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[ROG] Positive vs Negative Pressure - Page 2

post #11 of 44
I have more fans as intake than I do exhaust so I guess that means I have a positive pressure setup. I have 4 fans intake, 3 fans exhaust including the push pull on my H80.

But really what makes the biggest difference in my case is the loose fans I have taped to the side of the interior of the case directing air towards the CPU area, and the fan I will soon have directing air towards the crossfire setup.

It shouldn't surprise anyone that directed airflow would make the biggest difference, like having side cover fans as intake blowing directly on the GPU area.
Edited by james_ant - 3/19/12 at 11:07am
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post #12 of 44
Mine is all positive pressure. Especially on X79 that I need ventilation over the VRM.
 
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post #13 of 44
Well I replaced my h70 with a phanteks ph-tc14e, but I think I am still going to give it a shot. I appreciate the response. It seems logical after reading the article and thinking about it. One big wave of air coming in from the top and being blown backwards due to the front intake. Seems great. One of my top fans is definitely going to be blowing right on top of my new cooler, while the other one might barely escape it.
post #14 of 44
Quote:
Originally Posted by guyladouche View Post

I nerd-rage every time I hear or see the phrase "negative pressure." I know what they are implying, but I also feel like if you're going to make a scientific-method assessment dealing with pressures, you really should be accustomed to discussing them as gradients or differentials. There is no such thing as "negative pressure" as a physical quantity. Sorry for my nerd-rage.

Actually there is such a thing as negative pressure when you are talking in terms of the gauge pressure (where atmospheric pressure is 0).

If you were talking about absolute pressure then yes; there can't be a negative one.
Edited by jpye11 - 3/21/12 at 6:16am
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post #15 of 44
Native positive pressure is one of the main reasons I love my case.
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post #16 of 44
Quote:
Originally Posted by rdasch3 View Post

Well I replaced my h70 with a phanteks ph-tc14e, but I think I am still going to give it a shot. I appreciate the response. It seems logical after reading the article and thinking about it. One big wave of air coming in from the top and being blown backwards due to the front intake. Seems great. One of my top fans is definitely going to be blowing right on top of my new cooler, while the other one might barely escape it.

NP, bro. Give it a shot and let us know how it works out.
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post #17 of 44
Cool.

I have positive pressure on near-silent environment.

If I crank up the radiator fans to their maximum, pressure becomes substantially negative, and noise reaches unbearable levels.

Nice to see it explained... once more.
   
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post #18 of 44
One thing I learned from that was I want a Maximus V Gene and the H50 sucks.
post #19 of 44
4.7 18 hour run stable.png 2409k .png file

Alright, well it was the first thing I did when I got home and there is at least a 2 degree drop in both cpu and gpu with decent ambient temp (thank you air conditioner). Its that time of year when my room gets hot.

My bottom video card dropped in temp as did my top one. lowest cpu cores are now 32 29 33 29, where most of them did hang around 34, 35 or 36, before switching my fan direction. Good stuff. My only exhaust is the fan on the back of my case, with the cpu cooler pushing air towards it with dual 140's. The free temp drops is cool. I will have to find time to stress it and see where it goes now.

As you can see in the screenshot, my h70 with prime got 2 cores at 85. I was a little off with the idles. I think I had my air conditioner on full blast at that point. Either way, the h70 did horrible compared to this.
Edited by rdasch3 - 3/19/12 at 4:39pm
post #20 of 44
Quote:
Originally Posted by guyladouche View Post

I nerd-rage every time I hear or see the phrase "negative pressure." I know what they are implying, but I also feel like if you're going to make a scientific-method assessment dealing with pressures, you really should be accustomed to discussing them as gradients or differentials. There is no such thing as "negative pressure" as a physical quantity. Sorry for my nerd-rage.
The one thing that always disappoints me with temperature studies is that no one ever states the ambient temperature(s) at the time of measurements. I can say that there's a good 3-8C temperature differential at my work offices depending on where the AC cycle is at. It really lends a lot of uncertainty/error to temperature reporting across a series of hours or days during testing.

I agree about the blatant misuse of the term negative pressure. They should call it a negative pressure anomaly, with the anomaly being relative to the ambient room pressure.
Negative pressure does exists as it is a property of dark energy, but of course this type of negative pressure has no place in these sorts of debates.
 
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