Delta with a SI-120

[Ojannen]

I have a few questions about my heatsink and fan combo. I currently have a SI-120 with a high speed delta triblade. For reference, I have this fan http://www.sidewindercomputers.com/de12trblhisp.html I have a custom built case and the fan is taking air diretly form the outside of the case.

Just checking on this one, but is the only difference between the high and low speed delta triblades the amount of power that gets to the motor? If both fans are running at 2000 rpm, are they going to be equally loud? Is the advatage to the low speed fan a softer (lower rpm) at the minimum start up voltage?

There does not seem to be a large change in temperatures between 7 and 12 volts with this combination of fan and heatsink. Is this normal? When I was researching the two products around christmas time, I did not see anything commenting on the fact that the SI-120 needs fvery little airflow.

Can I plug this fan into a dfi lanparty ultra-d motherboard header without blowing it out? I have heard a lot of conflict views on this one. Right now, I am trying to get rid of a fan controller while still being able to adjust the amount of ariflow moving through my case. I have found that even thyough the extra airflow does not help processor temperatures, it helps lower chipset temperatures.

Thanks
-OJ

 

[GalvanizedYankee]

I have a fan as you linked. I was going to use it for case intake duty but it does not undervolt well. It undervolts about as bad as a 120x38@114cfm Chinaflo. This DTB will start/run at 4V in silence but by 5V it is in protest=clicking/grumbling.
I now use a Sanyo Denki 120x38@102.5cfm@39dBA. It runs silent at 5V@about 47cfm and ramps up very well as more voltage is applied.

Your SI-120 does not need over 50cfm to get 90%of it's cooling work done. In the stickied reviews at the top of this page, read what overclockers.com has to say about cfm vs cooling for your sink.

At the most a 60cfm fan will give you all the SI-120 has in cooling capacity. There are several good 120x38 and quite a few 120x25 that will work well. Just make sure the fan you buy has a tach/sensor feed wire.


...Galvanized

 

[Bull Dog]

Well I have the DTB low speed version and its bearings where REAAAAAAAAALLLLY noisy at first. Anything over 600RPM annoyed the heck outta me, until it hit about 1500RPM and rushing noise from the air movement drowned it out. But after two weeks the bearings have gotten a lot quieter. In fact the fan is now as smooth as butter.

 

[GalvanizedYankee]

Originally posted by: Bull Dog
Well I have the DTB low speed version and its bearings where REAAAAAAAAALLLLY noisy at first. Anything over 600RPM annoyed the heck outta me, until it hit about 1500RPM and rushing noise from the air movement drowned it out. But after two weeks the bearings have gotten a lot quieter. In fact the fan is now as smooth as butter.

The fan had been dropped at one time. Maybe not by you but by the vendor.

I have several of the DTB in 92x25@40cfm=sweet at all voltages, start/run@3.5V.
I have two of the DTB 92x38@57cfm=sweet at all voltages, start/run@3.5V.
I have two of the DTB 92x38@79cfm=not so sweet at all voltages. They are silent at 3.5-5V but due to the strong magnets exhibit some motor clicking fron 5-9V.

Dropping any fan is not reccomended, particularly ball bearing fans.

...Galvanized