Page 1 of 2 1 2 LastLast
Results 1 to 20 of 30
  1. #1

    Push/Pull vs push vs pull for Radiator?

    What is the best way to keep a decent airflow through a radiator?
    I'm going to get a swiftech mcp220qp (haven't decided on built in res or micro res yet), but I am curious as to whether a push/pull set up will actually work better than a push set up? It seems to me that the fans would have to be designed to work in such a fashion for it to provide any real benefit. I'm debating whether to get the extra fans, I currently have a couple of 120mm 100+ CFM fans as my intake, that I plan to use on the radiator, since the radiator is going to obstruct them anyway. Would adding the extra fans to the back of the radiator prove useful at all?
    /////Intel i5 3570K @ 4.5Ghz || XSPC Raystorm
    Sapphire R9 290X @ 1175/1625 || EK Fullcover Waterblock
    ASUS TUF Sabertooth Z77 Mobo || XSPC AX360 Radiator
    24GB DDR3 1600 Crucial Memory|| XSPC AX240 Radiator
    /////////////Corsair hx1000w || MCP355 w/Heatkiller DDC Top
    2x256 GB SanDisk SataIII SSD || FrozenQ Fusion V Reservoir

  2. #2
    Unoriginal Macho Moderator nikhsub1's Avatar
    10 Year Badge
    Join Date
    Oct 2001
    Location
    Los Angeles
    LOL not with 100+ CFM fans it wont... not anything noticeable anyway. If you were running 40 CFM fans, then perhaps the push/pull would make a difference.
    Loading Signature ...

  3. #3
    Member
    Join Date
    Jul 2002
    Location
    BFE, IN

    This may help

    This article may help from martin's site. The initial test was regarding using a shroud but he also tested push/pull vs push vs pull.

    http://www.martinsliquidlab.com/Radi...ng-Review.html

  4. #4
    Ya lol obviously I don't care much about noise... I've got 3 of those fans plus my 2 9800s plus my CPU HSF with a 92mm fan on it =) oh and don't forget the 200mm BigBoy on top

    thanks for the info, looks like I will be doing the high speed push with ~30mm shroud
    /////Intel i5 3570K @ 4.5Ghz || XSPC Raystorm
    Sapphire R9 290X @ 1175/1625 || EK Fullcover Waterblock
    ASUS TUF Sabertooth Z77 Mobo || XSPC AX360 Radiator
    24GB DDR3 1600 Crucial Memory|| XSPC AX240 Radiator
    /////////////Corsair hx1000w || MCP355 w/Heatkiller DDC Top
    2x256 GB SanDisk SataIII SSD || FrozenQ Fusion V Reservoir

  5. #5
    Member
    Join Date
    May 2008
    Location
    Little Rock, AR
    Quote Originally Posted by iLoki View Post
    Ya lol obviously I don't care much about noise... I've got 3 of those fans plus my 2 9800s plus my CPU HSF with a 92mm fan on it =) oh and don't forget the 200mm BigBoy on top

    thanks for the info, looks like I will be doing the high speed push with ~30mm shroud
    Although you say the sound doesn't bother you, you may be surprised at just how nice it is to sit at your computer and NOT hear a jet engine next to you. The Swiftech rads work VERY well with med CFM (quiet) fans. Changing from 1500RPM/28db Yate loons to Kaze Ultra 3000's/40db only netted a 2-4C difference in cooling, with a properly sized rad. If you REALLY want that extra 2-4C at the cost of the noise, then by all means go for it. If you wanted to push/pull, i'd definitely go for some LOW flow 1300 RPM Yates on either side. The added benefit of WCing is that you now get to move heat output from one of the biggest heat producers away from your important parts. What this means is, you can use quieter fans in the case.

    Axis

  6. #6
    Registered
    Join Date
    Sep 2007
    The best configuration for fans is a pull. push/pull creates turbulence and noise which will kill any benefits. In my experience, fans like resistance of pulling rather than pushing, but it is important to have pressure in there somehow.

  7. #7
    Quote Originally Posted by imprez55 View Post
    The best configuration for fans is a pull. push/pull creates turbulence and noise which will kill any benefits. In my experience, fans like resistance of pulling rather than pushing, but it is important to have pressure in there somehow.
    You're saying push/pull is worse than pull only? . According to martin
    2 fans Push/Pull vs others - It was very clear that when using two fans per radiator section, that the radiator intself acts as a flow spreader and provided great benefit to straightening out the air for the second fan in a push/pull configuration. Just like doubling up with a pump, there is a pressure benefit to doubling up on fans and this translates to about a 20-30% performance gain. The added fan pressure simply means and added gain in air flow and corresponding performance. None of the experimental pull/pull or push/push configurations provided any noteworthy benefit as it seams the air is simply too disturbed from the first fan to allow the second to perform properly when air is moving. I would always recommend a push/pull configuration for two fans and add a shroud to both sides if space allows.

  8. #8
    Disabled
    Join Date
    Jul 2008
    how loud are the medium yl's?

  9. #9
    Member
    Join Date
    May 2008
    Location
    Little Rock, AR
    Quote Originally Posted by noobert View Post
    how loud are the medium yl's?
    They sound like this .................

    They are very quiet but it depends on your reference. I think they are rated at 33db which isn't bad at all. For the price of 3 yate loons, you can add a Sunbeam 4 channel fan controller and still come out cheaper than 3x of most other fans alone.

