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post #1201 of 2110
it really does help
   
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post #1202 of 2110
Why do is it suggested to block off the top back (most rear top slot) and only mount a fan in the top front of the case? Wouldn't do intakes serve better cooling to the CPU's HS? 600

Hmm what were the results of 2 top intakes versus one blocked off? I understand now that you want to control the direction of the airflow through the case but if you just mounted a low / moderate CFM fan wouldn't it not interfere with the HS airflow.
post #1203 of 2110
I still think it would interfere with the airflow. It would probably slow it down making it less effective. Of course you could always give it a try and see what happens. DO IT FOR SCIENCE!
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post #1204 of 2110
Quote:
Originally Posted by Phishy View Post

Why do is it suggested to block off the top back (most rear top slot) and only mount a fan in the top front of the case?

reduce recirculation of HOT exhaust back into the case... people keep forgetting that INTAKE air is supposed to be cool. which means it's not supposed to mix with HOT exhaust air from the CPU, GPU, PSU. etc...
post #1205 of 2110
What are the best and most silent 120mm fans that can move a lot of air?
post #1206 of 2110
Quote:
Originally Posted by kevindd992002 View Post

What are the best and most silent 120mm fans that can move a lot of air?

Scythe Slipstream 800rpm
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post #1207 of 2110
Thread Starter 
Quote:
Originally Posted by Phishy View Post

Why do is it suggested to block off the top back (most rear top slot) and only mount a fan in the top front of the case? Wouldn't do intakes serve better cooling to the CPU's HS? 600

Hmm what were the results of 2 top intakes versus one blocked off? I understand now that you want to control the direction of the airflow through the case but if you just mounted a low / moderate CFM fan wouldn't it not interfere with the HS airflow.

This is where a low ceiling case can produce a wind tunnel effect. You're pushing air from the front of the case to the back with the cpu heatsink standing in the way, where it benefits from the breeze. Putting a fan in the rearward top position can actually interfere with front-to-back airflow.

 

This approach is not helpful with a high ceiling case. With a significant space between your heatsink and the top of the case you can't really get that straight-through airflow that a wind tunnel requires. Instead, you have a system that acts like a bagpipe. In such systems, if you have both positions filled with intake fans you will get superior results.

Quote:
Originally Posted by ohhgourami View Post

Quote:
Originally Posted by kevindd992002 View Post

What are the best and most silent 120mm fans that can move a lot of air?

Scythe Slipstream 800rpm

 

I agree. I started with a prejudice against Slip Streams. But the more I used them the more impressed I was. Now I am a fan of Slip Streams.

 

I only want to see two changes: an FDB bearing in place of the sleeve bearing they now have, and a change in name to 'Slipstream.' biggrin.gif

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post #1208 of 2110
Quote:
Originally Posted by ehume View Post

This is where a low ceiling case can produce a wind tunnel effect. You're pushing air from the front of the case to the back with the cpu heatsink standing in the way, where it benefits from the breeze. Putting a fan in the rearward top position can actually interfere with front-to-back airflow.

This approach is not helpful with a high ceiling case. With a significant space between your heatsink and the top of the case you can't really get that straight-through airflow that a wind tunnel requires. Instead, you have a system that acts like a bagpipe. In such systems, if you have both positions filled with intake fans you will get superior results.

What would you consider a high ceiling case? How much distance would you say between the heatsink to the top fan?
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post #1209 of 2110
Quote:
Originally Posted by ehume View Post

This is where a low ceiling case can produce a wind tunnel effect. You're pushing air from the front of the case to the back with the cpu heatsink standing in the way, where it benefits from the breeze. Putting a fan in the rearward top position can actually interfere with front-to-back airflow.

This approach is not helpful with a high ceiling case. With a significant space between your heatsink and the top of the case you can't really get that straight-through airflow that a wind tunnel requires. Instead, you have a system that acts like a bagpipe. In such systems, if you have both positions filled with intake fans you will get superior results.

I agree. I started with a prejudice against Slip Streams. But the more I used them the more impressed I was. Now I am a fan of Slip Streams.

I only want to see two changes: an FDB bearing in place of the sleeve bearing they now have, and a change in name to 'Slipstream.' biggrin.gif

Are these Slipstreams hard to obtain nowadays? So 800RPM is the most recommended?
post #1210 of 2110
Has anyone ever had any experience with the Scythe Ultra Kaze? they're rated at 3000 rpm, 45.90dBA, 133.60CFM. I was considering 2 of these for intake fans in the front., and either upgrading the 140mm top intake or leaving as is. The rear top fan slot will be blocked off.
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