Fans Help

[diehrd]

Hi all question on 2 fans.

delta screamer 60mm at 38cfm pumps many rpms and seems to push with a strong preassure.

92mm fan 50cfm low rpm not a lot of force pushing out of it.


Will the 92mm with less force cool as well at that screamer on a heat sink ?????

Really need opinions on this one guys.So chime in !!

[WarriorII]

Will the 92mm with less force cool as well at that screamer on a heat sink ?????

ahhh....NO.
I have tried this by using a homemade reducer. 92mm 43.5cfm fan down to a 60mm size. Results were not good.

I had a Delta black label, and switched to a YSTech fan instead.

I still have the 92mm in the side of my case tho.....that helps a lot!

Need pressure to "get in-between the fins".

Just my thoughts.

:cool:

[Breadfan]

Yeah, you need alot more CFM outta a case fan to match a Delta. Those thigns are loud, but they are quite awesome! I'm gonna try a few combos on my HHC-001 when I get it, cuase I'd like to use a 50+ CFM 92mm on it.

Saw a review a little while back somewhere that tested the difference between the delta and 80 and 92mm fans on a hsf. It seems that a 50+ cfm 92 mm was all that came close to so much as matching the delta. Even then it wasn't as good.

On my current setup, I've got an Antec 92mm case fan (unsure of CFM but I think its in the 30's) instead of the Delta38 that came iwth my WBK38. Its much quieter, and performance is comparable. Ofcourse, the WBK's fins are alot further apart than some of the new copper hsf's.

Interesting to note though, on my WBK I just stretched the clips that retain the fan onto the 92mm. Its a very far stretch, but works. The interseting part is that I used no fandapter.

To me that raises a question that I'm gonna try and resolve when I try out fan combos on my new hsf when it comes. Which is better, a funnel fandapter or a standard adapter that lets the fan blow around the hsf?

Its hard to say, but to me it would seem that the funnel would slow the air down as it reaches the resistance. However, if the fan was just sitting freely ontop and had no restrictions like that, then the air would blow through the hsf and also around it which may help airflow through the fins.

If I do test this, I'll try to put a thermistor next to the cpu's core, cause I know the onboard thermistor will go nuts with air blowing over it from the unrestricted 92mm fan! With any luck I'll have the parts this weekend to try it out.

I personally feel funnel adapters are flawed because the thought is to "focus" the airflow. Sure it does that, but it also restricts it and slows it down which would negate the focusing effect anyway...we'll have to see though.

Mike

[oc jason]

well as far as actual cooling the bigger fan will always out perform it. just look it has like 12 cfm more and i PROMISE its quieter.

May not work good on a 80 or 60 mm heatsink as it will not affectivelyl suck all the air possible over the HS due to the dead spot on hte 92 being larger than the Delta.

[diehrd]

Ok I never intended to apply the 92mm to the sink directly/

I have 2 intake ducts that are pvc I was going to mount the fan to the end of the duct which would have fan sit approx 1/2 inch over heat sink >not directly on it like the 60mm delta.


What are your opinions on this type of a mount.I am at 39c max load currently so if I go to 45 c or less I would be siked cause of the noise reduction.....

And I have a fear of starting system with no fan directly on heat sink with out opinions lmao ///////

[Breadfan]

Well as long as you mount the fan over the hsf, like 1/2inch, and not on the side of the case blowing through the pvc tube!

Obviously the further the fan is from the hsf, the less force the air will have. Get it as close as you can to the hsf. Ofcourse, funnel fandapters keep the fan mounted far above the hsf, I've never seen on in person, but looks like they'll add in inch or more between the hs and the fan! So, 1/2inch should be just fine.

Give it a shot and monitor the temps. Make sure the fan is plugged in before you go! As long as its plugged in, and 1/2inch over the hsf like you said, and blowing over it, then you shouldn't fear much in the way of immediate catastrophy.

I think it'll work pretty decently, your setup may even be better than a fandapter anyway. Give it a shot and let us know how it works for you! Worse case scenario it doesn't perform well and you put the delta back on.

Mike