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post #5241 of 19729
Quote:
Originally Posted by doat View Post
miloshs i think you should have the exhaust fans the same speed or faster than the intake fans.
I agree. Negative pressure is a positive thing to have!

Or, negative pressure provides positive results!
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post #5242 of 19729
Quote:
Originally Posted by TwoCables View Post
Then damn, I definitely need to keep this 4-3 device in mind. I mean, not only does it look nice, I can put a good fan on it, and I can knock out the HDD bay.

But, what did you mean by the following?

Especially the part about joining the 5.25" bay with zip ties. But I kinda need help understanding every word. I mean, when you took it out with a hammer and screwdriver and just punched out the rivets, how much damage did the bay receive? Will I need to accept any other damage that gets done by removing the rivets?
There was no damage to the 5,25" bay. I just punched out the rivets and ziptied (or u can use the rivet gun if you have one) the holes where the rivets were... HDD bay on the other hand, well lets say it was unusable

Quote:
Originally Posted by doat View Post
miloshs i think you should have the exhaust fans the same speed or faster than the intake fans.
Actually NO! Its all about CFM (and math)

You see those 140mm fans are rated at 104.54CFM @ 1900rpm which makes them aprox 41.27CFM @ 750rpm. That makes it 2x41.27=82.54CFM while the 120mm fans that i have for intake are rated at 39.77CFM @ 1200rpm, so that makes it 2x39.77=79.54CFM...
And with the addition of that 120mm exaust (aprox 16.57CFM @ 500rpm) that makes it
:

2x41.27-2x39.77+16.57=19.57CFM wich means I have more exaust than intake
Edited by miloshs - 6/11/09 at 9:53am
    
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post #5243 of 19729
Quote:
Originally Posted by TwoCables View Post
I agree. Negative pressure is a positive thing to have!

Or, negative pressure provides positive results!
I thought it's the other way around?!

Less dust having a positive pressure inside the case w/c means intakes should be more powerful (higher cfm) than exhaust ..

Check here http://www.silverstonetek.com/tech/w...e.php?area=usa
Edited by YaGit(TM) - 6/11/09 at 10:01am
    
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post #5244 of 19729
Quote:
Originally Posted by YaGitâ„¢ View Post
I thought it's the other way around?!

Less dust having a positive pressure inside the case w/c means intakes should be more powerful (higher cfm) than exhaust ..
Yes, but....

More intake = less dust = more heat
More exaust = less heat = more dust

So really either way, you're screwed
    
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post #5245 of 19729
Quote:
Originally Posted by miloshs View Post
There was no damage to the 5,25" bay. I just punched out the rivets and ziptied (or u can use the rivet gun if you have one) the holes where the rivets were... HDD bay on the other hand, well lets say it was unusable



Actually NO! Its all about CFM (and math)

You see those 140mm fans are rated at 104.54CFM @ 1900rpm which makes them aprox 41.27CFM @ 750rpm. That makes it 2x41.27=82.54CFM while the 120mm fans that i have for intake are rated at 39.77CFM @ 1200rpm, so that makes it 2x39.77=79.54CFM...
And with the addition of that 120mm exaust (aprox 16.57CFM @ 500rpm) that makes it
:

2x41.27-2x39.77+16.57=19.57CFM wich means I have more exaust than intake
ah i see, are you making up the part after the decimal? like are you making up the .57 in 16.57cfm?
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post #5246 of 19729
Quote:
Originally Posted by doat View Post
ah i see, are you making up the part after the decimal? like are you making up the .57 in 16.57cfm?
Nope...

39.77:1200=X:500
1200X=39.77x500
1200X=39.77x500=19885
X=19885/1200
X=16.5708333333333 ~= 16.57
when rounded to two decimals...

Should know your proportions calculation

P.S. is it just my net, or has OCN really slowed down in the last hour?
    
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post #5247 of 19729
Quote:
Originally Posted by miloshs View Post
Nope...

39.77:1200=X:500
1200X=39.77x500
1200X=39.77x500=19885
X=19885/1200
X=16.5708333333333 ~= 16.57
when rounded to two decimals...

Should know your proportions calculation

P.S. is it just my net, or has OCN really slowed down in the last hour?
wow, i dont know if OCN slowed down i was playing a game.
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Lateralus
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post #5248 of 19729
I probably need more exhausts on my case. As I have a triple rad in the top I have those 3 fans on intake I then have the front lower fan on intake and then the only exhust is the 120mm at the back of the case
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post #5249 of 19729
Quote:
Originally Posted by miloshs View Post
^Well it all depends on the case setup, thats why i always say what is my fan placement before stating that something works better or worse.
As far as i'm concerned, top fan thats closest to front helps me lead out hot air from my RAM as it is located right above the dimms, and top front fan delivers some fresh air onto the dimms...

It really all depends on the whole setup of your rig. For example some ppl might have dimms in other places, maybe they wont have passively cooled HD4850, and maybe they wouldn't have removed the HDD bay to improve airflow in the lower part of the case...

I can, with great confidence, say that after i removed the HDD bay the airflow in the lower part of the case and around the GPU was greatly improved, and the bottom fan has thus been unnecessary for my rig.
Yeah I can see with how yours is set up that might be so, especially after seeing your pics. Interesting work you've done on yours btw. On that second build if I have the room I may place a second fan on the front where the DVD players go, we'll see. I know my memory in my Q6600 build stays cool enough. I don't have a fan on it at all but there is so much air flow going through the case anyway, and I don't have my memory OCed.

If I had it to do again I probably would opt for the 590 for the second build. Oh well. That E5200 is going to get my Tuniq Tower, and I have a Noctua NH-U12F being shipped now to take it's place here. For the Tuniq though I'm going to try to add an extra fan on the front so that it has two fans on it. That should be interesting.

As far as negative/ positive pressure, I tend to go for more positive pressure. My thinking is that as long as I get the cool air in there it can find a way out. Often I think that fans blowing air out take whatever is available to them, and that may not be totally comprised of the air from the circuit I'm trying to create. Just my own theories.
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My System
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post #5250 of 19729
Quote:
Originally Posted by miloshs View Post
There was no damage to the 5,25" bay. I just punched out the rivets and ziptied (or u can use the rivet gun if you have one) the holes where the rivets were... HDD bay on the other hand, well lets say it was unusable
Was there any damage done to the floor of the case?

By the way - and I apologize for this - I am still confused as to what the zip ties are for. I mean, what happens when the HDD cage is removed?
Quote:
Originally Posted by YaGit™ View Post
I thought it's the other way around?!

Less dust having a positive pressure inside the case w/c means intakes should be more powerful (higher cfm) than exhaust ..

Check here http://www.silverstonetek.com/tech/w...e.php?area=usa
It's Backwards Day today. Sorry about that.
It's a computer!
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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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