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Lian-Li PC-Q08 Airflow help

post #1 of 8
Thread Starter 
Any issue with making both of the fans on this case intake and letting the vented holes act as a natural exhaust?

I am thinking of reversing the top fan to push more air directly on to the CPU. Here is the case for reference.

http://www.lian-li.com/v2/en/product...25&ss_index=63
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post #2 of 8
I think the chance of better cooling is about 50-50. Consider this logic: if using the case top fan as intake is natively better, then I suppose Lian Li would have configure that as stock. Since the top case fan is pre-configured as exhaust by Lian Li, this setting should be better, at least for the majority of typical setups. And your setup is quite typical too.

Nonetheless, there is no harm to try and it is as simple as just reversing the fan. And if it does not work out, it is just as simple and easy to reverse back the fan. Furthermore, having both the front fan and top fan as intake would certainly bring the case to a positive pressure state. This is a secondary benefit to keep dust out. However, the primary concern remains whether this would bring better cooling to the CPU.

Lastly, I hope your incoming HD6870 uses the traditional cooling design (ie front-centrifugal-intake-fan-and-rear-exhaust). If not and it dumps heat inside the case, this could be messy, thermally.

Edit 1:
I think the bright side of your idea is that the case will have positive pressure. This means, air will leave the case via the vent holes. This is particular helpful for the case rear. As of now, I suspect hot air exhausted from the PSU into the case rear region is being sucked back in (through the case rear vent holes) into the case by the CPU fan. Obviously this is not desirable. You can check this by placing a tissue/toilet paper over those vent holes to see if air is moving in or moving out. When the case is pressure positive, it will eliminate this non desirable possibility.
Edited by windfire - 10/11/11 at 8:02pm
post #3 of 8
No, that won't work out too well, but anything's worth a try. It's a nice case, I used an Antec Kuhler 620 H20 in a push-pull on a i7-2600 for a friend's build to get some better airflow out. Had to use Scythe Slip Stream Slim SY1212SL12L's.
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post #4 of 8
Thread Starter 
Quote:
Originally Posted by windfire View Post
I think the chance of better cooling is about 50-50. Consider this logic: if using the case top fan as intake is natively better, then I suppose Lian Li would have configure that as stock. Since the top case fan is pre-configured as exhaust by Lian Li, this setting should be better, at least for the majority of typical setups. And your setup is quite typical too.

Nonetheless, there is no harm to try and it is as simple as just reversing the fan. And if it does not work out, it is just as simple and easy to reverse back the fan. Furthermore, having both the front fan and top fan as intake would certainly bring the case to a positive pressure state. This is a secondary benefit to keep dust out. However, the primary concern remains whether this would bring better cooling to the CPU.

Lastly, I hope your incoming HD6870 uses the traditional cooling design (ie front-centrifugal-intake-fan-and-rear-exhaust). If not and it dumps heat inside the case, this could be messy, thermally.

appreciate the analysis. positive pressure was what I was hoping for. one thing I am not sure that Lian Li takes into account is that a standard ATX size PSU will leave very little room for the cpu cooler to grab fresh air... not to mention you can only fit a very small cooler in that space. flipping the top fan changes that, in theory.

as for the 6870, I made it a point to get the reference model cooler specifically for that reason. the issue may be that the card gets starved because of the lack of fresh air on the face side of the fan (down in the case). One option I am considering if temps in the card are poor, is to get a slim fan and place it on the bottom of the case to force some extra air right into the GPU... like this:

http://www.newegg.com/Product/Produc...82E16835103081

I will mock it all up early next week and see what kind of temps I get.
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by El_Capitan View Post
No, that won't work out too well, but anything's worth a try. It's a nice case, I used an Antec Kuhler 620 H20 in a push-pull on a i7-2600 for a friend's build to get some better airflow out. Had to use Scythe Slip Stream Slim SY1212SL12L's.
explanation of why it wont work?
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post #6 of 8
by any chance did you change the directions of any of the fans.. Lian Li has very uncoventional cooling solutions for their cases but it is probably because it is cramped and you are using a High Clocked CPU and GPU.
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post #7 of 8
Just a hunch, all the air is getting pushed in, and there won't be enough strong airflow to force any existing air out the vents. It will just be a slow build-up of contained warm air, and without an outlet, will warm the case overall rather than having it pushed out a plastic (fan blade) exhaust where it won't have time to warm up the case.
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post #8 of 8
Thread Starter 
the bottom portion of the case is vented, as is the rear, and a portion on the left side in front of the PSU fan (there is a gap there, so the PSU is not flush).

the natural flow of air "should" expel any hot air out of the available vents. I am considering putting the case on casters as well, just to create a larger pool of air beneath the case for the GPU to breathe.

I will take some temps before and after once I have the new GPU in place. part of this is from my natural paranoia of electronic failure, but my last card just naturally ran warm and there is no indication so far that the next one is going to do the same.
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