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Voltage troubles?

post #1 of 16
Thread Starter 
Hello guys,

I recently got my Phenom II x3 720BE to 3,6 and stable. I still want to try to get a little higher but ran into something I need some expert advice on.

After reading some about Vdroop/Vdrop I started paying attention to the voltages more closely and this is what I found:

Voltages idle
- BIOS VCore = 1.46250



As you can see the Vcore reported by CPUID / CPU-Z is quite a bit higher then what set in BIOS. So, my board has Vrise

Voltages load
-BIOS VCore = 1.46250
-Prime95 small FTT



Now things are starting to get serious! Under load the Vcore has peaks all the way to 1.54-1.59 (CPUID)

Next I ran a short OCCT to be able to add some more information



Some questions:

- Is it normal to have such a difference in VCore set in BIOS and actual VCore? I read a lot about VCore being lowered, but mine is being automatically raised!

- What do the differences mean? Is my motherboard made of cheap components or is my PSU not up to par?

- In case it could be the PSU; I have a "low-end" PSU which came with my case. It's a Cooler Master eXtreme Power Plus 500W.


- My BIOS (P1.50) doesn't seem to have any option to account for Vdroop/Vdrop.

- What would you advice me to do if I want to get a higher OC? According to those voltage readings I am allready at maximum (Vcore 1.55)? Strange thing I still don't get with my OC / chip is that I could run it @ 3,4 with VCore 1.3750 (BIOS). I couldn't get my OC @ 3,6 stable with lower than 1.46250 VCore (BIOS); that's a pretty big gap for only 200mHz increase > maybe my chip isn't that good (RB-C2 revision)?



Any advice or help will be much appreciated. The load temperatures (under Prime95 BLEND 20+ hours) are still lower than 50C, so this makes me want to get a higher OC.

Thanks in advance.
PROTEUS
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X3 720BE @ 3,6 ASRock A780GXH/128M HD 4870 Corsair Dominator TWIN2X4096-8500C5D 
Hard DriveOptical DriveOSMonitor
Samsung EcoGreen F2 HD103SI, 1TB LG GGC-H20L WIN XP SP3 x32 Samsung Syncmaster T240HD 
PowerCaseMouse
Corsair HX750 Cooler Master Sileo 500 Logitech G9 
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PROTEUS
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CPUMotherboardGraphicsRAM
Phenom II X3 720BE @ 3,6 ASRock A780GXH/128M HD 4870 Corsair Dominator TWIN2X4096-8500C5D 
Hard DriveOptical DriveOSMonitor
Samsung EcoGreen F2 HD103SI, 1TB LG GGC-H20L WIN XP SP3 x32 Samsung Syncmaster T240HD 
PowerCaseMouse
Corsair HX750 Cooler Master Sileo 500 Logitech G9 
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post #2 of 16
Two questions, what specs including brand is your PSU and did you set Core Unleashing in your system BIOS or is it supported by your board?
post #3 of 16
Thread Starter 
The PSU is as stated in my previous post, it's a Cooler Master eXtreme Power Plus 500W.

Specifications


Formfactor Intel Form Factor ATX 12V V2.3
Maximum Power 500W
Efficiency >70%
Warranty 2 years
Diameter 150 x 86 x 140 mm
Fan Size 120 mm
Input Voltage 230V
Input Current 6 A
Input Frequency 60 / 50 Hz
PFC Passive PFC
Power Good Signal 100 ~ 500 ms
Hold Up Time > 17 ms
MTBF >100.000
Protection OVP / OCP / OPP / SCP
Safety Nemko / TUV / cUL / CE / BSMI /FCC / C-tick / CCC
*Check out the FAQ for expaliniation of the specifications

Label


As far as Core Unleashing: is this the same as ACC ? I have that disabled. Tried ACC when trying to unlock the 4th core, but it would always result in no POST


