Athlon XP 1700 CPU,,, Coolermaster HS and fan,,,runs around 51c most of the time,,,Shuold the HS fan be blowing onto the heatsink or drawing heat away from the heatsink,,, TY guys !!!!!
Is this the skived aluminum stock heatsink? Anyway, it should always blow down. Most heatsinks (excluding pin-fins) need an impingement blast for optimal performance.
blowing- the velocity of the gas creates a lot of turbulence and it "reacts" with the surface of the fins more violently to remove heat. If you really want to get jiggy with it, you can make a shroud around the bottom of the sink and then pull the stagnant air out of the case. This will not only improve the cooling performance of the heatsink, but will keep case temps down too. It lowered my CPU temps 2-3 degrees, and my 1800XP is running around 51 right now (only because ambient is 86F- hm)
I've never seen any HSF that draws air away. It's always blowing to the heat sink.
What really makes a good heat-removing system is a shroud that cups the fan on one end and the case exterior on the other end. That way, the fan only draws fresh cool air; and fan doesn't need to spin that fast.
Alpha heatsinks are the only ones I know of that draw air away from the HSF... All others (that i'm aware of anyway) have the fan pointing so that it blows on air directly on the fins.
Fact is a fan is slowed down less by forcing air past resistance than drawing it. Proof. O.k. How about when I redid my furnace blower system for floor heating. Fan is at furnace and PUSHES it through all the ducts in the entire house! Why-cause the fan has more force on the output side than the intake side. Put the fan at the vent at floor and have it draw the air from furnace once. it will spin half as fast. i know we played around with a induct booster fan system. The closer to the intake filter at furnace (i.e. less resistance as less distnace travled to outside air) the more powerfull it was. Dont get me wrong intake and exhaust cfm's are the same. The dif is the power of motor. it can push more than it can pull.
Hmmmmmm,,, This has been a real interesting thread,,, Thanks to all for your input,,,What I decided to do is modify my case and put an 80mm fan assembly on top of the case drawing air in just above the HSF where the CPU is,,,That should drop the CPU temp about 5c degrees,to about 45c from 51c,,,
Athlon XP 1700
Asus A7N266-VM
256 mb Crucial DDR 2100 RAM
Maxtor 60 gig HDD ATA133
Sound and graphics are Integrated on Motherboard
w/ Nvidia N Force 2 Chip sets,, 6 channel digital Dolby Stereo
and 3-D graphics
Panasonic DVD/RW-W CD ROM
Sony 3.5" floppy
Antec Super case w/400 watt switched Power supply
Round cables for air flow
Originally posted by causticVapor Most heatsinks need an impingement blast
I Like that term "Impingement blast" .......... Was that not what happened to Bill Clinton tho' ......... Easy way to remember it tho.......Align it Lewinsky fashion
just agreeing to Slitelyused's post, i have done exacly that, but with a 105cu/ft min 120mm sanyo fan.
it is probably the nosiest computer ever but who said a rheobus wasnt possible.
by the way the computer was made for under $150 US and has
750duron@950 (cough), ASUS A7A 266 , 256mb DDR,TNT2 m64 (cough), 10.2barracuda + 1.2 caviar raid 0, 11 fans in total and the case air is refreshed about 1 1/2 times every second.
The case is an old IBM AT case! - a real pain to fit and mount everything into!
i have also seen ppl use plastic cups to focus air from 80mm's down onto their dual processing beasts - a vry easy thing to do!
Case runs @ room temp (what a suprize!) CPU temp is 10deg above room @ full load
crazy and dusty ;D
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"Impingement blast" .......... Was that not what happened to Bill Clinton tho' 
......... Easy way to remember it tho.......Align it Lewinsky fashion 
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