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Noctuas on a Black Ice stealth, high fin density rad - Page 3

post #21 of 28
Two things:

1) sandwiching rads is indeed not necessarily financially smart - you won't lose any cooling power, but your gains will be minimal, so not cost effective

2) in terms of the Noctua: My rig has 3 480 rads, oneof those rads uses Noctua NFP12's (not S12! Those are case fans) and the other two use Gentle Typhoon 1850's.
In terms of sheer cooling power, the GT's move more air, as they obviously turn much quicker. If downvolted to 1280 rpm, roughly what the noctuas have, then I cannot tell a difference in power.

Subjectively, I would say the Noctuas emita much much nicer sound when running @ 1200 than the GT's. The Noctuas create a woosh, the GT's start whining above 800 rpm. So it really depends on what type of a build you have - do you need silence or just pure power? If the latter is the case, get GT's, if not the Noctuas will suit you fine
    
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post #22 of 28
Quote:
Originally Posted by sunnyville View Post
1) sandwiching rads is indeed not necessarily financially smart - you won't lose any cooling power
Actually, you might. Take a look at the numbers skinnee got for the single Swiftech MCR-320 vs. the MCR-320S (double rad sandwich): performance is actually worse for the sandwich below 1800rpm. You really need high air flow to overcome the restriction and take advantage of the extra surface area.
post #23 of 28
Quote:
Originally Posted by subtec View Post
Actually, you might. Take a look at the numbers skinnee got for the single Swiftech MCR-320 vs. the MCR-320S (double rad sandwich): performance is actually worse for the sandwich below 1800rpm. You really need high air flow to overcome the restriction and take advantage of the extra surface area.
The same could be said of using a slow, or poorly designed fan with a high fin density radiator. It's not stacking radiators that becomes the issue in that situation; it's the fan static pressure.

I tried push, pull, and push/pull myself on the RS240 radiators (and 1 QP120) I'm using. The difference with push/pull was that I could run fans at a slower speed, and still have excellent airflow through the radiator, with less noise. If I turned up the fans even more, it just sweetened the deal.

With a higher fin density, it'll really need more static pressure.
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post #24 of 28
Quote:
Originally Posted by RatDog View Post
Skinnee did testing on the Swiftech stack of two 360 rads and showed that it had terrible performance. Once the air passes through the first rad it has absorbed enough heat that it can't really absorb anymore heat from the second rad. You should look at mounting them as single rads not in a sandwich.
well skinee's testing on swiftech rad is stackable rad right? so there isn't a fan in between the rad but it's fan >rad>rad.

but regardless, i wouldn't stack it either way
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post #25 of 28
Quote:
Originally Posted by UnexplodedCow View Post
The same could be said of using a slow, or poorly designed fan with a high fin density radiator. It's not stacking radiators that becomes the issue in that situation; it's the fan static pressure.

I tried push, pull, and push/pull myself on the RS240 radiators (and 1 QP120) I'm using. The difference with push/pull was that I could run fans at a slower speed, and still have excellent airflow through the radiator, with less noise. If I turned up the fans even more, it just sweetened the deal.

With a higher fin density, it'll really need more static pressure.
Well, you're right. When I said "you need high airflow" what I should have said is that you need to run the fans faster to compensate for the extra restriction. That's assuming you're not adding any fans or using thicker/more powerful fans.

Having said that, your comment isn't entirely germane to the discussion. OP gave no indication that he'd be able to use fans in push-pull. Between the choice of:

fan|rad

or

rad|fan|rad

-the latter will perform worse, all things being equal, except at higher fan speeds. Fans in push-pull, thicker fans and/or shrouds will all change the equation, generally in favor of the sandwich.
post #26 of 28
Quote:
Originally Posted by mekaw View Post
well skinee's testing on swiftech rad is stackable rad right? so there isn't a fan in between the rad but it's fan >rad>rad.

but regardless, i wouldn't stack it either way
No, it's rad|fan|rad. See here.
post #27 of 28
Quote:
Originally Posted by subtec View Post
Well, you're right. When I said "you need high airflow" what I should have said is that you need to run the fans faster to compensate for the extra restriction. That's assuming you're not adding any fans or using thicker/more powerful fans.

Having said that, your comment isn't entirely germane to the discussion. OP gave no indication that he'd be able to use fans in push-pull. Between the choice of:

fan|rad

or

rad|fan|rad

-the latter will perform worse, all things being equal, except at higher fan speeds. Fans in push-pull, thicker fans and/or shrouds will all change the equation, generally in favor of the sandwich.
Regardless of relevance in your opinion, the OP did not give any indication, or converse of, their ability to use a push pull setup. I'm merely stating my experiences in this situation, and trying to give the OP an alternative to sandwiching radiators and fans together.
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post #28 of 28
Thread Starter 
Just thought I'd update this thread with my results.

The 240 gt stealth turned out to be faulty and leaked so i bought a black ice gtx lite 240 instead. I think fin density is pretty similar to the stealth but its twice as thick.

Despite using noctuas and quite high fin density rads i still get max of 66C on my 4GHZ i7 and a max of 51C on gtx580. Which i think is pretty good?

Plus if I ever need more performance i can just swap out the fans as the rads will be up to it

I'm using all fans as push.

EDIT:

Rads are separate not sandwiched. Ditched that idea when i heard about how rubbish it would be.
Edited by Aidan - 3/25/11 at 3:01am
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