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Case flow abnormality?!?

post #1 of 9
Thread Starter 
Well lately I've been thinking about trying to break the 4ghz mark with my P4 3.0. So far the best I've been able to get is 3.86ghz with idle temps in the 45C range and at full load in the 55-58C range. This is too high for my tastes so until I get the cooling straightened out I've backed it down to 3.5ghz. At 3.5ghz it sits are 35C at idle and 41C at full load.

Now I've been thinking about getting a Big Typhoon since I'm still using the stock Intel HSF but... after reading the numerous posts on proper air flow through the case I've noticed that there seems to be a abnormality in setup of my system.

Currently I have 1 80mm on the top of the case for exhaust, 1 80mm side panel over the CPU as intake and a 120mm on the back of the case as intake. According to what I've read this is backwards and should result in a positive pressure case. BUT, during testing when I switched the 120mm to exhaust the temps rose 5-7C. This boggles my mind.

Now the question is how is this happening?! And what is the best course of action to further reduce temps so I can break 4ghz. If I go to a Big Typhoon I imagine it will only increase the positive pressure in the case. On the other hand if I go to a Artic Cooler Freeze with the HSF intaking the same direction as the 120mm and moving towards the top exahust fan.

Any suggestions?!
    
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post #2 of 9
use the 120 in the back for exhaust, then take the 80mm in the back and move it to the fron for intake ,a nd keep the side fan as intake where it lay... and of course get the big typhoon!!!!its a must, unless u go WC
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post #3 of 9
Thread Starter 
No 80mm in the back, only top and side. As for using the 120mm for exhaust rather than intake, doing that raised my temps. The only explanation I have for that is that the intel HSF is inadequate and the 120mm was cooling the heat sink faster than the intel HSF.

The more I think about it I lean towards the artic cooler. The more air on the heat sink the cooler the cpu should run, provided I can vent the hot air. At this point it seems the top mount exhaust is handling that sufficiently. Although, fluid dynamics has never been my strong suit (yes, air is considered a fluid, had to state that to prevent getting flamed)

Let me know what you think
    
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post #4 of 9
ok take a quick look at this... this might help you with the case air flow thing...http://www.overclock.net/other-cooli...-1-inside.html

PS: the big Typhoon is the BEST cooler u can find for air cooling,combined with some arctic silver and proper case airflow, it will drop your temps dramatically...
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post #5 of 9
Yeah you dont want to run your rear fan as an intake, because it will affect your PSU and case curculation, the back fan needs to pull air out of the case, the side fan needs to push air into the case, and the top fan needs to pull air out, proper air flow through the case starts front the lower front coming in and exiting out the upper rear of the case. Your set up is backwards, and Im sure your HSF is not up to par with the Overclock. If you plan to change the HSF go with the Big Typhoon, it dropped my temps by 8.C idle and 15.C under load from before.
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post #6 of 9
Thread Starter 
I understand the 120mm in the rear should be set as exhaust, but like I said, when it was set that way my temps rose and I'm trying to figure out why.
    
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post #7 of 9
you need to get a fan and put it in the front of your case, then set the back fan to exhaust.
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post #8 of 9
Quote:
Originally Posted by Whodie
I understand the 120mm in the rear should be set as exhaust, but like I said, when it was set that way my temps rose and I'm trying to figure out why.
The reason is because you are no longer pushing air over the CPU(Im sure you know that) The answer would be like Ive said above, is that your stock HSF is not up to the task of cooling the CPU right(your big fan in the back is cooling more then the CPU fan is. Buy a bigger Copper HSF like the Typhoon or something similar, your temps will drop dramatically, and you also need to run a fan up front as an intake. If nothing else, just get some arctic silver 5 thermal compound, that will help a bit.
Just one more thing you might notice a big noise decrease when the rear fan is used as an exhuast instead of an intake.
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post #9 of 9
Thread Starter 
Well, I imagine I'll find out soon. Artic Freezer 7, 2 more 80mm case fans, and a new PSU to power it all will arrive Monday. Then it'll be time to unleash this beast
    
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