Airflow Mythology

SquattingDog · Post by **SquattingDog** » 27 Jun 2003, 11:26

Why do most of the ppl worry about the amount of â€œAIRFLOWâ€ in your case?
 
 Let say for example our case have a volume of 18000cmÂ³, and 40% of that is warm air which in most of the part gets stuck on the top half of your case because some bright oak said warm air rises. Now, we or I want to get rid of all the warm air in the case so we stuck as many fans as we can in the top half of our cases trying to get rid of all the warm air.
 
 Iâ€™ve got a different approach to this. Why donâ€™t you stick as many fans as you can, blowing or sucking the air from outside of your case? The case will get â€œfilledâ€ with the new air and the old air has to go somewhere (up). The power supply should be able to suck most of the air in the top part of your case where most of the warm would or should be and there is more than enough holes, gaps grills or whatever for the new or old air to leave your case.
 
 What Iâ€™m trying to prove or test is simple. If you have a glass of warm water that is filled Â¾ of the volume and you keep filling it with cold water for a certain period of time then eventually you will end up with cold water in the glass.
 
 Iâ€™m almost certain I missed something somewhere but I donâ€™t know what or where. Any Suggestions?

Satan · Post by **Satan** » 27 Jun 2003, 13:59

You should always have more fans blowing cold air into your case that sucking warm air out. This creates a positive air pressures in your case, keeping dust from being suck thru every opening in your case.
 
 It´s also better to provide hot air with and "easier" route of escape from you case, such as a fan sucking out. Otherwise the air will be pushed thru your cdrom which is a no no, due to dust also being pushed thru.
 
 so 4 in, 4 out.
 
 But thats just me.

Satan · Post by **Satan** » 27 Jun 2003, 14:24

PS: SquattingDog you smell funny?!?!?!

SquattingDog · Post by **SquattingDog** » 27 Jun 2003, 14:29

I was thinking of putting 3fans blowing in and 2 out. 1front, 1back, 1side. the two fans blowing would be my PSU fan and an extra fan attached to the PSU at the back to push even more air through.
 
 My PSU as a grill on the bottom so that hot air that rises from the CPU gets sucked in. Bear in mind my CPU (1700+) in idleing at 47C and after gaming 55C.
 
 When I got my new copper heatsink plus fan it was idleing at 41C and after gaming 47C. Just all of a sudden the temps shot up by 6-7C. snowmonkey baught the same heatsink fan solution as me and encountered the same thing.
 
 Could it be that the heatsink compound is shi*ty?
 
 DONO
 
 <IMG SRC="images/forum/smilies/icon_confused.gif"> <IMG SRC="images/forum/smilies/icon_confused.gif"> <IMG SRC="images/forum/smilies/icon_confused.gif"> <IMG SRC="images/forum/smilies/icon_confused.gif">

Satan · Post by **Satan** » 27 Jun 2003, 15:19

If you got a side fan blowing onto your mobo, put a dust filter on it. I had one on my old case blowing onto my ram, was getting some dust bunnies and one very confused cpu (restarting, crashing and hanging). Cleaned my ram, reversed the fan no more probs.
 
 I´ve got a 2000+ sitting idle at 44 goes up to 49 on load, with a <a href="mailto:cr@ppy">cr@ppy</a> headsink (but lapped to prefection) and a 3200rpm cpu fan.
 
 Never use the compound that comes with the heatsink, rather whipe it off and apply your own (artic silver or that stuff from rectron cant remember the name)
 
 You gonna be at the link tomorrow?

SquattingDog · Post by **SquattingDog** » 27 Jun 2003, 15:56

My budget has gone through the drains, I justt bought myself a Gigabyte MayaII Radeon 9700PRO. DAMN, it sounds good when you add al these names.
 
 I´m thinking of going there on Saturday 2 see how many ppl rocked up.
 
 To come back to the airflow/temp thingy. I think my problem is that I used the heatsink compound that came with the package. I´ll take it off 2night and see if the temps drop and stay over a week or so.
 
 It´s funny when 2 boere met mekaar afr. praat. You met Snowy and Ninjatic last weekend, did you not? <IMG SRC="images/forum/smilies/icon_confused.gif">

SnowMonkey · Post by **SnowMonkey** » 27 Jun 2003, 16:03

I´m gonna mod my case this week end. What colour should me spray it? I´m thinking Blue & Silver or Red & Copper? Which will look betta?
 
 PS I hate everyone! <IMG SRC="images/forum/smilies/icon_mad.gif">

SquattingDog · Post by **SquattingDog** » 27 Jun 2003, 16:10

Spray it brown, the same color as your *anus*. <IMG SRC="images/forum/smilies/icon_lol.gif"> <IMG SRC="images/forum/smilies/icon_razz.gif"> <IMG SRC="images/forum/smilies/icon_biggrin.gif">

SnowMonkey · Post by **SnowMonkey** » 27 Jun 2003, 16:14

Satan · Post by **Satan** » 27 Jun 2003, 16:14

that 9700pro is gonna rock!!!!
 
 Just remember compound takes 3 days to "settle" and start giving proper temps, you must also think about lapping your heatsink if you havn´t yet. Make a huge diff.
 
 Yip, snow and tic came over to "borrow" some ................ sugar last weekend.
 
 You also a boer seun???

SquattingDog · Post by **SquattingDog** » 27 Jun 2003, 16:21

Born and raised in the old way.
 
 Sambok on the boude and a castle in the hand. What the hell did you mean by ******the heatsink. do you mean taking of the compound and taking sandpaper and clean the botom of the heatsink.
 
 shhhhesh, these english terms is giving me a headache.
 
