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Better: 2050RPM w 9 fins or 2600rpm w 7 fins

post #1 of 12
Thread Starter 
Hey OCN,
I am trial and erroring my 120mm for my CPU cooling. As you can see, I have tuniq and it comes with stock 9fin fan. I inserted some old 7 fin fans to my mobo and witnessed that these have much higher rpm. I know that rpm doesn't always directly impact air flow performance, but I don't have a tool to measure it. And I can't really see much difference in temp from prime95/core temp observation during load. So, theoratically, which one should give me better performance?
Edited by legendor - 6/27/08 at 3:01pm
    
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post #2 of 12
Well is the fan with 7blades have bigger blades? That with increased RPM could cancel out the difference or maybe a slight improvement.
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post #3 of 12
Thread Starter 
And what's wrong with the reading? I used the same fan on the same slot and the max rpm drop of 100!!
LL
    
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post #4 of 12
Quote:
Originally Posted by legendor View Post
And what's wrong with the reading? I used the same fan on the same slot and the max rpm drop of 100!!
I don't quiet understand what your pointing out. Your value is matching your max... are you talking about the minimum?
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by Longer Shot View Post
I don't quiet understand what your pointing out. Your value is matching your max... are you talking about the minimum?
Max of course. I am running stress test so my rpm should be exactly same or similiar. IDK why there is 100 rpm difference after I just swap the fans' positions.

Edit: The attached picture shows two different situation. I took another screen shot(after re positioning the fans) over the picture I had taken before.
    
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post #6 of 12
Could just be a mis-read, maybe the fan is getting slightly more juice. Nothing to worry about, my guess is that it just caught the fan at a bad time
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post #7 of 12
Are you assuming that two different fans, even though run at the same voltage, will run at the same RPM?
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post #8 of 12
Blade angle, length, position, bend, alot of things depend on what goes into a good fan. More so than RPM and blade number
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post #9 of 12
Thread Starter 
Quote:
Originally Posted by Longer Shot View Post
Could just be a mis-read, maybe the fan is getting slightly more juice. Nothing to worry about, my guess is that it just caught the fan at a bad time
Ya. I'll listen to you. 100rpm isn't much difference?

Quote:
Originally Posted by billbartuska View Post
Are you assuming that two different fans, even though run at the same voltage, will run at the same RPM?
Same fan, same slot on mobo, but one inside my tuniq and the original cpu fan outside of tuniq.
    
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post #10 of 12
100rpm difference is completely normal. It goes up and down depending on the slight variations of juice, turbulence, and heat.


edit: There ya go. Inside the Tuniq has more turbulence, so less rpm
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