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Salkcin · 12-29-2005, 06:57 PM

It's funny how different people experience noise and what they call "loud". A 120mm fan at 2100RPM like the Panaflo M1A would make me going crazy, but a lot of people around the world call it "low noise" (but not in Denmark!). A Panaflo L1A (1700RPM) is what I call "acceptable", but it's for sure not silent!

As I already wrote my Papst 4412F/2GL (120x25mm, 1600RPM, Sintec sleeve bearing...) is also acceptable like the Panaflo L1A, but I prefer it at 7v. Also I've seen at different sites that this fan is not a good choice for radiators.

My point of making this thread is my concern of the current radiator designs. The radiators on the market have a very restrictive air design with louvered fins, short space between the fins, the radiators are 5cm thick... 120mm fans at low speeds like 1200RPM won't be able to cool the radiator efficiently enough allowing uncooled water to pass. These radiators are great for people tolerating fans like 120x38mm Panaflo M1A @ 2100RPM, but not for most danish people - we want 120x25mm fans @ >1200RPM.

My friend recently switched his DangerDen double heatercore out with a Hayden 676 (stacked plate aluminum oil cooler - formerly used in Swiftechs kits). He gained about 5 celcius degrees load on his 4,2GHz Prescott with the fans at same speed (running below 1200RPM). His explanation is that the Heatercore was to thick for low CFM fans like 120mm @ >1200RPM so that uncooled water passed through the heatercore.
I recognize what he says when I look at the PA160.1 - the core is only 25mm thick and it's made for low noise fans, but it's unfortunately to big for my miditower. I now turn for PA120.X, but I'm skeptical about it's thicksness of 61mm - will it suffer like the heatercore did?
I find it interesting to that Swiftech's own radiators only are 30mm thick and they are know for high performance systems... maybe there's something to it - but only for people who REALLY NEED SILENCE.

I have then concluded that the high fin desinty, louvered fins and so on will not change now so I'm looking for a fan that can overcome the resistance and pruduce a lot of pressure at low RPM. Therefor I'm interested in the SilverStone fans in my #1 post... they have 9 blades wich should make them good to make pressure - one of them is also 32mm thick wich also helps.

I don't hope the post is to long

12-29-2005, 06:57 PM	#28
Salkcin Cooling Neophyte Join Date: Nov 2005 Location: Denmark Posts: 22	Re: How to choose the optimal 120mm fan? It's funny how different people experience noise and what they call "loud". A 120mm fan at 2100RPM like the Panaflo M1A would make me going crazy, but a lot of people around the world call it "low noise" (but not in Denmark!). A Panaflo L1A (1700RPM) is what I call "acceptable", but it's for sure not silent! As I already wrote my Papst 4412F/2GL (120x25mm, 1600RPM, Sintec sleeve bearing...) is also acceptable like the Panaflo L1A, but I prefer it at 7v. Also I've seen at different sites that this fan is not a good choice for radiators. My point of making this thread is my concern of the current radiator designs. The radiators on the market have a very restrictive air design with louvered fins, short space between the fins, the radiators are 5cm thick... 120mm fans at low speeds like 1200RPM won't be able to cool the radiator efficiently enough allowing uncooled water to pass. These radiators are great for people tolerating fans like 120x38mm Panaflo M1A @ 2100RPM, but not for most danish people - we want 120x25mm fans @ >1200RPM. My friend recently switched his DangerDen double heatercore out with a Hayden 676 (stacked plate aluminum oil cooler - formerly used in Swiftechs kits). He gained about 5 celcius degrees load on his 4,2GHz Prescott with the fans at same speed (running below 1200RPM). His explanation is that the Heatercore was to thick for low CFM fans like 120mm @ >1200RPM so that uncooled water passed through the heatercore. I recognize what he says when I look at the PA160.1 - the core is only 25mm thick and it's made for low noise fans, but it's unfortunately to big for my miditower. I now turn for PA120.X, but I'm skeptical about it's thicksness of 61mm - will it suffer like the heatercore did? I find it interesting to that Swiftech's own radiators only are 30mm thick and they are know for high performance systems... maybe there's something to it - but only for people who REALLY NEED SILENCE. I have then concluded that the high fin desinty, louvered fins and so on will not change now so I'm looking for a fan that can overcome the resistance and pruduce a lot of pressure at low RPM. Therefor I'm interested in the SilverStone fans in my #1 post... they have 9 blades wich should make them good to make pressure - one of them is also 32mm thick wich also helps. I don't hope the post is to long Last edited by Salkcin; 12-29-2005 at 07:14 PM.