650D - dusty case!

OptimaLnrg said:
Edit: I like to stick to the 'hot air rises' way of doing things, hence the above. I think corsair say to use the h100/i as intake which is BS imo as by using an AIO you are already removing airflow from the other components on the motherboard and now they are basically saying 'bathe it in warm air' in order to get the best CPU temps.
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Incredible. Despite Corsair releasing a video showing people how best to ventilate a Corsair 650D with a Corsair H100 fitted, you are calling this BS ? Who are you to say the manufaturer's official video of their own products is BS ? Epic arrogance and ignorance !

I have a 650D with a H100 fitted as they suggest in the video, and fan filters fitted at the top intakes and I have great temps and no dust in my case after over 6 months use.

As for the "hot air rises" rubbish. Yes, it does, in a STILL environment :rolleyes:. What you fail to realise though, in a PC case with multiple fans blowing, the air does NOT have time to rise or do anything else for that matter, except follow the direction of least resistance. The exhaust !

I guess i'm talking BS too though huh ?
 
Be nice Sliver! :)

But I see what you mean. Taking a water cooling analogy - the order of component blocks in a loop is said to not matter as heat becomes distributed and normalised throughout the loop anyway. So maybe the same applies in air.

Maybe the balance of intake vs exhaust and hence the pressure is more important than where exactly each point is located. As long as you have constant circulation and an effective pressure balance heat will get forced out and replaced with cool air. The argument of the top being intake vs exhaust simply becomes important due to the fact it involves radiator heat but is that really any significant amount of heat for the amount of circulation in play. Given that the heat doesn't really linger.

The silverstone fog test positive pressure demo videos are great point of reference. The one below demonstrates what happens with front and top being intake with rear exhaust and then they show the same test with the rear fan removed altogether and the outcome is the same. Based on this video one could say, actually, that hot air gets almost no scope to rise - it appears simply to follow the pressure. Just observations.

http://www.youtube.com/user/Silverstonetech?feature=watch

But to be fair OptimaLnrg isn't the only to make the arguments that he did. It is a widely held view and when I have asked such questions in the past I've received an equal amount of opposing answers.
 
Toys, pram, thrown.

More filtered intakes than exhausts = less dust, we agree.

I said it's better achieved by using the rear fan as an intake, so that you won't be blowing warm air from the h100 on the mosfet heatsinks etc on the motherboard. Hardly holding up 'hot air rises' as if it's some kind of gospel. I just work out my airflow using it as a factor.

If corsair wanted you to intake in the 650d roof they would included fan filters at the point of manufacture. They only suggest it now because every little degree counts when you're trying to sell these AIO watercooling things. Users with non-ref gpus mounting the h100i in exhuast config might flip a lid when they realise they aren't getting the review temps.
 
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I've got the h100i mounted at the top as an intake, with a custom demciflex filter. The only exhaust I have is one high speed/silent 120mm fan at the rear of the case.
 
Monkeyspaz5000 said:
Will do
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I use this kit on my 650D: http://www.overclockers.co.uk/showproduct.php?prodid=CM-029-DF

It's for the 600T so i ditched the top filter and the side filter and was left with the front filter, PSU filter and the rear 120mm (which i use on a 5.25 HDD drive bay that has an intake fan).

I have no dust problems with my case other than the mass that builds up on the filters every couple of weeks. I have 2 x 120mm pushing air out the top and a 120mm pushing out the back and the 200mm intaking at the front.

It aint cheap, but its definitely worth it for the dust it stops getting in the case especially useful as i'm using water cooling radiators.
 
p.s i also removed the filter mesh out of the pop out dust filter on the front of the case also removed the PSU sliding dust filter as i did want too much resistance as demci filters do reduce airflow a fair amount.
 
I bought 4 Decmiflex filters and they work amazing!

Been using them for a week now and I can see dust collected on the filters already. My PC is dust free so far. Very happy with them:D
 
OptimaLnrg said:
you have more air being forced out via the fans than you have being forced in.

this renders the fan filter on the front of the case useless. the slight negative pressure means unfiltered air full of dust will be drawn in the various cracks etc to equalise the pressure
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You were 100% spot on with this.

I opened the case yesterday to replace the PSU and you could see where dust has been getting sucked into the case etc where dust shouldn't be.

Defo going to look at sorting this.
 
Monkeyspaz5000 said:
This should do the job fine for the rear fan surely? If I flip it to an intake.

YOUR BASKET
1 x Silverstone 120mm Magentic Fan Filter in Black £3.98
Total : £6.26 (includes shipping : £1.90).

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I've got that on the back of my 650D. Stock filter on the front 200mm, and nothing on the top filter wise (280mm rad at top using 2 x 120mm fans push). Darn dust still gets into the case. It can be seen accumulating around the bottom (by the PSU) and also on top of the graphics card.

Think them boys talking about pressure are correct! - I've used both push and pull on the rear 120mm and its the same effect more or less.

However - I will never agree with anyone who thinks its a good idea to push heat from a rad into a case :p :D :p
 
I'm bumping this thread in hope that somebody has found a solution to the dusty 650D!

I am using my fans as installed when I got the case - top and rear out and the front as the only intake.
 
If you're worried about hot air in your case see if you can mount the psu upside down so it draws air from the case through its fan and then blows it out the back. In your setup I'd have the front and top set to draw air in and the rear exhaust. With the psu also exhausting you will still have positive pressure and cycle plenty of fresh air.
 
Sliver said:
The mesh on the 650D fan filters is quite fine, so should be stopping the dust.
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It doesn't stop the dust, far from it. On my 650D i did the front mod to remove the honeycomb mesh that caused noise when the fan was sucking air through it. Over the top of the mod i placed a Demciflex custom made 210mm front filter, you wouldn't believe the amount of dust that gets past the front Corsair filter and is then caught by the Demciflex filter, the dust is that thick you can write your name in it. Its great tho that the Demciflex one is doing a good job.
 
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