Topic Title: Sudden temp spikes with A10-5800K
Topic Summary: System temps stay cool/stable for long periods of time, then temp spikes and system shuts down.
Created On: 03/04/2013 09:29 PM
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 03/04/2013 09:29 PM
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Donny Bahama

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My PC has shut down 3 or 4 times in the last week. Each time, the screen just suddenly goes black and when I restart and check the CPU temp, BIOS reports it as very high.

I ran Memtest overnight and came up with 1600 errors on 5 passes, so clearly the RAM is bad - but is that cause or effect?

This is a fairly new build (< 1 month) with an Asrock FM2A85X, A10-5800K cooled by a Zalman CNPS9500A), and G.Skill Sniper DDR3-2133 RAM with an Antec Neo Eco 520 power supply. After building it, I ran Prime95 for over 24 hours. The system never broke a sweat.

I'm confident that it's not a cooling issue. The Zalman cooler is highly rated, and I've got multiple case fans and good airflow. I monitored temps while running Prime95 and everything stayed nice & cool no matter how hard I pushed. Additionally, I now (since the first temp spike) have the CPU fan maxed out and it's the loudest thing in the system. I'm sitting 2 feet away; I'd definitely hear it if it stopped or slowed.

Nice & cool is the status quo since the initial build (except for these weird episodes). Since this started happening, I've tried to keep my eye on Speedfan in the tray. At the moment, CPU is 85F, System is 82F and HDDs are at 79F and 75F. (GPU reports 27F but obviously that's not accurate.) The machine stays that way for hours - even days - under varying loads. (Even with tons of tabs open in Firefox while simultaneously working on some really huge images in All the while, I'm seeing CPU temps in the high 80s/low 90s. Then, next thing I know, my monitors go black and the system goes into (what I assume is) some sort of protection mode. I immediately restart and check HW Monitor in BIOS and the CPU temp is scary high.

Setting cooling aside, what can cause these sudden CPU temp spikes? I know for sure the RAM is bad (unless Memtest has it wrong) - and the machine never got hot during the memory testing. (AFAIK - it ran overnight and was cool (low 80s) when I checked it the next morning.) Replacement RAM is on its way but I can't imagine how bad RAM could cause an extreme temperature spike - and I'm worried about toasting two more DIMMs.

I can see how this could be a CPU problem, I can also see how it could be a motherboard problem or a power supply problem. How the heck do you troubleshoot something like this if you don't have a spare mobo, CPU & PSU?!

Edited: 03/04/2013 at 09:40 PM by Donny Bahama
 03/05/2013 02:13 PM
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Updated BIOS to latest version ?


an Alpha Geek @ AMD Processors Forums | 01/21/2006 | post count 3217

 03/05/2013 02:40 PM
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A temperature of 90 degrees fahrenheit is unlikely to cause you any problems.  Typically heat doesn't cause a problem until it gets upwards of 60 celcius which is 140 degrees fahrenheit.

As far as CPUs go... most of the time they're either completely fine or completely dead.  Having one that's defective somehow that still works is rare, and if your machine can survive overnight rounds of memtest and Prime95, then it's probably not a power supply issue either.  Swap in the replacement memory when it gets there and re-run your stress tests.  I'm thinkin those problems will go away. 

There are any number of things which can cause spikes in CPU temperature.  The most obvious is increased CPU load from some application.  The monitoring software can sometimes get lost in translation as well, and give you temperatures which are totally off the wall.  I often skip the monitoring software altogether and judge temperatures by touch just by the heat coming off the heatsink.  The heatsink will be uncomfortably or even painfully hot if temperatures really are dangerously high.


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Edited: 03/05/2013 at 02:50 PM by Mime
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