FX-8370 Voltage and Frequency Throttling

[The_Man12]

Hi,

I recently had to undervolt my FX-8370 to 1.2 Volts. The motherboard (Asus M5A99FX Pro R 2.0) wanted to run it at 1.296 and it just got too hot when stress testing with Prime95 (cooler is Cooler Master Hyper 212 EVO), they would go all the way up to 65~68C (socket). Now that I successfully undervolted it to 1.200V, socket temps are about 60C when stress testing which is much better.
Now. Using HWMonitor, I noticed that under load the CPU Voltage is a little higher (1.212V) than when it's idle (1.2V), and sometimes it'll move around between those voltages. Is that normal? Also, I noticed that the CPU Frequency sometimes goes down to 3998Mhz for like half a second and then comes back up and sometimes it'll go all the way to 4024Mhz. This happens only for like half a second, then it goes back to 4013Mhz. It varies between that, but it doesn't go higher or lower. Is that normal too? The computer runs great! I mean, no lag, lower temperatures (which allows me to overclock now), but that's just didn't seem right to me.

What do you guys think?

Thanks!!

 

[ShadyHamster]

I would avoid stressing with Prime95, i recommend using AIDA64 and using the built in stability stress test.
The max safe temp for the socket is 70 degrees while the max safe temp for the cores is 62 degrees.
The voltage will always fluctuate a little bit, adjust LLC if you want to lower the fluctuations, but it will most likely always change when going from idle to load.
The clock speed jumping around like that is from the FSB fluctuating a bit, this is normal too.

 

[The_Man12]

Oh okay. I thought I did something wrong. Thanks a lot!