Dell fan swap

Jay F · Post by **Jay F** » Sat May 19, 2007 5:35 am

Hi,

My Dell Dimension 5000 has this fan:
http://www.centrix-intl.com/details.asp?productid=3607
NMB-MAT DC Axial Fan 4715KL Series.
12V DC 1.30A 120mm x 38mm (4.69in x 1.50in)
3600RMP 130CFM and 50dB.
Ball Bearings with Thermoplastic Frame and Impeller.
Model: 4715KL-04W-B56 Y4574 H9073

Are there any fans which I could swap it with? I don't think there are

130CFM is pretty high, and it needs a 4-pin (not molex, but PWM) connector

angelkiller · Post by **angelkiller** » Sat May 19, 2007 5:41 am

What CPU are you cooling?

Max Slowik · Post by **Max Slowik** » Sat May 19, 2007 7:50 am

Pentium 4, 1.21 jiggawatts. . .

I googled that it's socket-775, should that be the case, you can safely replace it with a better aftermarket heatsink. It probably has an aluminum block that really does require 130CFM to cool it effectively.

frankgehry · Post by **frankgehry** » Sat May 19, 2007 11:28 am

High speed pwm fans can replace both low and medium speed models because they can run at %20 of full speed. I doubt that it runs anywhere near top speed in actual use. At %20 a low speed model (1600 rpm) would run at 320 rpm. In fact, JMC does not list low speed pwm fans on their website.

Jay F · Post by **Jay F** » Mon May 21, 2007 1:12 pm

I may have to just leave it as it is, custom DEll MB with no holes for heatsink, and CPU mounted at 45 degrees!

angelkiller · Post by **angelkiller** » Mon May 21, 2007 3:09 pm

Jay F wrote:custom DEll MB with no holes for heatsink, and CPU mounted at 45 degrees!

Actually, this may be the BTX standard. Can't say for sure though.

Max Slowik · Post by **Max Slowik** » Tue May 22, 2007 5:16 am

How does the heatsink stay attached to the CPU? Every BTX case I've played with still had a regular socket 478 or 775 heatsink mount. Can you take a picture of it?

Jay F · Post by **Jay F** » Tue May 22, 2007 2:36 pm

Max Slowik wrote:How does the heatsink stay attached to the CPU? Every BTX case I've played with still had a regular socket 478 or 775 heatsink mount. Can you take a picture of it?

It's like this one on the left:
http://media.hardwareanalysis.com/artic ... /11353.jpg

You can see the rectangular spacing on the mounting holes

samuelmorris · Post by **samuelmorris** » Tue May 22, 2007 5:14 pm

I can't think of any PC that would need a 130CFM fan. I also highly doubt it ever reaches the full speed at 50dB or you'd know about it. That's the sort of PC you have to raise your voice to speak over. If it's attached to the heatsink I don't know, but if it's in a duct, or just as a regular case fan, swap it for something less excessive. A high speed Scythe S-Flex or Medium speed Papst 4412 would do the job fine, they can produce 70CFM or so at 30dB, and that's still more than enough airflow in a case where everything's passive, let alone if it isn't.