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Old 2012-06-20, 19:39   #1
Eep
 
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Default system temperatures still high after stress testing with Prime95

Just tried Prime95's stress test and my temps raised to around 95C for CPU and motherboard, and PSU 77C but when I quit Prime95 the temps didn't go back down (even blowing a desktop fan on high on the open computer case didn't help). I don't understand why the temps wouldn't go back down when CPU usage is minimal and Prime95 isn't even loaded anymore.

Even after a complete shutdown, unplug, and dust blowout (not much on the CPU heatsink), the CPU, motherboard, and PSU temps are still the same. WTF? All the fans are working fine too so I don't know what Prime95 did to screw up my system but SpeedFan and Hardware Sensors Monitor both give the same temps (and Speccy gives the same motherboard temp).

How could Prime95 have done this, if at all? And if not, what would be the cause since the temps were fine before I ran Prime95 to stress test my system??
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Old 2012-06-20, 20:57   #2
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A complete and total shot in the dark here, but perhaps you blew out the temperature sensors?

If the temps got too high for the sensors, it's plausible that they'd just keep sending the last correct temp before they died.

Last fiddled with by Dubslow on 2012-06-20 at 20:58 Reason: s/blow/blew/
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Old 2012-06-20, 22:06   #3
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Hmm... what CPU?
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Old 2012-06-20, 22:43   #4
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You need to confirm that you did not do a normal install on Prime95 (this is my best guess). That would normally make it restart on boot and when you hit the X to close it, it just minimizes it to the tray. Try using the Start button to run Prime95 again, if it comes up and shows that it is already testing, that is your issue. You will need to either change the settings so that it does not start on boot, or go to the Test menu, hit exit, then you can delete or uninstall Prime95.
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Old 2012-06-20, 22:45   #5
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Seems I was dorking with the sensor types (diode, transistor, thermistor) in Hardware Sensors Monitor while Prime95 was running and didn't realize different sensor types give different results for some reason.

If I change sensors 1 or 2 to diode or transistor the temps are around 95C. If I change sensor 3 to diode the temp is 36C but with thermistor it's 76C. But what's odd is SpeedFan's temps are immediately affected, which I wouldn't think would even be related since both separate programs have their own separate sensor settings. I don't know what the temps pertain to either since, in HSM anyway, I can choose from different labels (CPU, CPU1, CPU2, M/B, PSU, Power, Chassis, Mainboard) for each sensor and the temp doesn't change when I choose a different label. (Some of the labels also seem redundant like M/B and Mainboard, and PSU and Power.) Anyway, I don't know what the temps are relating to but I can get the sensor back to what they were saying before I started dorking with them the same time I ran Prime95. I may still have an overheating issue but it's hard to tell now since I can't even trust the damn temp monitoring programs!
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Old 2012-06-20, 22:51   #6
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CPU is Pentium D 820 (2.8GHz) and I didn't do a normal install; just extracted zip and ran--it doesn't start with Windows either. Like I said, Prime95 was completely quit and not running yet the temps were still the same but it was because of Hardware Sensor Monitor's sensor types.
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Old 2012-06-20, 23:09   #7
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Damn, I wish intel would tell me the max recommended temps for their cpus... although I know over 80 is... high for any cpu.
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Old 2012-06-21, 00:23   #8
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The later generation Intel procs ought to be able to go past 85C, but yes, 80C is pushing it for any CPU. I don't know anything about the Pentiums though, but it seems like this one at least has a high tolerance.
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Old 2012-06-21, 03:58   #9
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http://ark.intel.com/SSPECQDF.aspx
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Old 2012-06-22, 19:41   #10
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Quote:
Originally Posted by Xyzzy View Post
That shows you more than everything you need to know, except max temperatures.
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Old 2012-06-23, 00:54   #11
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Actually, TDP (thermal design power) is the max temp. So my Pentium D 820 (BX80551PG2800FN) has a TDP of 95C degrees. I believe "Temp3" in Hardware Sensor Monitor's sensors pertains to the CPU and the other sensors are the northbridge (which has a heatsink but no fan--even blowing a fan on high speed against it doesn't seem to affect the temp reading) but I'm not certain. I could still have an overheating issue but not sure since I can play Crysis 2 on "advanced" graphics options fine without any freeze/hang/crash yet Oblivion and Fallout 3 have given me problems. See this Tom's Hardware forum post for more info.
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