[Speakersrock]

Right!, thanks for that!, I have never know the right way to put them in lol!....I'll have to go change all mine around now!
-Does make sense when you think about it logically like that I guess.

Im glad to hear its not just me who find the front fans ineffective!, I have a couple of boxes which are the same, the only place for a fan is in the front, and I do think I have seen any difference besides increase noise since I put the front fans in! (might be partly because I think they are blowing out at the moment! lol )

Anyway, Thanks for clarifying that, and the extractor thing as well everyone. This thread has been really useful to me. Thanks.

[JohnWill]

I actually removed the front fans from two full size towers, and it decreased the temperature of the MB about 4C, so in that case, they were really ineffective! Sometimes, I believe they cause turbulence in the case and actually create hot spots. It's desirable to have smooth airflow. Cable dressing will have a big impact in case temperatures, especially the flat IDE and floppy cables.

[Speakersrock]

Ok, good advise there, Thanks.
I will remember that, but whats cable dressing?!

[JohnWill]

"cable dressing" is simply the intelligent routing of the cables. In the case of the flat cables, keep them tied together and out of the main airflow if possible. I've also been known to roll them up more like round cables to minimize the airflow disturbance they create.

[Speakersrock]

ohh right!, that makes lots of sense, thanks, I already mostly do that!, so know I know what its called!

Thanks!

[hewee]

My case had two fans. One blowing out in the back that sets below the PS and beside the CPU. The other was on the side that blowing out.
I then added one to the front that is at the bottom.
But testing the temperature of MB and CPU I got the temperature down more after I turn the side case fan around to blowing out.
Plus now after getting a new PS it has a fan on the buttom to help suck heat out also along with the fan in the back of the PS.

[Speakersrock]

Originally Posted by hewee

My case had two fans. One blowing out in the back that sets below the PS and beside the CPU. The other was on the side that blowing out.
I then added one to the front that is at the bottom.
But testing the temperature of MB and CPU I got the temperature down more after I turn the side case fan around to blowing out.
Plus now after getting a new PS it has a fan on the buttom to help suck heat out also along with the fan in the back of the PS.

ooh, thats a gooden, the PSU with a suction fan lol! ....But if it sucking in more warm air, isn't there an increased fire risk?
Are they substantially much more to buy?

ahh, I will remeber that, usefull to know!

My Identical 2 pcs have big heat problems, always getting fairly hot, prehaps if I get a PSU with a suction, and turn the front fan around the right way, it might solve the problem!!

Thanks again.

[hewee]

Well the last PS you could touch the side and feel the heat so it was a whole lot warmer then the one I got now that feel just a very little bit warm. So it has to also help the heat that rises up from the CPU sucking out any of that added heat that the other PS could not do.
No I don't think it cost more to buy then other. If it was more it sure was not that much. I got a fan by brand name and the amount and was not looking for a cheap one.
So if you got a side fan turn it around and see if it helps.

[JohnWill]

Since a computer P/S runs at the most about a 75% efficiency, if your machine is actually drawing 200 watts for it's operation, there is over 60 watts being dissipated inside the P/S. That's why P/S cooling is so important, there's a lot of heat in a small space to get rid of.

[Speakersrock]

hewee, Thanks, usefull info again there.
I don't have a side fun (but then again, I don't know how to install a side fan!)

I do have front fans though, so it'll proberbly help turning these around I guess lol!


John, thnaks, I had never looked at it like that, I think Im going to go and downgrade all my PSUs now to save on power consumption!


Thanks.

[JohnWill]

Downgrading the power supplies won't save any power. The P/S only supplies the power demanded of it, so a larger supply won't use any more power than a lower capacity one. If you really want to save energy, shop for the highest efficiency supply that is large enough to supply the system demaind.

[hewee]

I would not turn the front fans around because they need to suck air into the case.
Like John said your only use the power needed from the PS.
PS that come on many pre-build computer are under power. Well the power is OK for the computer and a printer but say you add other things like scanner, another drive, DVD etc then your need more power. Plus if you have all the things running at once you want to have the power for that.

Here is some info and a Power Supply Calculator.
http://journeysystems.com/?powercalc

[Speakersrock]

Oh right!, I didn't quite think about that, but it does make sense!, thanks! - and yeah, I will remeber that.

yeah, sorry If I have not explined properly, that is one of my problems, I have installed my front fans the wrong way around!, they are blowing rather than sucking :S

Ok, yeah, thanks for that info again, and also the calculator site, really useful, thanks.

[hewee]

You bet it is a problem because you want the cooler air outside the case to come in the front and then the hot air going out the back.

[Speakersrock]

ahh right lol!. I'll change it around tnoight/ tomorrow and post back with what differnce it makes!!