Steve W said:
Are there any good documents on airflow and cooling for PC builds?
ten years ago my power supply would have been 200W now its 550W. Big
step up in power requirement.
But the case design is largely unchanged (I am using a new case BTW),
video card now has a fan, CPU has its own fan which sort just swirl the
heat round and round inside a hot box!
I've added a fan to the case - but that's an ignorant attempt at doing
something it feels right should be done. I'm running just one 250Gig SATA
with space either side and that runs hot - need another what are the rules
from the heating consideration point of view? Can I stack them together
and let them really hot? What is "really hot" anyway?
OK, first, you want airflow inward to match, or exceed airflow outward.
Your power supply will have a fan or two drawing air outward. So if you add
case fans, you should start by adding one to pull air inward. Case fan
number 2 should also be pulling air into the case. If you add three case
fans, then the third one should be located near the power supply, sucking
air out of the case. Another thing to remember is that you generally want
cool air entering from a low position and hot air exiting from a high
position.
Oh, while most video cards have a fan, they don't all have one. Probably
10% of video cards on the market are passively cooled, meaning just a huge
heatsink (or 2 or 3) but no fan. Unless you are a hardcore gamer or intend
to overclock the video card, I would suggest you buy a passively cooled
video card. The cooling fan on a video card is often the LOUDEST component
in a PC.
http://www.gigabyte.us/Products/VGA/Products_Overview.aspx?ProductID=2226
Many will say that you need a cooling fan just for the hard drive. I think
that's overkill. The only hard drives I've seen that failed were ones in
external enclosures that build up a lot of heat. To keep your system quiet
and reliable, I'd suggest two hard drives, with one being used (at least
half of it anyway) as a backup for the other one. See Acronis True Image.
You're right to be thinking about cooling now. It's not hard to cool a PC
case. What is difficult now is keeping the case cool AND QUIET. Read
reviews, find quiet case fans. They are worth the extra money. Find a
quiet power supply. You should be investing in a high-quality power supply
anyway, so a quiet one won't cost more. Get a passively cooled video card.
Find a mainboard with NO fan on the northbridge chips. If you plan this
right, the only fans you should have running are the quiet one(s) on the
power supply, the fan on the CPU (no way around that, without water-cooling)
and a couple of ultra-quiet ones on the case. And your system will stay
nice and cool. -Dave