Originally Posted by pc-illiterate
the point is, pull is better than push for low rpm fans. .5*C is still a difference. i didnt say the chart showed a 10*C difference. pulling is prefered if you dont like cleaning your rad very often. push pull definitely makes a difference and even more so with shrouds on both fans with an h100. push/pull plus custom shrouds dropped my cpu temps 4-6* depending on ambient temp. to some people, every degree counts hence some people use their rads as intake. notice these were with different fans than stock h100. those things are god awful loud.
I'm only pointing out that the temperature difference is negligible. Also, push or pull really doesn't affect dust, only exhaust or intake does (however, in this particular case
with a 600T, setting up the H100 stock, pull would be exhaust and push would be intake).
There are people in this very thread who got no difference when adding a shroud to a Corsair Hydro cooler. There are others who have gotten no difference adding a second set of fans (including Corsair). Perhaps the air flow properties of your case had some effect, considering Corsair's tests were in a lab?
Originally Posted by kizwan My bad on the push being recommended. The difference on performance between the push & pull is very little.
I still preferred push than pull since the fans I use are high static pressure. Using it for pull will make them underutilized IMO.
In high ambient environment, which I did emphasize this in my previous post, negative pressure is the best. In my previous build, I use positive pressure with one high CFM fan at the back as exhaust. It did worked well in colder day but not in hotter day. After changed to negative pressure, temps much lower in hotter day.
My C70 case also have dust filter on the front & at the bottom. I use negative pressure & there is little dust accumulated in the case even after some time. Mind you, my house does have serious dust problem (old house) but dust accumulated in the case is minimal, almost 5 months now since the last time I clean up my case. My H100 radiator does take a toll though, dust accumulated on the radiator after some time (push + exhaust config). Still, almost up to 5 months & the radiator still look clean.
Agree that cases with intake dust filters are "da bomb". As for neg vs pos pressure, the big difference is that neg pressure causes air to flow into the case through any little crack or seam or hole in the case (such as USB ports, and seams between the case and the optical bay covers). This can cause an accumulation of dust at those points. With pos pressure, all the seams, cracks and holes are exhausting air, not pulling it in, and therefore do not accumulate dust.
Originally Posted by TomcatV Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)
I tend to agree with Kizwan when you are talking about the H100/i series that has a high density fin spacing, thin radiator (27mm). You were right initially, forget the "my bad" comment. Pull is not better than Push with high quality static pressure fans even down to the 1300rpm range! The article above by Martin is dated with relevance to the newer H100 AIO's systems with extremely low flow rates/high density-thin radiators. The radiator used in the article above is nothing like the H100/i radiator, it is 35mm thick and has a less dense fin spacing.
Additionally who would replace the fairly decent stock fans with a cheap no static pressure Yate Loon (D12SL-12) open chassis fan used in the graph below
Yate Loon specs [HERE]Warning: Spoiler! (Click to show)
Using this graph for a H100/i setup is like comparing apples to oranges ...
Martin has recently finished his H100i review [HERE]
It is very well done! With some envious H220 comparisons. Read it in detail, it's 10 pages full of answer's to questions that get asked in this forum all the time. And some info I was not aware of like did you know that the new H100i has gone back to using a steel pump shaft over the typically preferred ceramic shaft used in the old H100
Also has some great Noise vs Performance charts and even dBA measuring video's.
I would also highly recommend reading the "Comments" section below the article for a very interesting discussion between "citicalthinker" and Martin about pumps, flow rates, voltages and how Corsair engineers such an efficient system with incredibly Low flow rates.
More quotes I gleamed from Martin's review ...
http://martinsliquidlab.org/2013/03/13/corsair-hydro-series-h100i-aio-cpu-cooler/"While radiators normally are extremely low in restriction, that is not the case with the H100i. It must have very thin tubes to make it perform well at very low flow rates as the restriction is about 6X more than most radiators I’ve tested.
I forgot to measure the fin spacing, but it is a little more dense than the H220. It looks more like the RS240 fin spacing than it does the H220. This means it is more optimized for high-speed fans but a little too dense for optimal performance using slow speed fans.
I would not recommend expansion or modification to the sealed loop. Keep your warranty and leave it alone, any expansion will require lower restriction CPU block and likely more pumping power. The very low 0.11GPM max flow rate is far too slow to do much expansion with."
This helps understand why higher static pressure fans a very important for a H100/i AIO type system to perform optimally. There is also some interesting info/graph's on the AP-15 confirming what many of us have been saying all along. It has it's drawbacks but is still hard to beat if you feel you must replace your quite capable stock fans
The link to the Frozen CPU specifications for the Yate Loon fans does not list Static Pressure. However, if you check out this review:
which very thoroughly tests Yate Loons, you will see that they are actually pretty decent fans. You can find other articles and reviews and fan roundups (some right here on ocn) that specifically say Yate Loons are some of the best budget fans on a rad for performance vs noise.
Also, in fact, if you search this very thread for "Yate Loons" you will see extensive discussions of them earlier in the thread. One fellow quite swears by them as great rad fans for low noise applications.
It's funny when you've been a member of a thread like this for so long, and you see information earlier in the thread about a particular subject, and then a year or two later more information about the same subject only it completely contradicts the information earlier in the thread. It does show who has read and who has not read the entire thread though (no offense intended to anyone. We can't all read all of such a large thread unless we joined it fairly early).Edited by Mergatroid - 4/10/13 at 6:43pm