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CPU Z shows different voltage than BIOS?

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  • Overclocking
  • BIOS
  • CPUs
Last response: in Overclocking
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December 28, 2013 7:50:07 PM

I'm new to overclocking and I don't want to screw things up. I hit 1.4 volts when trying to stabilize 4.4Ghz on my AMD FX8350. (running an asrock 990fx extreme4). I booted it up and when running prime95, CPU Z said my voltage was 1.3 or so. Why is this? I'm scared of taking the voltage too high since I still can't get it stable at 1.4 V and idk if my 630W PSU will do it (rosewill greenseries). Which one is the real voltage? I'm still not hitting extremely hot temperatures. Max socket was 60 celsius and core 50. Please help!

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December 29, 2013 12:55:45 AM

what your seeing is normal. you should use hwmonitor to see what your min/max reported vcore voltage is from idle and load. there are things like offset voltage or line load calibration in the bios that can help narrow the gap between the bios set voltage and the actual voltage. the only true way to check the "actual" voltage is to use a multimeter on the motherboard. but that shouldn't be necessary unless your a true overclocker shooting for the moon. what cpu cooler are you using? as long as your not going to far over whatever the most agreed on max safe 24/7/365 vcore voltage you should be fine, especially if your temps are well under 80c
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December 30, 2013 9:49:20 AM

my temps havn't passed 60 degrees and im using a hyper 212 evo. Im currently torture testing with prime95 and hwmonitor says that Vcore value is at 1.288, min at 1.288 and max at 1.4
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a b K Overclocking
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December 30, 2013 2:19:38 PM

thats quite a difference between your min/max core. you can use LLC to narrow the gap.
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December 30, 2013 10:02:55 PM

I have LLC at 1/2. That IS what you're talking about right?

BIOS shows. VCore=1.376, Idle Temp of Core 34 celsius.

harware monitor shows: VCore=1.4 (1.368 min 1.4 max), Idle Temp Core 15 celsius (it's 7 degrees Cels. outside where i live at), VCore with prime95 running= 1.296 (and it goes back to 1.4 when I stop the test).

CPU Z shows: VCore Idle= 1.4 V, Vcore with prime95= 1.296-1.3 V (same, goes back up to 1.4 when test stops).

Speed fan shows: Vcore idle= 1.4V, Idle temp cpu (I believe it shows the socket temperature)= 34 celsius, Vcore with prime95 running= 1.3

All Vcores are say 1.4 idle and 1.3 when in stress. BIOS says it should be 1.376. Can somebody explain? :( 

*Stats were taken with AMD fx8350 at 4.4Ghz and a hyper212 evo
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a b K Overclocking
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December 31, 2013 7:49:51 AM

i haven't personally worked much with overclocking the 8350 so someone else should chime in. but jumping a full .1v on the core seems like a big jump. does trying any other levels of LLC help make this change smaller? generally the point is to see a reported max load vcore that is very close to the number you set in the bios. sometimes it doesn't always happen like that so you compensate.
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