    Axis

  10. #10
    Well, I've already got some high speed fans, and the push/pull in martins review worked best with low speed fans. I plan to use a shroud and a push set up for now, and maybe after a little while try a push/pull with another shroud on the other side.
    /////Intel i5 3570K @ 4.5Ghz || XSPC Raystorm
    Sapphire R9 290X @ 1175/1625 || EK Fullcover Waterblock
    ASUS TUF Sabertooth Z77 Mobo || XSPC AX360 Radiator
    24GB DDR3 1600 Crucial Memory|| XSPC AX240 Radiator
    /////////////Corsair hx1000w || MCP355 w/Heatkiller DDC Top
    2x256 GB SanDisk SataIII SSD || FrozenQ Fusion V Reservoir

  11. #11
    Registered
    Join Date
    Sep 2007
    Quote Originally Posted by Blazing fire View Post
    You're saying push/pull is worse than pull only? . According to martin
    Unfortunately that is what I said..that is the problem with a lack of good proofreading. I meant to say push/push and pull/pull, and somehow between thinking and typing that got shorten to push/pull. In seeing the push/pull comment I stopped.

    I am glad you caught that before anyone took that advice. I agree with you (and martin) that push/pull is better than just one fan in either configuration.

  12. #12
    Ah I see!

  13. #13
    Wants Old Title Back
    Didn't Get It
    Conumdrum's Avatar
    Join Date
    Sep 2007
    Location
    Las Vegas
    Author Profile
    With those 100CFM fans you won't even need a shroud. Just put them on and go!
    I want my old title back.
    Old beast is torn down.
    Will update later.

    900 watt (1500VA) UPS
    27" ASUS VG 3D/Nvidia V2 3D glasses and 24" Acer H243H

  14. #14
    Member Gillbot's Avatar
    10 Year Badge
    Join Date
    Sep 2001
    Location
    East Palestine, OH
    Heatware Profile
    Quote Originally Posted by Conumdrum View Post
    With those 100CFM fans you won't even need a shroud. Just put them on and go!
    Not all "100cfm" fans are created equal. Many of the lower cost, higher rated flow fans don't work well when they need to move air through a restriction such as a radiator.

  15. #15
    Thanks, Gillbot, I will keep that in mind! the fans I'm using were pretty cheap, so maybe I will buy new fans anyway...
    /////Intel i5 3570K @ 4.5Ghz || XSPC Raystorm
    Sapphire R9 290X @ 1175/1625 || EK Fullcover Waterblock
    ASUS TUF Sabertooth Z77 Mobo || XSPC AX360 Radiator
    24GB DDR3 1600 Crucial Memory|| XSPC AX240 Radiator
    /////////////Corsair hx1000w || MCP355 w/Heatkiller DDC Top
    2x256 GB SanDisk SataIII SSD || FrozenQ Fusion V Reservoir

  16. #16
    Member
    Join Date
    Jun 2008
    Location
    Miami, FL
    Quote Originally Posted by axis01 View Post
    They sound like this .................

    They are very quiet but it depends on your reference. I think they are rated at 33db which isn't bad at all. For the price of 3 yate loons, you can add a Sunbeam 4 channel fan controller and still come out cheaper than 3x of most other fans alone.

    Axis

    I just bought 10 of these for my rads and let me tell you, they are SWEET!!!

    I can hardly hear them and they are outside the case.

  17. #17
    Unoriginal Macho Moderator nikhsub1's Avatar
    10 Year Badge
    Join Date
    Oct 2001
    Location
    Los Angeles
    Quote Originally Posted by Gillbot View Post
    Not all "100cfm" fans are created equal. Many of the lower cost, higher rated flow fans don't work well when they need to move air through a restriction such as a radiator.
    Exactly. If they are the san ace fans, they are the real deal. All too often though, you get mfgrs. claiming 100CFM @ 28dBa to which I say, #@!@ ##$%!
    Loading Signature ...

  18. #18

    Join Date
    Dec 2001
    Location
    Canuckistan
    From what i've always been told, not just with water cooling PCs, but with any fan/rad, always pull instead of push. When you push air against a rad, the air itself adds more resistance. (Ok, thats just my theory, but it makes sense at a molecular level! ). In practice, there probably isnt a big difference between push and pull, obviously push and pull is going to be better, as you have more static pressure.

    Which i'll make my last point. CFM is the LAST thing you should be worried about. CFM ratings of fans, like the GPH rating of pumps, is with 0 resistance. If you buy cheap 100cfm, i guarantee you will never see 100cfm out of that fan. The rating that matters most, is the Static Pressure.

    *Hugs his san aces*
    Multi VM/SMP Folding Guide | Ram Timing Guide | Folding working on Alzheimer's cure
    GPU Countdown to new years - Fold for a cure!
    Asus M3A79-T ~ Phenom 9850 ~ Cell Shock DDR-1066 ~ HIS HD4850
    Phenom 9850 Rank : PiFast (1st) | wPrime32 (1st) | wPrime1024 (1st) | SPi1M (1st) | SPi32M (2nd)

  19. #19
    Unoriginal Macho Moderator nikhsub1's Avatar
    10 Year Badge
    Join Date
    Oct 2001
    Location
    Los Angeles
    Cluster, push has proven to work a bit better... maybe 2% or so, nothing major but still better.
    Loading Signature ...

  20. #20
    Registered
    Join Date
    Feb 2007
    those SAN ACE's are around £19 - are they really worth that over some £4 yate loons??

Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •