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Fractal Design S - best static pressure fan? Noctua - Thermalright - Phantek? please help - Page 7

post #61 of 109
Quote:
Originally Posted by ciarlatano View Post

Not necessarily. A fan's static pressure on output does not always directly correlate to ability to draw air. In fact, some fans noted for their high static pressure are notoriously bad at their ability to draw air through any type of restriction.

Static pressure is rated on the exhaust of the fan only.

Thanks for the clarification. Don't need any misinformation being spread wink.gif
Edited by compy532 - 10/30/15 at 9:03pm
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Eversor v2.0
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post #62 of 109
Thread Starter 



work done thumb.gif

removed bottom and rear grill
removed "missing" second grill (closed back at define S)

didn't remove 2nd vent bottom because my PSU is fan less (SilverStone Nightjar 520W)

quite satisfied with my work thumbsupsmiley.png
Edited by tehelelol - 10/31/15 at 5:03am
post #63 of 109
Static pressure has no reference to or can any be implied to how well the fan pulls versus pushes air. Static pressure is only the pressure the fan reaches when it stops moving air . It is the pressure differential between fan intake and fan exhaust, obviously this is measured on the higher pressure (exhaust side). If we were measuring on the front of fan it wold be a minus number. biggrin.gif
Quote:
Originally Posted by tehelelol View Post

[ Warning: Spoiler! (Click to show) work done thumb.gif

removed bottom and rear grill
removed "missing" second grill (closed back at define S)

didn't remove 2nd vent bottom because my PSU is fan less (SilverStone Nightjar 520W)
quite satisfied with my work thumbsupsmiley.png
Looks good. thumb.gif

Removing the PSU grill helps just as much as removing other grills. Lower fan speeds have much lower ability to overcome resistance of things like grills and filters. wink.gif
post #64 of 109
Thread Starter 
Quote:
Originally Posted by doyll View Post

Static pressure has no reference to or can any be implied to how well the fan pulls versus pushes air. Static pressure is only the pressure the fan reaches when it stops moving air . It is the pressure differential between fan intake and fan exhaust, obviously this is measured on the higher pressure (exhaust side). If we were measuring on the front of fan it wold be a minus number. biggrin.gif
Looks good. thumb.gif

Removing the PSU grill helps just as much as removing other grills. Lower fan speeds have much lower ability to overcome resistance of things like grills and filters. wink.gif

thanks for feedback tongue.gif
My PSU is passive cooled so no fan inside that's why I thought it's not necessary to remove the PSU bottom grill?
Am I wrong?
post #65 of 109
Quote:
Originally Posted by tehelelol View Post

thanks for feedback tongue.gif
My PSU is passive cooled so no fan inside that's why I thought it's not necessary to remove the PSU bottom grill?
Am I wrong?
Grill is resistance to airlfow .. with or without a fan. Your choice.
post #66 of 109
Quote:
Originally Posted by doyll View Post

Grill is resistance to airlfow .. with or without a fan. Your choice.

ya.. but that would be an insane amount of radiant heat to cause enough airflow that a gill is restricting it.

In any event, his Define can be be called a "Define S Pro" model now thumb.gif
post #67 of 109
Not really. Grills disrupt airflow and create turbulence .. and that lowers the overall flow rate. Not saying it making a huge difference, but when removing grills from bottom of a case it is only logical to remove both the PSU and component area vent grills, not just one.

As an example::
  • 2-5c drops in temps by removing vented PCIe slot covers
  • Case with no rear fans, remove grill on vent and get 3-7c better cooling.
  • Remove I / O plate from back of mobo with 2-7c lower VRM & mobo components.
All with no other changes.

I have not monitored PSU temp changes as my PSUs have no sensors and I haven't bothered adding any.
post #68 of 109
Quote:
Originally Posted by doyll View Post

Not really. Grills disrupt airflow and create turbulence .. and that lowers the overall flow rate. Not saying it making a huge difference, but when removing grills from bottom of a case it is only logical to remove both the PSU and component area vent grills, not just one.

As an example::
  • 2-5c drops in temps by removing vented PCIe slot covers
  • Case with no rear fans, remove grill on vent and get 3-7c better cooling.
  • Remove I / O plate from back of mobo with 2-7c lower VRM & mobo components.
All with no other changes.

I have not monitored PSU temp changes as my PSUs have no sensors and I haven't bothered adding any.

Sure, thats on a psu with a fan, his psu has no fan. There is not that much airflow from the radiant heat
post #69 of 109
Quote:
Originally Posted by BigHotAndLoud View Post

Sure, thats on a psu with a fan, his psu has no fan. There is not that much airflow from the radiant heat
Whatever the amount is, it's needed .. and the fact of the matter .. is .. no grill .. will flow more air .. then .. with grill. poke.gif

biggrin.gif
If I'm removing girls grills from bottom of a case, the PSU girl goes away with other girls grills. tongue.gif

But I'm not going to go to the trouble to just remove a PSU case grill unless I'm removing other grills at same time. . cheers.gif

Would be an interesting test to do sometime. PSU in system at both idle / surfing web and heavy load / gaming with and without grills in PSU and case. One of us would be in for a surprise ending. thumb.gif

Would depend on how much overkill the PSU was .. IE, a 1250w passive cooling PSU running 400w system at full load versus a 500w passivePSU running it. I suspect Idle temps would be similar with or without grills, but at full system load my guess it would be a significant difference, especially on the 500w PSU.
Edited by doyll - 10/31/15 at 10:31am
post #70 of 109
Quote:
Originally Posted by doyll View Post



Would be an interesting test to do sometime. PSU in system at both idle / surfing web and heavy load / gaming with and without grills in PSU and case. One of us would be in for a surprise ending. thumb.gif

Would depend on how much overkill the PSU was .. IE, a 1250w passive cooling PSU running 400w system at full load versus a 500w passivePSU running it. I suspect Idle temps would be similar with or without grills, but at full system load my guess it would be a significant difference, especially on the 500w PSU.

Not really, no surpises, the psu with a fan will improve, and the passively cooled will be the same
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