FX8350 strange temps

shadowflex

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Aug 14, 2015
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Ok, so I have the following situation.
This is my rig:
AMD FX8350 w/ Arctic MX4 paste 4.4GHz 1.402V@load (prob could go lower)
Cooler Master Nepton 140XL cooler w/ 1 Noctua IndustrialPPC 140 PWM 2000RPM
Asus Sabertooth 990FX r2.0 mobo
Fractal Design R4 case w/ open side (airflow not a problem) and stock fans
AMD Radeon R9 290 gpu

Here are the facts.
1. I've properly applied the thermal paste.
2. The fans and pump seems to be working.
3. The ambient temp is around 30C.
4. Temps under load with Aida64 are around 60C on the core, 70C on the socket.
5. Gaming with 80% load on average seems to put the max core temps to 69-70C, while the socket remains 70-71C max.
6. Reducing the VCORE@load from 1.465V to 1.403V did almost nothing to the temps, but still stable.
7. CPU fan speed is around 1300RPM under heavy load, and only goes to its max when the socket goes above 70C. I've tried everything (different software, BIOS) and this doesn't change. Stock fans have a more normal curve though.
8. Readings taken from HW Monitor.

Here are my questions:
1) Are these temps safe (meaning no chance of hardware degradation) given the current facts above?
2) If they aren't, what is the problem and how to fix?

I've read in the sticky that according to AMD and Overdrive, the max safe temp of the cores is 70C, but I want your opinion on this, because my situation seems to be different from the other temp threads.

 

shadowflex

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The margin is about 10C in Aida64 at full load, but in gaming it can reach the limit.
 

shadowflex

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The case side panel is open as said in the OP, so airflow shouldn't be a huge issue. I'm pretty sure its installed correctly, the fan is between the radiator and the case and blows air from the back. I'm not entirely sure about a defect, but the cooler is still in warranty I believe. What do you think? Is that why temps don't change when I lower the voltage as said above?

I've also noticed that sometimes the core temp can peak and suddenly go from say 50C to 60C in less than a second when more load is applied, which shouldn't be happening imo, it should be more stable. Same behavior with the stock fans as well.

Is there a way I can test my Nepton's functionality before I send it for RMA?
 
I meant airflow through the cooler. Temperatures can increase very quickly with load. Testing with Prime95 Small FFTs is very good as it allows you to determine if the cooler works properly or not. When working properly, that cooler should have no issues keeping the thermal margins in the double digits.
 

shadowflex

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Well after around 30 mins of Prime95 Small FFTs, the thermal margin stays at about 8C with a few dips to 6C, which is about 62-64C. The fan is running at a 100% and about 1900RPM. The airflow through the cooler seems to be about the same as the 2 stock fans.
 

shadowflex

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Its in the OP.
 

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