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Cooling an HD4870 & E8400

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That is one kickass looking GPU cooler.

I have some more questions which will undoubtedly make me look like a noob, which is ok, 'cause I am. 🙂

I'm trying to get my head around this airflow concept. With my P5Q standard, my HD470 is sitting pretty muchin the middle of my case with the GPU and video memory facing downward.

In the Antec 900, the power supply sits at the bottom of the case, so I've considered mounting it upside down. (If I mount it right side up, the psu's extraction fan would be of no use, since it's situated underneath.) But considering the ease with which it mounted upside down, I think Antec might even have had this in mind.

Then I have two intake fans in the front. The front panel is divided into 1/3's. currently, the fans occupy the bottom 2/3's.

What I'm considering is having one fan in the top 1/3, pulling air in over the RAM, then CPU, and out through the rear and top.

Then have the other intake fan in the bottom sucking air in over the HR-03 and out through the power supply.

How crazy am I?
 
I think you want both front fans on intake. The big fan on top will pull all that air up and out the top of it. By not having your fans going in one direction on the front, it will screw up the negative flow of the case.
 
Both front fans will be intake. The top one feeding air over the RAM and CPU, The Lower over the HD4870 and HR-03. Hypothetically.
 
yes thats how it works. If you have a cpu cooler like a True Ex or Tuniq, that will also increase your air flow over your card and push the hot air toward the large fan on top while pulling more air through the GPU cooler.
 
The cooler will be below the card though. So the card itself will be between the HR-03 and the CPU cooler. Do you think there'll be enough airflow from the bottom front intake fan over the downward facing HR-03 and out the PSU to use it passively? I'm still hanging for my screen which is why I haven't actually tested these scenarios formyself yet... 🙂
 
If you're using the Antec 900, you'll want the front 120s doing intake (like you proposed) and then you should change the side fan to exhaust if it's over the video card. However, that depends on your situation and you might do better with that as an intake. You should have the CPU cooler blow backwards or upwards depending on where you want the heat to exit the most.
 
Keep the stock 4870 cooler unless you need silence while gaming. (it'll be silent the rest of the time, and it exhausts the hot air directly out of the case)

Get a Xigmatek cooler (Kingwin or OCZ sell them as well), and 1 or 2 case fans and you'll be fine. I have a 3870 with stock cooler, and a Kingwin RVT-12025 on an overclocked E7200. Only case fan I have is a rear 120mm exhaust @ 800rpm, and the power supply helping to exhaust air with its fan at about 700rpm.
 
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