what 80mm fans to get

[sminker]

I have an Antec SX1000 case, currently with 3 Antec 80mm fans, 2 in the back and 1 in the front. I want to buy 2 fans that have high CFM and decent noise for the rear exhaust fans. I heard something about that if you have more exhaust than intake you will create a low pressure system which will lower the CPU temps. not sure if its true but i just wanted to test it out. Anyways, what types of 80mm fans do you guys recommend. remember im looking for high CFM with decent noise. truthfully i dont care about the noise, just i think it would be nice if i didnt have to listen to the constant landing of a 747 Jumbo jet everytime i went into the computer room.

[Xanthro]

Originally posted by sminker
I have an Antec SX1000 case, currently with 3 Antec 80mm fans, 2 in the back and 1 in the front. I want to buy 2 fans that have high CFM and decent noise for the rear exhaust fans. I heard something about that if you have more exhaust than intake you will create a low pressure system which will lower the CPU temps. not sure if its true but i just wanted to test it out. Anyways, what types of 80mm fans do you guys recommend. remember im looking for high CFM with decent noise. truthfully i dont care about the noise, just i think it would be nice if i didnt have to listen to the constant landing of a 747 Jumbo jet everytime i went into the computer room.

That's backwards, lower pressure equals higher temps. You want your system slightly overpressured to have the best temps.

Look at it this way, the lowest pressure would be a vaccum with no air in there, how would you system cool then?

You also want a method to remove the air right by the HSF.

Xanthro

[Blix]

A Sunon 80mm Ultra high speed fan seems to fit your profile.

I just bought the same case. I was looking for same thing.
Check out
http://www.sidewindercomputers.com/80120mmfans.html
Cool thing about this site is that u can actually hear the fan sound. A cool feature for a noise-sensitive builder I think.
You can also see all the specs of fans they're carrying.

The fan(Sunon 80mm Ultra high speed) is not too noisy and has pretty decent CFM output if the info on the website is correct. Try comparing with others.
I am thinkin of buying this fan also.
Also, I would appreciate if someone post some feedback on Sunon fans. I think I heard good things about them.

[sminker]

according to science, high pressure increases temps, its used in making fake diamonds, high compression causes the heat to rise, changing the carbon to a diamonds. and look at outerspace, there is no pressure in outerspace and the temps are WAY below zero when the sun isnt on you

[Xanthro]

Originally posted by sminker
according to science, high pressure increases temps, its used in making fake diamonds, high compression causes the heat to rise, changing the carbon to a diamonds. and look at outerspace, there is no pressure in outerspace and the temps are WAY below zero when the sun isnt on you

I don't know whether to take you seriously or not, I'm hoping you're joking.

Why don't you take your computer and run it in outer space and see how long it takes before it burns up.

The cold of space is not caused by the low pressure, it's caused by the fact there is no medium to hold heat. No medium equals no heat.

While extremely high pressure will create heat, this is because the compression threshold of the material has been surpassed. We're not talking about taking carbon and making diamonds, we are talking about the amount of air moved in your case to remove heat from the Heat sink.

Under pressurized systems have less air to move, and thus run a bit hotter. Think about it, no air inside you case, no air for the fan to across the heat sink. It wouldn't matter that the pressure would be zero, your CPU would burn up because there is no way to disapate the heat.

If you were joking about this, that's one thing, but it appeared you were serious.

Xanthro

[sminker]

dude, there is going to be airflow. air comming from the front and going out the back, passing directly over the CPU. the only different is that the air is going to be released as fast as possible. right now i have more exhaust than intake and my temps are pretty damn low. im not talking about having no intakes, im just saying that im going to have more exhaust CFM than intake CFM, and i never said it will work, i just said i heard about it and im going to try it. And at the university of florida they are conducting tests to see how low they can get temperatures, and you want to know what, they are using a NO PRESSURE environment.

[lonewolfz28]

Only 1 problem, your case is not a sealed environment. If you have negative pressure in your case, you are pulling air in from every crack in your case. This introduces extra dust into the case.

When you have positive case pressure (more intake than out) you can better control the quality of air that enters your case. For system longevity with low maintenance, you should be running filters on your intake fans.

It's up to you but I don't like seeing my temps slowly rise to the point I have to buy a can of compressed air to blow out all the dust in my case (it's in the same room as the kitty litter).

To each their own, but I prefer low maintenance .

[Xanthro]

Originally posted by sminker
dude, there is going to be airflow. air comming from the front and going out the back, passing directly over the CPU. the only different is that the air is going to be released as fast as possible. right now i have more exhaust than intake and my temps are pretty damn low. im not talking about having no intakes, im just saying that im going to have more exhaust CFM than intake CFM, and i never said it will work, i just said i heard about it and im going to try it. And at the university of florida they are conducting tests to see how low they can get temperatures, and you want to know what, they are using a NO PRESSURE environment.

That's because they are using another medium of heat exchange. If I wanted to use a liquid cooled system I could have a NO PRESSURE environment because I'm not counting on air to move heat.

Given the same medium, Density and tempature differential are the two factors that. Denser and cooler air by defination is more effective at removing heat. While the density of the air is going to be slight between and over pressurized system and an under pressurized system, other factors will make the over pressurized system cooler.

In under pressurized systems, the low pressure causes air to infiltrate through all possible areas of intake, this brings in dust and picks up heat from other components.

An over pressurized system has air escaping out of these same areas, keeping dust out and removing heat from other components. Plus you get the benefit of greater air density.

Try whatever you like, but you orginally claimed that under pressurized was better as if this were a proven fact, and it is not.

Xanthro

Just how do you think air removes heat anyway?

[lonewolfz28]

To answer the original question: get some Panaflo L1A or M1A's from caseetc .

Good flow, low noise, decent price.

Could also try Sanyo-Denki's from kdcomputers . I've got a couple in my system with no probs.

[fewtch]

Actually i can say from experience -- the Panaflo L1A has very low airflow. Yes it's quiet, but it simply doesn't push/pull much air. I got one running on the back of my case & it's adequate for this (non-overclocked) system, but airflow really is pretty minimal with that one. I sure wouldn't recommend anyone use one with an 80mm adapter as a CPU fan.

[lonewolfz28]

It'd work good in the rear positions with the M1A's in the front. Quiet, good flow and positive case pressure.

Didn't see anything about O/C'ing or fan adapters in the original post. I thought they just wanted good quiet cooling.

[sminker]

Xanthro please read. I NEVER ONCE claimed that it will work. I just said that i heard about and that i was going to try it. So please read before you post next time.

[JWU42]

I have found that the YS Tech 37cfm @ 30 Db are the best mix of performance (High cfm) and noise. Their 47 cfm get up towards 40Db and are a bit loud in the front of the case.

I got mine at SubZero PC

http://www.subzeropc.com/store/fan80253b.htm

[ww2717]

best combination of airflow and dB ratio would be the Panaflo U1 series 80x25mm fan @ 47cfm
available at www.millisec.com

[JWU42]

Where do you find this Panaflo series?

I have seen L1, H1, and M1 but not U1