Is the CPU_FAN optional?

Y

_yo_wasup_

New Member

Joined

Jun 9, 2008

• Jun 15, 2008

• #1

I installed a Thermalright Ultra-120 Extreme just now, and if you're not familiar with this heatsink, it requires a 120mm fan to be attached to it. I got a Thermaltake 120mm blue LED fan, and installed it, but I want to make sure when I try to start my computer, it won't fail a post because it doesn't identify anything plugged in as a CPU Fan. My motherboard is the ASUS Rampage Forumla. Is the CPU_FAN optional? or do I still figure a way to plug this into the CPU_FAN? Any help would be appreciated.

 

Moto7451

Senior Something

​

Joined

Feb 24, 2004

Location

LA, CA

• Jun 15, 2008

• #2

You can generally turn off the warning in the BIOS. I take it the fan is plugged into a different header or is plugged into a 4pin Molex? If it's connected to a different 3 pin header you may want to just move it over to the CPU Fan header.

 

Blazing fire

Member

​

Joined

Sep 5, 2007

• Jun 15, 2008

• #3

Well, in a way yes, the CPU_FAN is optional but you loose the ability to adjust fan speed (for most motherboards). For asus boards, go under sensors and set it to Ignore. Hope that helps!

 

OP

Y

_yo_wasup_

New Member

Joined

Jun 9, 2008

• Jun 15, 2008

• Thread Starter
• #4

Well, the fan cables look like this, (they come with a speed adjuster):
http://www.thermaltakeusa.com/Uploa...1-81accf7e4c6f/A2016&A2017&2018_en_031204.zip

I have it set to the manual mode so it will adjust the speed to what I adjust it to, and I am not using the temperature sensor. I would be plugging this into a 4 pin power connector, yes. Is this setup fine, or is there something I should be aware of?

 

ou_phidelt

Member

​

Joined

Mar 6, 2004

Location

Rockingham, NC

• Jun 15, 2008

• #5

That is fine. As long as you have a fan on it you are good to go. Just turn of the warning in the BIOS so it stops bugging you.

 

OP

Y

_yo_wasup_

New Member

Joined

Jun 9, 2008

• Jun 17, 2008

• Thread Starter
• #6

So most likely I will have to press F1 to continue then right? (until I disable it in BIOS)

 

benbaked

Folding/SETI/Rosetta Team Member

​

Joined

Oct 20, 2005

Location

WA

• Jun 17, 2008

• #7

When overclocking there used to be a train of thought running around that you should never use any fan headers on the motherboard to keep unnecessary loads running through your motherboard. Sounds good in theory, but I have no idea if its true.

 

Blazing fire

Member

​

Joined

Sep 5, 2007

• Jun 17, 2008

• #8

I hope not! Assume I use 2 120mm 220cfm delta fans, each consuming 29watts, I don't think it should cause insufficient power for the CPU etc. I mean, a quad core consumes 200watts on load and 58watss should not affect it too much. Also, most of us don't use 29watt fans.

 

MastarPete

Member

​

Joined

Feb 16, 2004

Location

Carol Stream, Dupage, IL, gmt-6, USA, North Americ

• Jun 18, 2008

• #9

benbaked said:

When overclocking there used to be a train of thought running around that you should never use any fan headers on the motherboard to keep unnecessary loads running through your motherboard. Sounds good in theory, but I have no idea if its true.

Click to expand...

that's close, but I've heard its more of a factor of the fans requiring more wattage than what the mobo's fan header was designed to handle.

ie. mobo manual says don't exceed 5W. and you've got an 8W fan.

 

Moto7451

Senior Something

​

Joined

Feb 24, 2004

Location

LA, CA

• Jun 18, 2008

• #10

Yeah, a lot of our fans, namely high speed deltas and high speed 120mm fans are too much for the headers in many cases. Heatsinks have gotten bigger and have been better optimized for running larger sized, quieter, lower power, fans in a lot of cases so I'd argue that it's less of an issue today. Mobo makers have also been doing a better job with the headers themselves. IIRC a lot of Socket A boards only supported a 1-2W fan at max.