Obsidian 650D Radiators

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dannyboy2233

dannyboy2233

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Hey guys,
So I'm planning out a water-cooling setup in my 650D. I was planning on a 240mm up top, and a 200mm at the front. However, I've heard talk that it is possible to fit a 240mm rad on the bottom of the case with the removal of the hard drive rack. What I was wondering is this; first of all, is this even possible? And second of all, if it is, how would it work? Because there is no mesh there, so there would be no place for the fans to exhaust; they would have to blow hot air into the case, which would in turn have to be exhausted (correct me if I'm wrong about this), which could perhaps be done by the 20mm fan (since I wouldn't be using it as a radiator if I could fit the 240mm on the bottom).
Thanks so much in advance for your help! :)
 
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ctguy1955
3IKuxKS.jpg
[/quotemsg]

I hope you dont mind, I used your photo to show all of the
bottom right empty space in another thread I started asking
for help with buying the cooling parts.

Thanks

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johnvonmacz

johnvonmacz

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I have a 650D myself with a 280MM RAD at the top and 200MM at the front. Anyway, I don't think it's possible to put the 240MM rad at the bottom with HDD cage removed without doing some modifications on the case.
 
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dannyboy2233

dannyboy2233

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I've heard that 280s don't fit very well in the top. Is that the case (no pun intended, haha), or no? Also, how much modding did you have to do to get that 200mm rad in there?
Thanks!
 
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johnvonmacz

johnvonmacz

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I don't know why but my 280MM RAD fits no problem lol. About the 200MM, I'm talking about the 200M fan in the front not a RAD. :) Anyway Here's a proof of my setup

3IKuxKS.jpg
 
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dannyboy2233

dannyboy2233

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Ahhh, okay. Nice build!
Do you know if it is possible (without modding) to remove the black box which rests the HDD cages when the case first arrives? If so, it would perhaps be possible to have a 240mm rad at the bottom which exhausts heat into the case, which could then perhaps be exhausted by the 200mm fan that is not being used as a radiator... I'm not sure whether that would actually work, though.
 
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johnvonmacz

johnvonmacz

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Thanks! :) Yes it's totally easy to remove, just a couple of screws. About the 240MM rad at the bottom, are you talking about something like this? http://www.techpowerup.com/gallery/3492/__6.jpg
 
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dannyboy2233

dannyboy2233

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Yes!! That is exactly it!! I've been searching for quite a while and I couldn't seem to find a picture, but you've done it! :)
So if I take out the black HDD-cage box on the bottom, I can fit one of those right?
Another minor question; how would you have the fans blow? Would you have the fans on the bottom with the rad on top, blowing hot air into the case which is then exhausted by 200mm, or is there something else that is available to do? Thanks! :)
 
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Buzz247

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Air doesn't make right angle turns - doesn't even use a blinker - ever lol

Looking at it, what you suggest would make sense, but understanding air flow principles (behaves like fluid) this will not work at all. In addition, as Manochalk said in your other thread (http://www.tomshardware.com/answers/id-1739887/bunch-water-cooling-questions.html) dumping the hot air into your case has other consequences that can cause other components to suffer. However, if you want to do it like this, using the bottom rad with fans pulling air in, and top rad with fans pushing air out, front fan feeding cool in, this might work with minimal thermal impact (read as worse temps) There is no one right way, often many, but obviously there is always a best way. Just a matter of deciding what you want vs sacrifice of desire lol Unless you are going for a max OC scenario, I don't think it will massively impact cooling performance, as long as you maintain that upward draft flow to use convection current of heat to your advantage.
 
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dannyboy2233

dannyboy2233

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See, the thing is, I'm still not really sure what fan "orientation" I should put the rads in. I know that on top I should have the fans beneath the rad blowing the hot air out of the case, and the fans beneath the rad on the BOTTOM as well blowing hot air into the case, and then the 200mm fan blowing cold air from the front of the case to the back, and then my 120mm fan exhausting some of that hot air... Would that work at all, or am I completely misunderstanding you?
 
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Buzz247

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Nope that would work. Though for cleaning purposes, that rad fan set you might want to consider putting in pull mode (rad>fan>case exhaust for top, case intake>rad>fan to case interior for bottom) as this will make any dust cleaning easier and keep fans cleaner. Blowing out a rad is actually easier than cleaning fan blades and casing :)

There is no performance difference of push or pull/ Only if you go double fans in a push/pull do you see a difference. So in your case, this boils down to easier maintenance of pull mode.
 
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dannyboy2233

dannyboy2233

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I'm not sure I understand the second part that you are saying... On the top 240mm, have it go "top-of-case -> fans -> rad", with the fans pulling air from the case to exhaust into the air (although this may not work as it would involve blowing hot air onto the rad). However, I don't think I understand what you are saying about the bottom 240mm rad; I can't tell what you want me to do with it, as well as with the 20mm and 120mm fans.
Thank you so much for your help! It's so difficult to find someone who will help with a specific problem, not a general one. :)
 
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Buzz247

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Essentially the bottom is set up reverse of the top by looks. Both are blowing air toward top of case. Heated air, in this scenario, is limited due to maintained high flow in conjunction with natural convection currents, all the while keeping air cooled components fed with moving air. This is the small sacrifice I mentioned earlier. But setting Iit up this way will be best bet for max cooling

Look at the case pic above. Set you bottom rad just like that pulling air thru rad, pushing to top of case. The top rad is going to have a rad, fans pulling air from cas, pushing air out top of case
 
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ctguy1955

ctguy1955

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3IKuxKS.jpg
[/quotemsg]

I hope you dont mind, I used your photo to show all of the
bottom right empty space in another thread I started asking
for help with buying the cooling parts.

Thanks

 
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