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Upgraded case and system temps actually went up. What's up?

post #1 of 11
Thread Starter 
So here is the deal, I've been running my equipment in a Cooler Master Centurion 532 for roughly 5 years or so.

http://www.coolermaster.com/product.php?product_id=24

This week I upgraded finally to a Cooler Master CM690 II Advanced.

http://www.coolermaster.com/product.php?product_id=6638

Originally in the Centurion I only had 2 120mm fans (Evercool) and my overal System Temp (which reads as TMPIN0 on HWMonitor) would read around 28-35C. However, after putting everything in the CM690 II with all the cable management, 140mm front fan, 120mm bottom fan, 120mm fan in the 5.25" drive bays, 120mm rear fan (exhaust), and 140mm top fan (exhaust) my System Temp is around 39-40C and goes up slightly during stress. Thing is, my other temps either stayed the same or slightly improved over the old case despite the increase in the System Temp.

Question: What's going on here? Bad fan placement? Not enough air moving through?
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post #2 of 11
Could you compare temps from Aida64 to Hwmonitor and see which temp you are looking at
post #3 of 11
My first instinct is that your have positive air pressure. You're filling your case with air faster than it can remove it. Your old case had 2 equal fans creating even pressure, so his new case needs an even amount of intake vs exhaust fans as well. Looks like you need a 120mm exhaust to make it even again.
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post #4 of 11
Thread Starter 
Quote:
Originally Posted by PontiacGTX View Post

Could you compare temps from Aida64 to Hwmonitor and see which temp you are looking at

Aida64 actually wasn't reporting my temperatures, and the only temp readings i was able to find were for the individual cores. Like I said though, in my Bios that sensor reads as "Computer System Temperature."
Quote:
Originally Posted by InfernoReaper View Post

My first instinct is that your have positive air pressure. You're filling your case with air faster than it can remove it. Your old case had 2 equal fans creating even pressure, so his new case needs an even amount of intake vs exhaust fans as well. Looks like you need a 120mm exhaust to make it even again.

I was actually wondering this. I was just surprised that upgrading to a case with far more ventilation would cause the System Temp to go up like that even with positive air pressure. I'm really curious as to where the sensor is that registers "Computer System Temperature" in the bios. Is it the Northbridge, Southbridge,...?
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post #5 of 11
I can see how that would be aggravating. If you like, I think a photo of the case showing fan/component placement would be illuminating.
    
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post #6 of 11
Quote:
Originally Posted by Bruizer View Post

I was actually wondering this. I was just surprised that upgrading to a case with far more ventilation would cause the System Temp to go up like that even with positive air pressure. I'm really curious as to where the sensor is that registers "Computer System Temperature" in the bios. Is it the Northbridge, Southbridge,...?

Actually, the more fans you have, the harder it can be to keep a balanced airflow. It really depends on your motherboard but it's usually a safe bet around the southbridge.

Two things I also noticed. First, and not a big deal, but your case is longer, so the fan pressure blowing from the front is slightly reduced. Second, and much more noticeable, is your PSU location. Assuming it's your TX650M, that is probably pulling a good amount of your fresh, cool air from the front/bottom intakes. In the old case, it only pulled the rising hot air from the top.
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post #7 of 11
Thread Starter 
Here are some pictures:

450
450
450
450
450

As for the PSU at the bottom, it pulls air through a filter right underneath it.
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post #8 of 11
I wouldn't worry about your temps honestly. Your system temp sensor is probably right above your video card and your new case doesn't have a fan blowing right on it. Definitely a positive pressure airflow; throw a 120mm on the side panel to even it out. I wouldn't recommend putting another fan on top because it will just waste all the fresh air from your 5.25" bay fan.
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post #9 of 11
Quote:
Originally Posted by InfernoReaper View Post

Your system temp sensor is probably right above your video card and your new case doesn't have a fan blowing right on it..

yeah that actually makes sense, since the other temps are ok. smart thinkin'.
    
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3570k@4.5ghz 1.21v Gigabyte Sniper M3 Sapphire 6950 Samsung 8g1866 
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CPUMotherboardGraphicsRAM
3570k@4.5ghz 1.21v Gigabyte Sniper M3 Sapphire 6950 Samsung 8g1866 
Hard DriveHard DriveHard DriveCooling
Samsung 830 Samsung F1 500 Crucial M4 64 (SRC) cpu:Noc NF-F12 / case:4x TY-141/gpu: 2x NB-Multi 
CoolingOSMonitorKeyboard
Venomous X, Accelero TT Win 7 64 Acer X213H Saitek Eclipse 
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post #10 of 11
There is nothing wrong with positive air flow at all. There's even a whole thread about how to run a case with optimal airflow with no exhausting fans here. I used to have my case running in "balanced" airflow with top exhaust, but when I switched them around and used only the back fan as exhaust it dropped my cpu temps by 5C. Moving one of the top intake fans to a front intake in the 5.25" drive cage dropped my GPU temps 5C without affecting my CPU temps.

What I'm actually seeing is you have too much exhaust behind your heatsink. The top exhaust and rear exhaust are perpendicular which just causes turbulence and decreases flow, and both those 140mm fans are overpowering the one 120mm on your heatsink. I would suggest taking your top exhaust and moving it one spot forward and turning it to intake. Then block off the top back fan slot. If you have the extra fan, putting an intake over your GPU should help as well. Also, remove as many of the grills on the back of the case as you can. Things like random PCI slot covers just obstruct airflow out of the case.

More so than in other areas, case airflow is strictly a your mileage may vary situation. Everything from where the case is in the room, how close it is to the wall, is it under the desk or on top, affect your temps and airflow. Literally everything. What you have to do is try out as much as you can until you find temps and noise levels that satisfy you.
Edited by a pet rock - 3/31/12 at 7:27am
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Jane
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