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Obsidian 650D Airflow - One Intake?

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April 2, 2012 9:22:43 PM

The components for my new build are trickling in. I've given cooling a lot of thought but my current plans don't feel right to me. Any feedback would be appreciated.

I'll have a Corsair 650D case. Seems like the bottom intake will be cancelled by the PSU exhaust, so let's just put that aside. The only intake I'm currently planning on having is the 200mm fan on the front (yes, I'll probably upgrade the fan itself). I honestly don't understand why people have an intake on the top of the case. Dust obeys gravity and heat rises. For these reasons, I plan on making this an exhaust point (also, maybe I'll float balloons on top of it to entertain my son). I was going to make the upper fan on the back an intake but figured that would mainly just suck in warm air exhausted from the PSU below it, so that will also be an exhaust. That leaves me with the one intake on the front.

Is that enough air?

Some other points: I'll probably have the Corsair H100 cooling my CPU and whatever comes with one of the high-end GeForce cards. I was planning on removing one of the 650D's hard drive cages and moving the other one back a little to give the front fan some room. If anyone has suggestions or information, I would be grateful.

If it makes a difference, here are the specs (starred items have already been purchased):
*Case: Corsair Obsidian 650D ATX mid-Tower
*Motherboard: ASUS Sabertooth X79 LGA 2011 Intel X79
*CPU: Intel Core i7-3930K Sandy Bridge-E 3.2GHz
GPU: EVGA NVIDIA GeForce GTX 580 (Fermi) 3GB (or perhaps the 680)
*Memory: Corsair 64 (8x8) GB Vengeance PC3 12800 1600MHz 240-Pin DDR3
*Boot/App Drive: Crucial 256 GB m4 SATA III 6 Gb/s
*HDD Cache: Crucial 128GB m4 SATA III 6 Gb/s
*Storage Drive: Seagate Barracuda XT 3 TB 7200RPM SATA 6 Gb/s 64MB Cache OEM
(there will almost certainly be another high capacity internal HDD at some point)
*Optical Drive: Samsung Blu-Ray Combo Internal
*Card Reader: Atech Flash Pro-57U USB 3.0 Internal Flash Memory Card Reader
*Power: Corsair Professional Series Gold 1200-Watt 80 Plus Gold
CPU Cooler: Corsair Hydro Series H100 Liquid CPU Cooler
OS: Windows 7 Ultimate SP1 64bit


thank you,
~Steve
April 2, 2012 9:40:20 PM

Wow, nice build you have there :o 

As for the cooling the best way to do it if the case has a side window is let some smoke in while the fans are running (without parts of course, use the PSU trick known as a paperclip). If the smoke quickly leaves the case through the exhaust and clean fresh air is brought in fast, you are doing it well. If smoke lingers in crevices and in the case in general, you might rethink the airflow. A lot of people prefer to have the front fan as an intake, and the top fans and rear fan as exhaust, which is because the cool air is brought in, and then is removed by the exhaust which are most logically placed at the top and rear because heat, well rises. The cooling in this case is more than sufficent, and an H100 will keep your CPU more than cool.
a b ) Power supply
April 2, 2012 10:51:46 PM

I dont think anyone uses that roof 200mm as an intake . As cyansnow mentioned you can check the airflow in your case b4 installing components . Also , if the airflow seems to be lacking I'm pretty sure the 200mm fan locations will accept 2 x 120 mm or 2 x 140 mm fans .. aither way you will have more than enough air . If noise at 12v is an issue theres plenty of fan controllers out there for under $ 40.00 .. good luck with the build it looks great so far
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April 3, 2012 12:54:33 AM

What happened here?!?!?!? I am on an airplane right now. Before closing my laptop for dinner, I could swear there were three different responses to this thread, plus a fourth from me. Those are all gone now. Head-scratch.


rufus_22 and cyansnow - thank you for your input. I feel better about the one main intake fan now. Not sure if I can bring myself to flow smoke through even an empty case, but it sounds interesting.
April 3, 2012 1:38:57 AM

I think he has 2 threads going, 'cause I wrote a few replies, too.

Yes, there are 2: here is the other.
April 3, 2012 3:08:51 AM

Sorry everyone. When I was hitting the Submit button earlier, I was getting errors from tomshardware.com, so I just pushed the Submit button again. Good to hear diverse thoughts though.

At the moment, I think I'm going to stick with the one main intake configuration. I found a post over on the Corsair site where a guy had a diagram of exactly what I'm thinking about. It wasn't very popular with the other posters. They wanted him to make the top fans (which will be the H100 in my case) intake instead of exhaust.

Or maybe I'll buy a decent sized keg-a-rator, mod it so there is some outside airflow and stick the whole PC in that.
!