SPCR

Hey guys,

Looking for a good 120x38mm Heatsink fan for some upcoming upgrades I plan to make and initially I had settled for the San Ace 101 from Newark which should work dandy but! They don't come with a connector already attached (3-pin).

Is this hard to get or do?

Otherwise, what else might you guys suggest? I've looked at Panaflos, Rexus' (Panaflo Re-brand, yeah?), and some others on Newegg and Frozen Cpu.

Frozen CPU had one that looked interesting but I can't find much in the way of info about it.

http://www.frozencpu.com/products/2519/ ... g36c15s562

I plan on taking a 38mm fan and fan controlling it down to an acceptable noise/cooling level.

What might you guys from your personal experience suggest?

What are you trying to cool that requires 2800 RPM of pure NOISE ? And to be honest none of those fans will be "quiet" unless they are off

There are no good 38mm fans I am aware of.

If you really want to go that route, try the 55mm Feser fan

http://www.performance-pcs.com/catalog/ ... s_id=26044

But even this fan, even undervolted, is not going to be especially quiet.

38MM is for high impedance. Why do you need such high pressure performance?

Pushing air through a Prolimatech Megahalem towards the rear of the case.

From what I had gleaned through research (and please correct me if I'm wrong) I figured a single 120x38mm fan pushing air through whilst undervolted would provide optimum cooling due to the high static pressure at an acceptable noise level.

Or would I be best off just getting an S-Flex or two and undervolting them appropriately?

Siegfried262 wrote:Pushing air through a Prolimatech Megahalem towards the rear of the case. From what I had gleaned through research (and please correct me if I'm wrong) I figured a single 120x38mm fan pushing air through whilst undervolted would provide optimum cooling due to the high static pressure at an acceptable noise level. Or would I be best off just getting an S-Flex or two and undervolting them appropriately?

S-Flex apparently aren't all that good with back pressure. But I don't think that is going to be an issue with the Prolimatech Megahalem.

The Prolimatech Megahalem is quiet and performs well at low fan speeds. That would indicate that it doesn't generate a lot of impedance or back pressure.

Try two PWM fans in push pull. Performance-PCs has 3 Scythe PWM fans. Two of the are based on the SlipStream. Get a pair of one of the PWM fans. Akasa and Rosewll make PWM splitters that permit two fans to operate off the same motherboard PWM header.

Most of the time I think you will find those fans operating an minimum speed.

Still they both have a large reserve of horsepower if things warm up temporarily. Two of these fans running at full speed, one on each side of the fan array, should be able to supply air far in excess of what even the Prolimatech Megahalem can make use of.

But I bet that they will always be running at minimum speed unless you have a really large thermal load you are pumping into the cooler.

Hmm, my case is a CM 690II advanced which when I get to doing all the stuff I want to do with my silencing project (still about a month or so off) it'll have adequate ventilation.

Two top S-Flex's, a rear exhaust S-Flex, and three intake S-Flex's (two bottom, one front) All of which will be connected to a 6 channel fan controller.

Heat shouldn't be too much of a problem, I'll be replacing a stock Intel cooler with stock thermal paste on an E8400 with the Megahalem and a fan or two with Gelid GC-Extreme thermal paste.

Also, with a PWM fan is it possible through the motherboard or software to cap the maximum amount of rpms the fan will spin at?

I'm hoping to find a fan that will cool sufficiently but won't push past the audio level established by the case fans I'll have.

Siegfried262 wrote:Two top S-Flex's, a rear exhaust S-Flex, and three intake S-Flex's (two bottom, one front) All of which will be connected to a 6 channel fan controller.

I'll be replacing a stock Intel cooler with stock thermal paste on an E8400 with the Megahalem and a fan or two with Gelid GC-Extreme thermal paste.

Also, with a PWM fan is it possible through the motherboard or software to cap the maximum amount of rpms the fan will spin at?

I'm hoping to find a fan that will cool sufficiently but won't push past the audio level established by the case fans I'll have.

1. Seems like you have too many fans. I would start off with fewer and see how that works are first.

2. For horizontal fans, consider the Scythe Gentle Typhoons running at their lowest speed. They are the only enthusiast fan with real "BALL" bearings. Everything else, even the s-flexes are just gussied up sleave bearings.

3. I had some variable fan controllers. I junked them all for this.

Akust Power Splitter PCI Card with 16 Separate Outputs
http://www.performance-pcs.com/catalog/ ... s_id=25981

In real life use it's, cheaper and more practical than the fancy controllers (go take a look at user comments at new egg on fan controllers). You don't even have to mount the Akust, just leave it on the floor of your computer.

It makes it a lot easier to experiment with reproducible configurations. When you find what works you just leave it as is. Those other fan controllers, by their very nature generate a rats next of wires. It's hard to figure out which wire belongs to which fan - which takes all the fun out of it.

4. For vertical fans, the 1200 rpm slipstream at 5 volts can't be beat. You have room to take it up a number of increments before it starts making noise. And if you want it to move a lot of air, it has the muscle to do that.

If you really want to use the S-flex try the SFF21F at 5 volts but it starts making noise once you go much above 5 volts (5v produces 550 rpm 19db and 14 cfm).

The 1200rpm slipstream at 5 volts runs at 720rpm 18db and 24cfm) You have to take the s flex up to 7 volts to do 23 cfm and it is generating 20 db to do that.

Look at these numbers

1200rpm slipstream
5V
18 dBA@1m
720 RPM
24 CFM

7V
21 dBA@1m
890 RPM
30 CFM

S-Flex SFF21F
7V
20 dBA@1m
890 RPM
23 CFM

Nexus
9V
19 dBA@1m
850 RPM
23 CFM

12V
22 dBA@1m
1080 RPM
29 CFM

5. I don't have a good answer on capping PWM fan speeds. A lot is determined by your motherboard maker. And it can vary from board to board of the same company.

I know there is some obscure device out there that specifically does that. But I don't remember what it is. You have to order from the UK.

If that is an issue, try the AKASA Apache. It starts at 500 RPM and stops at 1500 rpm. Also go to Performance CS. They have both Slipstream PWM fans. One of them has a user adjustable range.

ces wrote:5. I don't have a good answer on capping PWM fan speeds. A lot is determined by your motherboard maker. And it can vary from board to board of the same company.

I know there is some obscure device out there that specifically does that. But I don't remember what it is. You have to order from the UK.

The Zalman PWM Mate will do this, available worldwide including http://www.quietpcusa.com/Zalman-PWM-Ma ... 656C7.aspx.

I might add that my local hardware dealer ships Core i7 systems overclocked as standard to either 3.8Ghz or 4Ghz. The CPU cooler in both cases is the Prolimatech Megahalem, and they fit a single Akasa Apache Black 120mm PWM fan. It is quite common for users of systems like this to replace a 120mm exhaust fan with a matching Akasa Apache Black and link it to the CPU fan with the Akasa PWM fan splitter cable. For Core i5/i7 systems this can mean fan rpms in the 500/600 rpm range at idle, which increase automatically because of the PWM to the 1000-1200 range under heavy load. I have seen gaming cases with this setup and a number of manually set case fans. Because the PWM CPU/exhaust speed up with load the manually set case fans can be set very low without any concerns about excessive temperatures.

This does involve motherboard settings as well. For example on Asus motherboards it is necessary to turn Q-Fan on and set it to Silent mode.