CPU underclocking under load

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maskedmonkyman

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Jul 20, 2013
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Okay so the about two days ago I installed a new cooler Cooler Master hyper Evo 212 onto my AMD fx 8350 CPU and now it when every the CPU is under load it goes from the stock 4GHz to 1.4GHz for about two seconds then jumps back up to 4GHz for about 3 seconds and then goes back down again. According to core temp and HWmonitor my temps are around 30c(but neither program can agree on a temperature) so I don't think its a temp issue and i have gone into the bios and disabled all of the power saving options but still no change i did notice that HWmonitor is reading my PSU's 12v voltage at 7.9 volts but I'm not sure if that's right and if it is would it cause this sort of problem? Any other help or advice would be appreciated.

specs
AMD fx 8350 4GHz
Gigabyte 970A-DS3P motherboard
8GB DDR3 memory
GeForce GTX 770 Gigabyte wind force
2TB HDD
650 Watt XFX PSU
 
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coolcole01

coolcole01

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Oct 24, 2013
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its the cool and quiet feature it thinks its at rest disable it in bios and it will stop downclocking itself if thats not it the actual temp for the cores will be the package in hwmonitor should be under 62 are you noticing any actual performance dips when it does this or are you just seeing it do it
 
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maskedmonkyman

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Jul 20, 2013
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I tried turning off coo and quiet no change, The max value for core temps in HWmonitor was 40c, and yes when im in games (bf4 Metro league SC2) the fps dips when the CPU under clocks to unplayable frame rates for about 4 seconds then jumps back up
 
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maskedmonkyman

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Jul 20, 2013
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According to HWmonitor its at about 40c right before it under clocks then it drops to about 20c and rises back up
and according to core temp it is at about 38c right before and then it drops to 18c and rises back up
 
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ShadyHamster

ShadyHamster

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Jan 3, 2012
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Forget about coretemp it only reads 1 of the 2 temps you have to monitor for amd cpu's

Check out this screenshot:
ikb54y1.png

The temp in red is the socket temp.
The temp in blue is the core temp.

If they are both around 40 degrees when throttling kicks in the vrm's on the motherboard might be getting to hot, that can also cause throttling.
 
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maskedmonkyman

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Jul 20, 2013
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I think you might be right here is a pick of my HWmonitor with prime 95 ruining for about 10 min
7h9rqqo.png

there are 3 temps and I'm not sure witch is the VRM but I would assume its the one with a max of 40
if this is the problem how would i go about fixing it?


 
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ShadyHamster

ShadyHamster

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VRM's usually don't have a software thermal probe (some specific boards do), to get a proper temp reading of the VRM's you would need a infrared thermometer or a hardware thermal probe.

A ghetto way of fixing the problem would be to get a small fan and have it sit over the VRM area blowing cooler air over them, other then that you could try adding some small heatsinks to them, not sure how much that would help though, there is a reason most higher end boards come with beafy heatsinks on VRM's, they get hot, really hot.
 
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Damn_Rookie

Damn_Rookie

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The only little thing I'd like to add to what has already been said is that your FANIN1 reading seems remarkably low at only 306 rpm at its maximum. If this is the exhaust fan, its slow speed may be contributing to VRM temperature issues, if that is indeed the issue at hand. May be something worth looking into, I don't know. Either way, I wish you luck!
 
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maskedmonkyman

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Jul 20, 2013
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I have tried putting the stock cooler back but it is still under clocking(which it dint do before) so i tried changing the air flow in my case to blow cool air over the heatsink but there is little to no difference could something else be causing the underclocking?
 
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maskedmonkyman

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I have that fan plugged into the motherboards system fan header so i don't know what would be causing the low rpm
 
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ShadyHamster

ShadyHamster

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Are you sure it wasn't down clocking before the cpu cooler upgrade? that seems rather odd that it's happening now and not before
 
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maskedmonkyman

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if it was it was NO WHERE near this bad. My performance in games that I used to have no problem playing with no frame drop have now become almost unplayable because when my CPU under clocks my fps drops to like 20, even ones that aren't that recourse heavy. I think I'm just going to call gigabyte and see if they will RMA it.
 
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