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High Northbridge temps - what can be the cause?

post #1 of 4
Thread Starter 
I have been noticing rather high temps on my mobo probe.
I'm guessing the mobo temp that shows on Asus` "Probe" software corresponds to the Northbridge because when I opened my side panel and touched the NB with two fingers I couldn't keep them on it for more than 3 to 4 seconds. Yes it's that hot !
Can this be due to the fact that I lately switched to water cooling ? I mean when I was using Intel's stock hsf there was a fan blowing on the CPU and on the NB all together... and now that there's a water block on the CPU with no fans the NB is just getting too hot ?
My room temp is 25C and the motherboard displays a temp of 38 at idle and it reaches 42 during games.
The CPU however idles at 29C and doesn't go over 40C during games.
Does this high NB temp have anything to do with the PCI-E bus being set at 106 MHz ?
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post #2 of 4
im uh thinkin that you should have a heasink on the northbridge unless you want to burn somehing up, also you could rout a hose from your water cooling to your northbridge and that would lower temps alot
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AMD Opteron 165 CCBWE ASUS A8N5X evga 7900gt gskill hz ddr500 
Hard DriveOptical DriveOSMonitor
wd 250gb asus dvd dl +_rw windows vista 32 ultimate dell 17" lcd 
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dell stock Aspire 520w Dell xps D233 dell stock 
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post #3 of 4
if you no longer have a cooling source for your northbridge (via the active cooling on your cpu), you might want to get some active cooling for your northbridge. Just like your cpu, too high off temps on your NB can be bad as well. It won't increase your OC by much, but it'll make your system more stable, and will run it cooler too.

try the Swiftech MCX159-CU, I'm thinking of getting on too
post #4 of 4
Thread Starter 
All right I couldn't find the Swiftech MCX159-CU since I don't live in the US or in Europe. But I have a friend who lives in San Fransisco so I'll send him an email to check it out for me. If any of you guys lives there and knows the name of a shop where he can get it for me then I would really be grateful.

Meanwhile, I got myself a small 45mm fan (Sunon KD1245PFS2). I took off the NB heatsink and cleaned it (as well as the chipset itself) and applied some AS5. Then I adapted the 45mm fan to the NB heatsink and it perfectly fits. I was able to insert 4 large screws and it's holding in place pretty well (no vibrations and no weird sounds although this little fan rotates at approximately 5000 rpm.
I was checking out Swiftech's webpage and I noticed they use a similar fan (same brand but different model) on their MCX159-CU chipset cooler.

Temps have dropped by 4C which is pretty good considering I'm still using the same crappy Asus NB heatsink. I'm also waiting for AS5 to cure (a week or so) since it has only been a few hours since I applied it.

Like I previously said. I'm assuming this sudden raise in MB temps (according to Asus` Probe II) is due to the fact that I recently installed water cooling. This means I had to take off the Intel stock HSF which was probably cooling the CPU and the NB (passively) at the same time.

Before I installed the 45mm on the NB heatsink my MB temps would reach 43 - 44C. And when I would feel the NB heatsink with my fingers it would be pretty hot (gives you a slight burning sensation after 3 or 4 seconds).
After I installed 45mm fan my MB temp stabilized at 38C when I was playing AoE3.

Still have a question though (please don't answer unless you're certain about
the numbers you will give).
What's the max safe MB temp (also according to Asus` Probe II) that I should allow ?
I'm worried that when summer arrives I'll get higher temps.
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P4 630 3.0GHz Asus P5LD2-VM Windows XP Pro (SP2) Viewsonic VX-724 (LCD) 
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Antec TruePower II 480W TT SViking (modded) Logitech G5 +TT Gamma Pad 
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My System
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CPUMotherboardOSMonitor
P4 630 3.0GHz Asus P5LD2-VM Windows XP Pro (SP2) Viewsonic VX-724 (LCD) 
PowerCaseMouse
Antec TruePower II 480W TT SViking (modded) Logitech G5 +TT Gamma Pad 
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