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post #11 of 25
Quote:
Originally Posted by DredFX View Post

But won't that allow dust and dirt to get into the fan more easily? :/

Only if you have it sitting on carpet or something. You can also get filters that will protect from the outside, although with that case.. you may have to put one inside....

http://www.frozencpu.com/cat/l2/g47/c223/list/p1/Fan_Accessories-Fan_Filters.html
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post #12 of 25
If you want keep dust to a minimum, you need dustfilters on the places where your intake fans are and you need more air going in than going out (positive pressure)

it looks like you have more output fans (combined with the output through your PSU) than intake fans, so that's not good if that's correct.
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post #13 of 25
A little off topic, but the whole Positive pressure vs Negative pressure thing is debatable...

http://www.techspot.com/community/topics/effective-air-cooling-guide-part-ii-myths-old-rituals-and-analysis.180883/
Negative / Positive Pressure (Click to show)

Quote from the Link above:

Positive Case Pressure​
Often said to be better than negative case pressure in terms of dust accumulation and cooling, positive case pressure does have its cons, too.
Pros:
· Slower dust accumulation when intakes filtered: Air may actually be leaking out through gaps. Atmospheric dust cannot go against airflow, so it is kept out.
· Effective in the short term: The cool air (comparatively) being blown in successfully keeps temperatures down for some time after start-up. But:
Cons:
· Severely inefficient in the long run: More air is going in than out. So air isn’t vacated fast enough. That is, it stays inside near the heated components longer, and absorbs more heat, but in the process heats up other components as it passes over them on its way out. In tight, enclosed, or obstructed spaces, such as between RAM sticks, drives, GPU’s and particularly the top-front section of the case, hot air-pockets are formed when a system operates for longer periods of time, making matters worse. Though good airflow and cable management can significant reduce this, it cannot fully eliminate it.


Negative Case Pressure​
This may seem like being a devil’s advocate, but negative case pressure, I’ve observed, has often been demonised. To justify my statement, here’s a look at its pros and cons:
Pros:
· Lower temperature-time graph curve: And by that I mean a slower rise in temperatures over extended operational time. After 30 minutes of IntelBurnTest with positive case pressure, CPU temperature rose from 46°C to 57°C. With the same test profile, but negative pressure, temperatures rose from 39~40°C to 46~47°C in 30 minutes. That’s a 10°C drop in the max temps, and a 6.5°C drop in idle temps. Impressed, I let it go on for another 30 minutes, and only saw a rise to 47~48°C. So by that pattern it might as well be a reduction in the max. temperature “wall”. IntelBurnTest is very intensive, so I couldn’t provide any screenshots, sorry. And the temperatures fell very rapidly once the test was over.
· No* hot air-pockets inside: The partial vacuum left behind by the air which is vacated from the case can’t be filled fast enough by the filtered intakes (*depends on CFM) and air from other gaps. To fill it, the remaining air from all around the case begins moving into its place, with it eliminating all air-pockets. This air, if the fans are appropriately placed, the cool air gets quickly vacated from the case, absorbing heat from other parts on its way, and the cycle continues.
Cons(?):
· Accelerated Dust Accumulation: Not that I noticed it in my test setup, but many report negative case pressure to increase the rate at which dust accumulates. Thus, a case with negative pressure needs to be cleaned more often than one with positive pressure. However, I personally find this quite baseless. For significantly more dust to build up, it would require significant gaps, like unoccupied fan mounts, open expansion covers and drive bezels, etc., which is rarely the case.


some good info in general: http://www.bit-tech.net/hardware/2012/02/10/the-big-cooling-investigation/1

Edited by cgipson1 - 3/20/14 at 1:16pm
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post #14 of 25
Thread Starter 
My computer is on a desk. It gathers a bit of dust not tantalising amounts of it. I only ever need to dust out my computer every six months or so. Still good to flip the PSU over?
post #15 of 25
Quote:
Originally Posted by DredFX View Post

My computer is on a desk. It gathers a bit of dust not tantalising amounts of it. I only ever need to dust out my computer every six months or so. Still good to flip the PSU over?

