"joanne fee" <joanne.fee.DeleteThis@ntlworld.com> wrote in
news:c%Lpj.2677$zg.58@newsfe5-win.ntli.net:
> Dear all,
>
> Fitted a new CPU to my system and decided to get rid of my old beige
> tower case and get something more modern. I fitted all my bits as
> follows to the new case.
>
> GA-KANF-9 mobo NF4 drr 400
> AMD 64 4000+ with stock AMD cooler from my old 3200+
> GF 7950gt 512mb
> 2Gb pc 3200 ram
> 5.1 sound card
> 600watt twin fan power supply
> 2x HDD
> 1xDVDRW
> 1x 80mm artic cooling front fan
> ATX tower with front, side and rear fan mounts
>
> All is running ok. I have a smart fan option so normal use is quite
> quiet but I just ran Crysis and after a few minutes it sounds like my
> PC is going to take off!! My old set up never used to run so noisily
> as the fans would only peak for a few seconds before ramping down.
> I get a CPU temp of 45 deg C with the fan at 5000rpm, the GPU at 75
> deg C with the fan flat out and the system fan at 2500rpm.This is in
> an ambient of 23 deg C.
>
> I need some info and advise about reducing these temps without the
> noise.
>
> Firstly does the power supply pull air from the case and out the back?
> My front fan blows over the 2 HDD's will this heat up the case?
> I have a side port near the CPU and GFX card, would it be worth
> fitting a quiet fan hear to put in cold air and keep the CPU and GPU
> fan speeds down? Are there any good passive or slow fan cooling
> options? would a heat extract at the rear near the GFX card and CPU
> help? What is the best cooling layout (air in and out) for a system?
>
> Thanks for any help, in the mean time I will have to turn up the 5.1
> system to drown out the noise.
>
Hot air rises and would collect in the top of the case were it not for the
PSU fan. The PSU fan draws hot air in and exhausts it out the back of the
case.
I prefer a fan arrangement that pulls air out rather than pushing it in.
IMO pushing air in is a ineffective because it is difficult to predict
where that air will exit. The best you can hope for by pushing air in is
that you might get some cooling on a component if the air blows directly on
it.
IMO the best place for a case fan is in the top at the rear. The larger the
fan diameter the better, 120mm is ideal. This is also where the hottest
components are located. If the fan(s) are effective a low pressure area
will be created inside the case and cool air will be draw into the case
through the cooling vents.
The case I use has a 120mm fan at the top rear just under the PSU. It also
has an adjustable duct on the side air vent that channels outside air into
the CPU fan. This air is then blow into the cooling fins on the heatsink by
the CPU fan.
If you play demanding games then fan cooling alone may not be sufficient.
You may need water cooling too.
>> Stay informed about: cooling and noise 
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