's allow you to filter the air entering the case effectively. on a Negative pressure case the exhaust fans will actually suck in air from between side panels, Drive bay device's (CD drive's, Fan controllers, ect) and other place's you just cannot filter.
I would like to add that for the most part, PP setups have generally lower temps than an NP set up. There are exceptions to this but they are few and far between.
I would never suggest some one use a Negative Pressure case(like what you suggest at the end of your post). You have essentially created a bag less vacuum cleaner.

Countless tests have shown that the amount of dust is directly proportional to the amount of airflow. It's no different than filtering air in a car. Less flow = better filtration = less dust. If your equipment i has already reached a maximum cooling capacity at the lower flow levels, you might see better temperatures with a lower flow setup simply because there is less non-heat-conductive material between your coolers and the air flowing over it (less dust).

But it really does depend completely upon your configuration. Achieving good flow patterns will improve temperatures tens of thousands of times more than the silly "pressure" theories. Anybody who thinks their case has a different pressure than ambient needs a serious reality check. thumb.gif

Also look at it this way. If you clean your case and notice even dusting everywhere, you are doing cooling wrong. That means the air in your case is turbulent everywhere evenly. If you can see different dust densities leading from your intake, over your components, and to your exhaust then congratulations, you have good flow. Dust is carried by air, you should hope it's concentrated around the components you want cooled. Choose a priority, excellent flow or ease of cleaning. To have a quiet case you will really only be able to choose one.

Or go water and stop worrying about flow, just worry about whether the air going through your rads is hot or cold. All of these 'x is better than y' discussions are silly. If you have lower profile ram, you will swear by the benefits of a 5.25" bay fan. If you have Corsair Vengeance or other high profile ram, you will say those people are full of it. Just find what works for your components and run with it.

The dust filters on the 690II are horrible anyway. No computer fan will be able to maintain good flow and filtration while still being quiet. I run gelid wing 12pl fans which have static pressure similar to or slightly higher than AP-15s and the filters still make them work harder. I actually prefer a slight coating of dust since it lowers the air whoosh (the fan motors are super close to silent).

tl;dr: go water, acquire incredibly sexy cooling components, never look back.

jEWdNaRRJ1y1Z.JPG

j0NRm4Jq9SOGl.JPG
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post #17588 of 19729
Quote:
Originally Posted by MKHunt View Post

Countless tests have shown that the amount of dust is directly proportional to the amount of airflow. It's no different than filtering air in a car. Less flow = better filtration = less dust. If your equipment i has already reached a maximum cooling capacity at the lower flow levels, you might see better temperatures with a lower flow setup simply because there is less non-heat-conductive material between your coolers and the air flowing over it (less dust).
But it really does depend completely upon your configuration. Achieving good flow patterns will improve temperatures tens of thousands of times more than the silly "pressure" theories. Anybody who thinks their case has a different pressure than ambient needs a serious reality check. thumb.gif
Also look at it this way. If you clean your case and notice even dusting everywhere, you are doing cooling wrong. That means the air in your case is turbulent everywhere evenly. If you can see different dust densities leading from your intake, over your components, and to your exhaust then congratulations, you have good flow. Dust is carried by air, you should hope it's concentrated around the components you want cooled. Choose a priority, excellent flow or ease of cleaning. To have a quiet case you will really only be able to choose one.
Or go water and stop worrying about flow, just worry about whether the air going through your rads is hot or cold. All of these 'x is better than y' discussions are silly. If you have lower profile ram, you will swear by the benefits of a 5.25" bay fan. If you have Corsair Vengeance or other high profile ram, you will say those people are full of it. Just find what works for your components and run with it.
The dust filters on the 690II are horrible anyway. No computer fan will be able to maintain good flow and filtration while still being quiet. I run gelid wing 12pl fans which have static pressure similar to or slightly higher than AP-15s and the filters still make them work harder. I actually prefer a slight coating of dust since it lowers the air whoosh (the fan motors are super close to silent).
tl;dr: go water, acquire incredibly sexy cooling components, never look back.
jEWdNaRRJ1y1Z.JPG
j0NRm4Jq9SOGl.JPG


I'm not sure I under stand what your getting at?

The amount of dust has to do with airflow yes, but also filtration. With a negative pressure case you simply cannot filter all the air coming in, so more dust regardless of how much air flow you have.

If you take two identical case's with air filters on all intake fans and the same airflow, the positive pressure set up will have lest dust entering it, because more air entering the case is being ran though the filter, rather than from in between bay drive's, side panels and similar.

Lastly water cooling vs Air cooling is a debate for another thread. You go about setting up the case flow two differently.

I have plans to go water cooling but just cannot afford it at this time... a new toy followed me home and lets just say that 8 cylinder's, 12 PSI of boost, 5 spd and a Traction-Lok rear end take priority over water cooling.. can you say 11 second 1/4 time's on pump gas? because I just did lulz!
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post #17589 of 19729
Quote:
Originally Posted by alancsalt View Post

Oh wow! thumb.gif
Did you have to butcher other 690 cases to get enough racks?

Ruud at CM-store.eu hooked me up with two 3-drive HDD-cages. thumb.gif

As for the rest...
I happen to have four CM690's at the moment. doh.gif

I still think it was worth it! rolleyes.gif
( I did cannibalize my desktop rig though! ) weirdsmiley.gif


Well...
In the end you can't really have too many CM690s can you? biggrin.gif
     
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post #17590 of 19729
Quote:
Originally Posted by seeker fi View Post

Hi Guys!
Just thought to drop by here and show you my second CM690-II Rig.
Warning: Spoiler! (Click to show)
535

22-drive UnRaid server. biggrin.gif
The front is a mess still but the insides are pretty much done.
Link to my Build-log at my sig. rolleyes.gif

Very impressive have yet to see anyone on here use this case for a server, and i personally am pretty impressed, enjoy the color variations and colors itself, wouldn't mind seeing the front and such to actually really see the exterior color. Like i said definitely impressive, ive never built a server nor have needed that much space personally for anything, even though i do have about 3 1/2 Tb or music and movies after backing up most my 300+ DvD collection, and others from downloads and various friends. maybe one day i will have to make a powerhouse, and can see our trusty cases can do any job! lol
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