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05-24-2006, 12:36 PM
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#1
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Admin
Join Date: Feb 2005
Location: Ann Arbor, MI
Posts: 11,783
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Push/pull with two (very) different fans?
Technically this is a watercooling question, but it mostly deals with fans, so I figured I'd ask here.
Wondering if a push/pull design with two very different fans would be worth anything...the fan I'm planning to push with has more CFM out through the rad than the pull fan has total (I put my face on the rad and measure that way, much more accurate than hands it seems).
The push fan would be ~100CFM (at peak, it won't always run that fast) and the pulls are around 60CFM if I had to guess (unrated, came with my PC-7B+).
I have these fans lying around and I'm really not sure what to do with them 
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05-24-2006, 02:08 PM
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#2
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Registered User
Join Date: May 2006
Posts: 94
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So these fans would be on opposite sides or the same rad? If that's what you meant, I wouldn't do it. Having an extra fan will cause more interference than anything else, especially with the fast one blowing into the slow one.
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05-24-2006, 02:26 PM
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#3
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Admin
Join Date: Feb 2005
Location: Ann Arbor, MI
Posts: 11,783
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Alright, that's what I thought...now to figure out what to do with these fans though 
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Current Waterblock Testing
Roundup #2: Overall Comparison Thread, Alphacool Livingstone, Alphacool Niagara, Alphacool Yellowstone, D-Tek Fuzion V2, EK Supreme, EK Supreme LT, Enzotech Sapphire Rev A., Heatkiller 3.0 LC, Heatkiller 3.0 LT, Koolance CPU-345, Koolance CPU-350, Phobya, Swiftech Apogee GTZ, Swiftech Apogee GTZ SE, Swiftech Apogee XT
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05-24-2006, 03:02 PM
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#4
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Registered User
Join Date: May 2006
Posts: 94
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Quote:
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Originally Posted by Vapor
Alright, that's what I thought...now to figure out what to do with these fans though |
Send them to meeeeeee! 
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05-24-2006, 05:29 PM
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#5
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Xtreme Member
Join Date: Aug 2004
Location: Manchester@UK
Posts: 267
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Quote:
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Originally Posted by Vapor
Alright, that's what I thought...now to figure out what to do with these fans though |
let the 60cfm push and use the 100cfm to pull, IIRC its better that way (from my Shuttle day)
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E3110@3.6Ghz || Gigabyte P45-DS3 || 2GB Cellshock 6400 || Asus HD4850||
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05-24-2006, 06:14 PM
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#6
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Xtreme CCIE
Join Date: Dec 2004
Location: New to St. Louis, MO
Posts: 3,097
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Quote:
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Originally Posted by ken
let the 60cfm push and use the 100cfm to pull, IIRC its better that way (from my Shuttle day) |
Yes, smaller to push, larger to pull.
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PSU: Cooler Master UPS900
OS: VMWare ESXi 4.0... so... "various"
GPU: N/A
Display: N/A - Accessed via network
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05-25-2006, 03:20 AM
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#7
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Xtreme Member
Join Date: Mar 2006
Posts: 98
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will get better air speed and latent pressure with it small to big so i wud go for it that way. 
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05-25-2006, 04:47 AM
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#8
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Xtreme Addict
Join Date: Sep 2004
Location: Fantasia
Posts: 1,599
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Gosh, it'd be hard to calculate what cfm a pulling fan needs to move to be worth it. It'd have to be moving air better than with no fan. If it actually moves less air than what is coming out of the rad with only one fan, it's not worth it.
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