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[Official] Corsair Obsidian 900D/800D/750D/700D/650D/550D/450D/350D/250D Club - Page 253

post #2521 of 8654
My top rad is intake and the bottom rad is exhaust, the rear 140 and the two new 140 fans I added to the modded hot swap bay system are doing intake duty. Im going to try to switch the top fans and bottom ones and see what happens. So far, the added 240 rad at the bottom I have seen a good 5c drop on my gpu under load.

btw, I also have two side 120(s) on the bottom corners of the doors for intake to help the bottom 240 rad.
post #2522 of 8654
Quote:
Originally Posted by CorsairGeorge View Post
You'd be surprised what the differences are between popular notions of airflow and the actual airflow.

As an example, we tested a lot of fans for our new H60 for static pressure - a lot of popular fans from all kinds of brands you see on forums all the time.

We found that some of the ones considered "best" for radiators were actually pretty crappy, no matter how cool they looked. Turns out there's a pretty good reason that most fans in the 1000-2000 RPM range are shaped fairly similarly - drastic changes increase noise and tend to actually decrease airflow and/or static pressure.

So the new fan on the H60 doesn't look that different - but the small changes (different pitch and size on the fan blades, different housing shape, different motor) make a big difference in performance, even if it looks almost the same.

And a lot of the really cool looking cases with tons of fans all over the place end up just adding noise to a system instead of channeling air through the system.

For those concerned with "heat rises", it really doesn't have much effect in something as small as a computer case. Especially with airflow which can easily overcome the natural physics of rising heat. The most important thing is to have cool air blowing over your hottest components, regardless of whether they're upside down, right side up, whatever.
So due to where I placed my H70 do you think that I should just flip the 140mm exhaust into an intake and keep the top 120mm's as exhaust? I mean the cool air should hit my huge north bridge and feed to the H70 with the help of the bottom 140mm intake no?
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Desoulate
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post #2523 of 8654
Quote:
Originally Posted by jamesschmidt82 View Post
So due to where I placed my H70 do you think that I should just flip the 140mm exhaust into an intake and keep the top 120mm's as exhaust? I mean the cool air should hit my huge north bridge and feed to the H70 with the help of the bottom 140mm intake no?
For lower CPU temps, the H70 should always be the intake. For GPU temps, it's a bit more of a trial and error thing. I've gone a single 5870 in my system and it runs cooler with the three top fans as intakes and the single exhaust fan in the rear. A co-worker has dual 480s and claims he gets better temps with the rear as an intake and the top three as exhausts.

The trial and error of it is the fun part.
post #2524 of 8654
Quote:
Originally Posted by CorsairGeorge View Post
You'd be surprised what the differences are between popular notions of airflow and the actual airflow.

As an example, we tested a lot of fans for our new H60 for static pressure - a lot of popular fans from all kinds of brands you see on forums all the time.

We found that some of the ones considered "best" for radiators were actually pretty crappy, no matter how cool they looked. Turns out there's a pretty good reason that most fans in the 1000-2000 RPM range are shaped fairly similarly - drastic changes increase noise and tend to actually decrease airflow and/or static pressure.

So the new fan on the H60 doesn't look that different - but the small changes (different pitch and size on the fan blades, different housing shape, different motor) make a big difference in performance, even if it looks almost the same.

And a lot of the really cool looking cases with tons of fans all over the place end up just adding noise to a system instead of channeling air through the system.

For those concerned with "heat rises", it really doesn't have much effect in something as small as a computer case. Especially with airflow which can easily overcome the natural physics of rising heat. The most important thing is to have cool air blowing over your hottest components, regardless of whether they're upside down, right side up, whatever.
good info corsairgeorge, +rep

mind elaborating on this? which fans are you referring to?

Quote:
We found that some of the ones considered "best" for radiators were actually pretty crappy
post #2525 of 8654
Quote:
Originally Posted by CorsairGeorge View Post
For lower CPU temps, the H70 should always be the intake. For GPU temps, it's a bit more of a trial and error thing. I've gone a single 5870 in my system and it runs cooler with the three top fans as intakes and the single exhaust fan in the rear. A co-worker has dual 480s and claims he gets better temps with the rear as an intake and the top three as exhausts.

The trial and error of it is the fun part.
Thanks for taken the time to respond. Guess I will stick with my original plan because I don't want to move the H70 if I don't have to and just see what happens! If I can not meet my needs temp wise looks like its time to scare the piss out of myself all over again and remove the H70 clean everything and readjust lol. Thanks again!
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post #2526 of 8654
Quote:
Originally Posted by koven View Post
good info corsairgeorge, +rep

mind elaborating on this? which fans are you referring to?
I'd love to, but I'm not going to badmouth competitors out there.

It really is weird what you get when you do real wind tunnel testing on various fans. If you think about it, we're still in the infancy stage when it comes to case and cooling stuff. Right now, if you find a fan you like, you go out there and buy it for all your fan spots in your case.

But that doesn't make sense necessarily - fans that are good at one thing aren't always good at another. For example, push-pull on radiators. Push fans need high static pressure, but pull fans don't, they just need high airflow (provided the exhaust port on the case is relatively unobstructed). So your push and pull fans shouldn't necessarily be the same.

Like high-end sports cars - they have different size tires in front and rear - and sometimes these tires are directional, too, so you have to make sure they're installed right.
post #2527 of 8654
Quote:
Originally Posted by Diplo View Post
hello guys, i scratched my top with the radiator screws.

any idea to fix this? some spray painting or so?
Just get some cheap masking washers from a hardware store and paint it black.




Attachment 194889Attachment 194890

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post #2528 of 8654
^^
Looks nice...Good Job!!
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post #2529 of 8654
or

a more expensive route, add a fan shroud, serves you two purposes, adding fans on top (for a push/pull config and to leave some room inside) and cover up the scratch

post #2530 of 8654
Quote:
Originally Posted by McDown View Post
Just get some cheap masking washers from a hardware store and paint it black.
Fantastic idea! I'll have to get some, paint em up flat black or something.
    
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