Power Supply and Heat-Sink

[arnuld]

I am quite confused on understanding heat-sink and power supply requirements. I have 3 years old AMD64, which I have used a lot and after a little new changes I will have this configuration. The (NEW) means Iit will be a brand new thing going to be put on, everything else is 3 years old:

• AMD Athlon 68 2800+ (1.8 GHz)
  
• ASUS K8V-MX Motherboard
  
• 1 GB DDR2-600 MHz RAM
  
• Logitech Mouse/Keyoard
  
• 22 inch LG/Samsung WideScreen Monitor (NEW)
  
• SONY DVD-ROM (a combo with CD-RW)
  
• ASUS/Samsung DVD-RW (NEW)
  
• Samsung 80 GB SATA + Seagate 80 GB IDE drives (Barracuda 7200 RPM )
  
• HITACHI/Samsung/Western Digital 500 GB SATA (NEW)
  
• ATI Radeon HD 2400/2600 PRO (NEW)
  
• SONY Floppy Drive
  
• Netgear ADSL Modem
  
• NavTech 450W Power Supply
  
• APC UPS
  
• a small fan on the side of cabinet
  
• a Big fan ( as big as AMD64's fan) on the backside of cabinet (NEW)
  

I checked Power Supply Calculator and found out I need 348 W only (keeping the capacitor aging factor in my mind). So my current power supply is sufficient, I wonder what to do about fans , I have one fan on AMD64 processor, which comes as default with the processor, 130 nm i think. Then I have another small one which sucks air from outside and throws it on the motherboard, I want to put one big fan on the back of the cabinet bu I am not sure how to put it, should it suck the air from outside or from inside ?

and what are all those nm of fans ?
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arnuld
http://lispmachine.wordpress.com

[Monkeh]

It won't be a very big fan, considering your heatsink probably has a 70mm..

Anyway, airflow is usually front to back, so if it goes on the back you want it to be an exhaust. However, you'd probably be better off mounting a fan in front of the HDDs, as an intake.

[arnuld]

Corrected the wattage required in OP
_________________
arnuld
http://lispmachine.wordpress.com