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Lian Li PC 60 Plus II + Zalman CNPS 9700 Fan direction question

U

UberXenon

Junior Member
(No love at the Hard forums, so I'm trying here)

I finally got around to replacing my stock Intel HSF with a Zalman CNPS 9700 for my Q9300 (no overclock). This will be going in a Lian Li PC 60 Plus II case. But, I have a question:

The directions on the Zalman website show that the HSF should be pointed so that the air blows toward your rear exhaust fan, thereby sucking the hot air out of the case (Go here then click "How to Install"). However, the rear case fan on my PC 60 Plus II is an intake fan, not an exhaust fan. (See the bottom of this page for airflow diagram.) So, I guess I have a few options:

  1. Aim the Zalman in the reverse direction of what their directions say so that it is pointing the same direction as the intake fan, i.e. sucking cool air from outside into the case and through the Zalman.[/li]
  2. Aim the Zalman toward the rear case fan, like their directions say, and flip the rear case fan so that it becomes an exhaust fan. I hesitate to do this tho because I want to place some amount of faith in Lian Li's thermal design, and flipping this fan may result in too much negative pressure inside the case (?)[/li]
  3. Same as (2), but also flip the 120mm exhaust fan above the video card so that becomes an intake fan. Rationale: Flipping both an intake and an exhaust fan would help keep the pressure more normalized, and also this keeps all the intake fans at the bottom of the case and all the exhaust fans at the top of the case, which makes sense since warm air rises.[/li]
  4. Other?[/li]

Anyway, let me know your thoughts. I realize that I'm probably making this into a bigger issue than it really is, especially considering that I'm not overclocking, but I'd like to get good airflow without a lot of trial-and-error, if I can.

Thanks! 🙂
 
I'd go with option 2. As long as the front fans are blowing in, you should be fine. What kind of fans are you using? The stock ones that came with the case? You can mess with higher-quality fans and adjust their speed with inline resistors. Fan noise really matters to me. Other people don't care too much about it. So I always try to adjust the fan speeds as low as possible and still maintain an acceptable CPU and case temp. Also take into account the room in which the computer will be running... Do you have A/C? How warm does it get in the summer?
 
Sorry, no love here either, try our love and relationships forum!😀
Is that fan on the back an 80mm? Is there room to enlarge that hole? No matter what, that should be an exhaust but any amount that can be enlarged will help. (front and side intake, top, rear exhaust)

edit- welcome to the forums!
 
Thanks guys. From your advice I think I'm going to go with option 3. That just seems to make the most sense. Don't really want to Dremel my case right now to enlarge that hole, tho 😛

Now I just have to figure out if I want to replace stock fans with something quieter and/or more CFM.

Thanks!
 
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