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T.R.U.E. Fan - 3-pin or 4-pin?

post #1 of 11
Thread Starter 
Installed my TRUE and while waiting for a 4-pin fan to arrive I just threw on my blue led 3-pin fan that came with my CM-690 case. My new fan arrives and low and behold the issue that I have the most with the way the fans mount on this cooler is that there are no holes to mount the fan. It's just a solid tube going from one side to the other. Needles to say I was rather ticked off after waiting for snail mail from Jab-Tech to arrive and I saw no other choice but to use zip ties. My word how ugly that looks on such a nice looking cooler.

Is there any other way to mount this fan with the supplied clips or am I forced to use zip ties? Also what is the real difference between using a 3-pin or 4-pin connector? Won't the MB regulate the fan speed for either type if it is still hooked up to the CPU fan plug or does it just run at 100% with the 3-pin?

My 4-pin may be ugly with the zip ties but it idles at 384rpm and rarely goes over 600 on full load while gaming. I just can't remember what my fan speed was on the 3-pin CM led stock fan but I don't recall hearing it over my other case fans.

I guess after this long wind of questions it boils down to if there is a difference really between the two fan types for CPU control and if there is an alternate way to mout them with the stock clips.
post #2 of 11
Im sure its 4 pin. It doesnt really matter. The 3 pin is backwards compatable with the 4 pin and the 4 pin will fit on 3 pin. My zalman is 4 pin. My stock heatsink is 4 pin and my water block is 3 pin.
post #3 of 11
you do mount the fans with the included fan clips; http://www.thermalright.com/new_a_pa...120ex.html#fan

the 3 and 4 pins are interchangeable if you place them in the cpu_fan in your motherboard, if i am correct. unless i'm way off topic?
Edited by agntallen - 5/12/08 at 8:54pm
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post #4 of 11
Thread Starter 
I know that the pins are backwards compatible. My question is if you use a 3-pin fan on the CPU 4-pin MB connection does the MB still control the fans speed or is it just going to run at 100%?
post #5 of 11
Thread Starter 
Quote:
Originally Posted by agntallen View Post
you do mount the fans with the included fan clips; http://www.thermalright.com/new_a_pa...120ex.html#fan

the 3 and 4 pins are interchangeable if you place them in the cpu_fan in your motherboard, if i am correct. unless i'm way off topic?
I have seen that link on how to mount the fan. If you look closely at where the clip seats into the fan, the space is open. Some fans are not open like that between the front and back plate and it is solid plastic with a hole drilled all the way through. It would be impossible to use the stock clips according to the installation instructions. Maybe this is something that Thermalright should look into because most of the fan companies (Yate Loon, Scythe, Delta, etc.) that I have purchased recently have these types of screw holes and when ordering online it is impossible to tell what you are getting without seeing a side-view picture that shows the hole mounts.
post #6 of 11
Quote:
Originally Posted by Mercyflush64 View Post
I know that the pins are backwards compatible. My question is if you use a 3-pin fan on the CPU 4-pin MB connection does the MB still control the fans speed or is it just going to run at 100%?
the motherboard will control the fan speed.

as for the fan. the zipties are not the only way of mounting the fan (i'm sure) but it maybe the only way for now.
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by agntallen View Post
the motherboard will control the fan speed.

as for the fan. the zipties are not the only way of mounting the fan (i'm sure) but it maybe the only way for now.

Thanks for the info, always wondered about that 3/4-pin deal and if it was really an issue or not. +1
post #8 of 11
Yeah, if you just plug in a 3pin fan, it'll go at 100%. Also, I had a Closed corner (the tube you were talking about) fan. To get it mounted you just need to drill, or saw.. or cut the tube part partially out so you can slide the fan retention brackets on.
post #9 of 11
I had a similar situation with the fan I used on my TRUE. If you look at the pic, it didnt have the holes for the clips because it has an odd frame design. I used a dremel to "modify" the back of the faceplate with four strategically placed notches to hold the clips


As far as 3 pin vs 4 pin (PWM) , its like mentioned above, you can run a 3 pin fan off of the 4 pin cpu fan head, but the mobo wont be able to control the rpms, the fan will run flat out. In the 4 pin config the fourth pin controls rpm. Normally the 4 pins are 1 pin for +12v Hot, 1 pin for -Ground, 1 pin for RPM monitoring, 1 pin for PWM control

good luck
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post #10 of 11
It should be stated that you CAN reduce the speed manually through the mobo, but if you want the fan to vary with temp then you need the 4 pin. I can reduce the speed on my board, but that's the speed you get.
    
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