Solved CPU

[546 Inspiron]

The fan mounted on top of a heatsink should be blowing downwards onto it. You need the maximum air flow across the fins, and the only way is by positive air pressure. Indeed, if you have a case with a duct over the CPU/HSF assembly, it is not there to allow the warm air generated to exhaust the case - rather it is there so that the fan can pull cool room temperature air INTO the case and across the heatsink.

Try this (you will need an electric fan). With this analogy, the fan obviously represents the fan; your fingers the heatsink; and your body temperature the heat generated by the CPU. With the fan operating, stick both index fingers into some cold water. Hold them, one in front and one behind the fan at equidistant distances. Which finger feels colder? It should be the one that you held up in front, i.e. the one under positive air pressure.

Your anology doesn't hold any water because there is no shrouding. A shrouded fan would PULL cool air from the bottom and through the fins and expell it at the top where the case fan would pick it up (and out). And your fingers aren't in your computer case.

 

[546 Inspiron]

Thanks for sharing your results.

no problem, sorry i could not get pictures, when im tired im sometimes crazy

Thanks for the work and interest. I don't want you to test anymore but was there a shroud? It's all about the shroud.

 

[Phone Man]

Fascinating thread. I got curious so I opened my case and looked at my AMD CPU heat sink and the fan is blowing down toward the CPU. I then pulled a few copies of CPU and MaximumPC magazines and looked at the adds and pictures. In every case the fans were blowing toward the CPU or GPU on video cards. All the adds for after market HSF were setup the same way. So I have to believe that the manufactures have determined that blowing toward the chip is the best. It has been a good discussion and a lot better then "Which AV is Best????" Some disagreement but no one got shot :roflmao:

Jim

 

[cloud8521]

Thanks for sharing your results.

no problem, sorry i could not get pictures, when im tired im sometimes crazy

Thanks for the work and interest. I don't want you to test anymore but was there a shroud? It's all about the shroud.

shrouds seems to be more problematic then helpful.

 

[Kipper]

Wow, what a fun thread.

So, with a little different setup, the SilverStone FT02 chassis which has a 90 degree rotated motherboard placement and running aftermarket air cooling (CM Hyper212Plus) which cannot blow or suck air onto the CPU or away from the CPU I decided to mount dual 120mm fans one each side of the sink. One blowing and one sucking. I figure I have to have the right answer with this setup.

You guys are a blast, seriously a great thread.

 

[YTBOY83]

Wow, what a fun thread.

So, with a little different setup, the SilverStone FT02 chassis which has a 90 degree rotated motherboard placement and running aftermarket air cooling (CM Hyper212Plus) which cannot blow or suck air onto the CPU or away from the CPU I decided to mount dual 120mm fans one each side of the sink. One blowing and one sucking. I figure I have to have the right answer with this setup.

You guys are a blast, seriously a great thread.

Hey i like that idea, do you have a good exhaust fan at the back.????

 

[YTBOY83]

Have a look here http://www.tomshardware.co.uk/forum/170530-11-direction

 

[CarlTR6]

It has been a good discussion and a lot better then "Which AV is Best????" Some disagreement but no one got shot :roflmao:

Jim

:roflmao::roflmao::roflmao:

Have a look here http://www.tomshardware.co.uk/forum/170530-11-direction

Interesting; but not nearly as spirited as our discussion here!

 

[YTBOY83]

I agree, i never knew that my thread would have so much response. I hope it is alive for a good few years yet.

 

[Kipper]

Wow, what a fun thread.

So, with a little different setup, the SilverStone FT02 chassis which has a 90 degree rotated motherboard placement and running aftermarket air cooling (CM Hyper212Plus) which cannot blow or suck air onto the CPU or away from the CPU I decided to mount dual 120mm fans one each side of the sink. One blowing and one sucking. I figure I have to have the right answer with this setup.

You guys are a blast, seriously a great thread.

Hey i like that idea, do you have a good exhaust fan at the back.????

The 90 degree rotating of the MB and the "positive air pressure" of this chassis is quite unique. All intake fans (3X180mm) are bottom mounted with one 120mm exhaust fan on the top of the case.

I wrote a review of this chassis for SilverStone which you can read here:

The SilverStone FT02 Case:

 

[stormy13]

I hope it is alive for a good few years yet.

No problem with that, already been going on for years,

CPU fan, suck vs. blow - Topic Powered by Social Strata

pull or push - Tech Support Forums - TechIMO.com

and came a cross a few even older, just don't remember the exact search terms I used at the time.

 

[CarlTR6]

Another argument that will never die. Some others are -

Which is the best browser?
Which anti-virus is best?
Which engine oil for motorcycles is best?

 

[Product FRED]

I agree. Everyone hit Unsubscribe on 3.

 

[mpcrsc562]

Or how about the venerable argument: Mac vs. Windows

 

[Product FRED]

OSX is a good OS. Better than Windows? In some ways, but not overall. Unfortunately the people that I know that use a Mac are those who don't know how to properly maintain a Windows computer. ie Of course you're going to catch viruses through P2P networks like Limewire if you click anything and everything. Your included AV-subscription is not infinitely long and does need to be renewed or replaced. You should defragment and backup. Etc.

 

[mpcrsc562]

OSX is a good OS. Better than Windows? In some ways, but not overall. Unfortunately the people that I know that use a Mac are those who don't know how to properly maintain a Windows computer. ie Of course you're going to catch viruses through P2P networks like Limewire if you click anything and everything. Your included AV-subscription is not infinitely long and does need to be renewed or replaced. You should defragment and backup. Etc.

Never used Mac OS, so no opinion on it. I'll take your word on it.

 

[546 Inspiron]

Thread being hijacked?

 

[Product FRED]

The thread was over a long time ago. It's all anarchy now.

 

[546 Inspiron]

Fascinating thread. I got curious so I opened my case and looked at my AMD CPU heat sink and the fan is blowing down toward the CPU. I then pulled a few copies of CPU and MaximumPC magazines and looked at the adds and pictures. In every case the fans were blowing toward the CPU or GPU on video cards. All the adds for after market HSF were setup the same way. So I have to believe that the manufactures have determined that blowing toward the chip is the best. It has been a good discussion and a lot better then "Which AV is Best????" Some disagreement but no one got shot :roflmao:
Jim

But how do you know which way they were spinning?

 

[Product FRED]

Fascinating thread. I got curious so I opened my case and looked at my AMD CPU heat sink and the fan is blowing down toward the CPU. I then pulled a few copies of CPU and MaximumPC magazines and looked at the adds and pictures. In every case the fans were blowing toward the CPU or GPU on video cards. All the adds for after market HSF were setup the same way. So I have to believe that the manufactures have determined that blowing toward the chip is the best. It has been a good discussion and a lot better then "Which AV is Best????" Some disagreement but no one got shot :roflmao:
Jim

But how do you know which way they were spinning?

Easy. Put your hand in front of them.