Noisy pc - How to quiet

[Ox1de]

Hi

Recently built a new rig about a month or so ago, but finding it just as noisy (if not MORE noisy) than my old machine.

Old machine was:

Amd64 3500, stock amd cooler
evga 6800gt, stock cooler
Raidmax Cobra case, with all the stock fans and the psu that came with it
Abit 3rd eye mboard

..now that was pretty loud, and i though my new machine would be much quieter;

Amdx2 4200 , zalman CNPS7000
Asus a8n-sli SE
Lian Li 61 - havnt even hooked up the fans
XFX 7900gt, stock cooler (think this may be the culprit)
Tagan 530w "silent" psu

Also, I have a 74gig raptor and 250gig hitachi HDD, but its not those causing the noise because I disconnected them.

What can I do to quiet this down? vf900 on the graphics card?

 

[SiriusB]

I use ITE SmartGuardian and ATi Tool on my CPU and X1900XT respectively to control fan speeds based on temperature.

When idling my CPU never usually goes above 34C so I tell my fan to switch off below this temp. If it goes above I get it to run at just 25%, so it will be cooling but because its such a good fan [AC Freezer 64 Pro] its almost silent. Only time it goes full wack is if it reaches 40C.

The same applies to my graphics card. Only if it reaches 55C does it go 100% speed. Rest of the time its near-silent at just 25%.

The only thing letting down my system is the 4 case fans. As it is at the moment theyre running straight off the PSU so I can't control their speed. When I have some money I hope to get a fan controller and set their speeds much lower when I need quiet.

SiriusB

 

[squiffy]

What is making the most noise? Take the side panel off and have a listen. Not worth replacing everything, but if one is loud (ie a Delta crossflow in a already quiet HTPC) get a big reduction replacing the loudest part.

check it's not mobo chipset fan, heard that particular mobo has unreliable fan.

 

[Day03]

The loudest part is probably the graphics card cooler. Get something like a Zalman or Arctic Silencer. I prefer the Arctic Silencers as they blow the hot air outside the case and thus act as addtional exhaust fan.