 <IMG SRC="images/forum/smilies/icon_lol.gif">

Post by **OnlyOneKenobi** » 27 Jun 2003, 16:23

hehe jou ma hulle het jou nie hard genoeg gedonner nie...

SnowMonkey · Post by **SnowMonkey** » 27 Jun 2003, 16:32

Julle boere is al die selfde! <IMG SRC="images/forum/smilies/icon_biggrin.gif">
 
 
 What is this lapping you talking bout satan?

peterg · Post by **peterg** » 09 Jul 2003, 10:09

My Athlon 2200+ is in a big std 5 bay case with a copper heatsink & AMD approved cpu fan. No other fan besides psu at top of case. Also have a bit of past between heatsink & cpu. CPU idles at 40c and climbes to 44/45 under load.
 
 Strange though, in the PC Format´s cpu 6 processor test, it was stated that the 2200+ was cruising under 40c and crept to 40c under load.
 
 I am confused??????????? <IMG SRC="images/forum/smilies/icon_mad.gif">

SnowMonkey · Post by **SnowMonkey** » 09 Jul 2003, 10:25

It could be a whole bunch of reasons.
 Your Case does´nt have enough airflow.
 
 The heat sink compound is not good. Your heatsink is not tha same quaility. The stepping on your CPU might be diffrent to there´s. They tested in a Airconned room where the room temp is only 20C.
 
 There is so my factors. <IMG SRC="images/forum/smilies/icon_biggrin.gif">
 
 Don´t worry though your temp is still alright.

Satan · Post by **Satan** » 09 Jul 2003, 11:26

Eish....
 
 <A HREF="http://overclockersclub.com/guides/heat ... gguide.php" TARGET="_blank">Lapping for Idiots</A>
 
 L8er

Post by **Synkronos** » 09 Jul 2003, 11:41

Kewl man <IMG SRC="images/forum/smilies/icon_smile.gif"> Interesting read, ta.

SnowMonkey · Post by **SnowMonkey** » 09 Jul 2003, 12:20

Thanks santa it was a good read!
 Did you guys see the flame war afterwards.
 Pretty funny! <IMG SRC="images/forum/smilies/icon_lol.gif">

Post by **Thrall** » 09 Jul 2003, 17:34

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD>Quote:<HR></TD></TR><TR><TD><BLOCKQUOTE>
 On 2003-06-27 13:59, Satan wrote:
 You should always have more fans blowing cold air into your case that sucking warm air out. This creates a positive air pressures in your case, keeping dust from being suck thru every opening in your case.
 </BLOCKQUOTE></TD></TR><TR><TD><HR></TD></TR></TABLE>
 
 Nice in theory - but when you blow the air into your case, dust comes along for the ride. If you had positive pressure in your case, no air would be able to get in - only out.

Tienie · Post by **Tienie** » 09 Jul 2003, 18:07

I have an AMD 1.3 CGZ Duron and although it is onlt a small processor, I get it running at 17 degrees with the panels off with only a processor fan and one extractor fan. With the panels on and with another fan blowing cold air into the case I run at 21 degrees. Beat that!

Satan · Post by **Satan** » 10 Jul 2003, 07:57

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD>Quote:<HR></TD></TR><TR><TD><BLOCKQUOTE>Nice in theory - but when you blow the air into your case, dust comes along for the ride. If you had positive pressure in your case, no air would be able to get in - only out. </BLOCKQUOTE></TD></TR><TR><TD><HR></TD></TR></TABLE>
 
 What goes in must come out, so 4 fans in with dust filters and 3 fans out(no filters) will create a + almost dust free pressure in your case.
 
 <TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD>Quote:<HR></TD></TR><TR><TD><BLOCKQUOTE>I have an AMD 1.3 CGZ Duron and although it is onlt a small processor, I get it running at 17 degrees with the panels off with only a processor fan and one extractor fan. With the panels on and with another fan blowing cold air into the case I run at 21 degrees. Beat that!
 </BLOCKQUOTE></TD></TR><TR><TD><HR></TD></TR></TABLE>
 
 Tienie welcome to the forums. My old 1ghz duron use to ran 15 idle/ 20 load with an ambient temp on 13 (winter time) with the covers on. Get an XP and we will talk again.
 
 L8er

CrazedFerret · Post by **CrazedFerret** » 10 Jul 2003, 09:13

Dunno what I´m doing right, but my XP 2200+ runs at 34 idle, and 40 under load. I´ve got an Evercool hsf (only cost R100), and two case fans both blowing air out.

Satan · Post by **Satan** » 10 Jul 2003, 13:16

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD>Quote:<HR></TD></TR><TR><TD><BLOCKQUOTE> Dunno what I´m doing right, but my XP 2200+ runs at 34 idle, and 40 under load. I´ve got an Evercool hsf (only cost R100), and two case fans both blowing air out.
 </BLOCKQUOTE></TD></TR><TR><TD><HR></TD></TR></TABLE>
 
 What the ambient temp in your case,34 doesn´t help if you stay in bloemfontien where it gets like -5.

CrazedFerret · Post by **CrazedFerret** » 10 Jul 2003, 13:35

Hmm, dunno bout my ambient case temp; can´t check coz I´m at work (or should i say ´work´) right now. I stay in Jhb though, so I don´t think the surrounding temp has much to do with it.

SnowMonkey · Post by **SnowMonkey** » 10 Jul 2003, 16:24

What he means buy abient temp is the room tempreture!!!!!
 Of corse it makes a diffrance a huge diffrance.
 My P4 1800 PC in my office runs 29C when the aircon is set to 17C if the temp is set to 24C the temp of the computer rizes to 37. so hell yeh it makes a diffrance!