Yep! Highly recommended!
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post #16 of 25
Quote:
Originally Posted by cgipson1 View Post

A little off topic, but the whole Positive pressure vs Negative pressure thing is debatable...

http://www.techspot.com/community/topics/effective-air-cooling-guide-part-ii-myths-old-rituals-and-analysis.180883/
Warning: Spoiler! (Click to show)
Quote from the Link above:

Positive Case Pressure​
Often said to be better than negative case pressure in terms of dust accumulation and cooling, positive case pressure does have its cons, too.
Pros:
· Slower dust accumulation when intakes filtered: Air may actually be leaking out through gaps. Atmospheric dust cannot go against airflow, so it is kept out.
· Effective in the short term: The cool air (comparatively) being blown in successfully keeps temperatures down for some time after start-up. But:
Cons:
· Severely inefficient in the long run: More air is going in than out. So air isn’t vacated fast enough. That is, it stays inside near the heated components longer, and absorbs more heat, but in the process heats up other components as it passes over them on its way out. In tight, enclosed, or obstructed spaces, such as between RAM sticks, drives, GPU’s and particularly the top-front section of the case, hot air-pockets are formed when a system operates for longer periods of time, making matters worse. Though good airflow and cable management can significant reduce this, it cannot fully eliminate it.


Negative Case Pressure​
This may seem like being a devil’s advocate, but negative case pressure, I’ve observed, has often been demonised. To justify my statement, here’s a look at its pros and cons:
Pros:
· Lower temperature-time graph curve: And by that I mean a slower rise in temperatures over extended operational time. After 30 minutes of IntelBurnTest with positive case pressure, CPU temperature rose from 46°C to 57°C. With the same test profile, but negative pressure, temperatures rose from 39~40°C to 46~47°C in 30 minutes. That’s a 10°C drop in the max temps, and a 6.5°C drop in idle temps. Impressed, I let it go on for another 30 minutes, and only saw a rise to 47~48°C. So by that pattern it might as well be a reduction in the max. temperature “wall”. IntelBurnTest is very intensive, so I couldn’t provide any screenshots, sorry. And the temperatures fell very rapidly once the test was over.
· No* hot air-pockets inside: The partial vacuum left behind by the air which is vacated from the case can’t be filled fast enough by the filtered intakes (*depends on CFM) and air from other gaps. To fill it, the remaining air from all around the case begins moving into its place, with it eliminating all air-pockets. This air, if the fans are appropriately placed, the cool air gets quickly vacated from the case, absorbing heat from other parts on its way, and the cycle continues.
Cons(?):
· Accelerated Dust Accumulation: Not that I noticed it in my test setup, but many report negative case pressure to increase the rate at which dust accumulates. Thus, a case with negative pressure needs to be cleaned more often than one with positive pressure. However, I personally find this quite baseless. For significantly more dust to build up, it would require significant gaps, like unoccupied fan mounts, open expansion covers and drive bezels, etc., which is rarely the case.


some good info in general: http://www.bit-tech.net/hardware/2012/02/10/the-big-cooling-investigation/1


imo this also depends on the airflow that is created inside the case and the design of the case

also a nice article about pos pressure: http://www.silverstonetek.com/techtalk_cont.php?tid=wh_positive&area=usa
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post #17 of 25
Quote:
Originally Posted by TiezZ BE View Post

imo this also depends on the airflow that is created inside the case and the design of the case

also a nice article about pos pressure: http://www.silverstonetek.com/techtalk_cont.php?tid=wh_positive&area=usa

Agreed... it is a sometimes volatile topic... with pros and cons to both...
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post #18 of 25
Thread Starter 
Hi guys. Got everything working, Moved card to the other slot and flipped the PSU over. PSU is now remarkably cooler and GPU performs pretty well. But, I am having one issue.

CPU is a bit hotter in general than it should be. i5 3570k is hitting 35-40 Celsius idle, while it hits 75-80 when playing demanding games such as Far Cry 3. On one occasion, it even hit 85 degrees. While these aren't particularly dangerous temps, they're still roughly 5 degrees hotter than usual. GPU temps are perfectly fine. Everything is monitored using HWMonitor.

Never moved the CPU fan or heatsink, nor are there any wires blocking it. No idea what could be wrong.

Rig case is a BitFenix Merc Beta. Dusted my entire machine out as little as three months ago. Any ideas what could be wrong?
Edited by DredFX - 3/21/14 at 3:03am
post #19 of 25
noticed from the photos it's a stock cooler

stock coolers do an average job at best

could try reseating the cooler with a fresh TIM application, but for better cooling you might want to look at an alternative heatsink
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post #20 of 25
Thread Starter 
Only had the CPU since October. The paste couldn't have degraded this quickly, surely?
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