Edited by i4play - 6/9/10 at 10:46am
PROTEUS
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X3 720BE @ 3,6 ASRock A780GXH/128M HD 4870 Corsair Dominator TWIN2X4096-8500C5D 
Hard DriveOptical DriveOSMonitor
Samsung EcoGreen F2 HD103SI, 1TB LG GGC-H20L WIN XP SP3 x32 Samsung Syncmaster T240HD 
PowerCaseMouse
Corsair HX750 Cooler Master Sileo 500 Logitech G9 
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CPUMotherboardGraphicsRAM
Phenom II X3 720BE @ 3,6 ASRock A780GXH/128M HD 4870 Corsair Dominator TWIN2X4096-8500C5D 
Hard DriveOptical DriveOSMonitor
Samsung EcoGreen F2 HD103SI, 1TB LG GGC-H20L WIN XP SP3 x32 Samsung Syncmaster T240HD 
PowerCaseMouse
Corsair HX750 Cooler Master Sileo 500 Logitech G9 
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post #4 of 16
No it is not the same. ACC stands for Automatic Core Calibration and is used by your system to automatically calibrate voltages and synchronize FSB speeds during overclocking. This helps to stabilize the chip in many ways so that you dont underclock one core while overclocking other cores. Core unleashing is a method of removing the leashes or throttle limits on a processor set by the manufacturer to achieve a wider range of possible core clocks. This is useful and helpful in overclocking, but has the downside in that it will commit vcore voltage to the processor to increase performance. You said your board max is 1.55 vcore, then you may need to look at a different board. The best boards for overclocking are ASUS and Gigabyte. Both are excellent boards and have set some of the highest achieved overclocks on the planet today.
post #5 of 16
Do you have the latest BIOS updates for your board?
post #6 of 16
Thread Starter 
Quote:
Originally Posted by BodyShield View Post
No it is not the same. ACC stands for Automatic Core Calibration and is used by your system to automatically calibrate voltages and synchronize FSB speeds during overclocking. This helps to stabilize the chip in many ways so that you dont underclock one core while overclocking other cores. Core unleashing is a method of removing the leashes or throttle limits on a processor set by the manufacturer to achieve a wider range of possible core clocks. This is useful and helpful in overclocking, but has the downside in that it will commit vcore voltage to the processor to increase performance. You said your board max is 1.55 vcore, then you may need to look at a different board. The best boards for overclocking are ASUS and Gigabyte. Both are excellent boards and have set some of the highest achieved overclocks on the planet today.
When saying 1.55V I wasn't refering to my board max. I was refering to maximum voltage is being adviced (on these boards) for PhenomII processors. I can set higher voltages on my board though.

There seems to be no Core Unleash option in my BIOS

Quote:
Originally Posted by BodyShield View Post
Do you have the latest BIOS updates for your board?
Yes, P1.50 is the latest BIOS for my board
Edited by i4play - 6/9/10 at 11:05am
PROTEUS
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X3 720BE @ 3,6 ASRock A780GXH/128M HD 4870 Corsair Dominator TWIN2X4096-8500C5D 
Hard DriveOptical DriveOSMonitor
Samsung EcoGreen F2 HD103SI, 1TB LG GGC-H20L WIN XP SP3 x32 Samsung Syncmaster T240HD 
PowerCaseMouse
Corsair HX750 Cooler Master Sileo 500 Logitech G9 
  hide details  
Reply
PROTEUS
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X3 720BE @ 3,6 ASRock A780GXH/128M HD 4870 Corsair Dominator TWIN2X4096-8500C5D 
Hard DriveOptical DriveOSMonitor
Samsung EcoGreen F2 HD103SI, 1TB LG GGC-H20L WIN XP SP3 x32 Samsung Syncmaster T240HD 
PowerCaseMouse
Corsair HX750 Cooler Master Sileo 500 Logitech G9 
  hide details  
Reply
post #7 of 16
Okay, thanks. You will be fine as long as you have good enough cooling for your processor. I have pushed Phenom processors up to 1.9V and they held up okay. Can achieve some serious overclocks on a Phenom 1090T at 5.8 GHz per core effective stable at about 1.86V.
post #8 of 16
Thread Starter 
O.K., that is something but isn't it quite a big gap
BIOS VCore: 1.4625
CPUID VCore: ~ 1.53 (average under load)

That's almost a .07 difference / Vrise (if such a thing actually exists )
PROTEUS
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X3 720BE @ 3,6 ASRock A780GXH/128M HD 4870 Corsair Dominator TWIN2X4096-8500C5D 
Hard DriveOptical DriveOSMonitor
Samsung EcoGreen F2 HD103SI, 1TB LG GGC-H20L WIN XP SP3 x32 Samsung Syncmaster T240HD 
PowerCaseMouse
Corsair HX750 Cooler Master Sileo 500 Logitech G9 
  hide details  
Reply
PROTEUS
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X3 720BE @ 3,6 ASRock A780GXH/128M HD 4870 Corsair Dominator TWIN2X4096-8500C5D 
Hard DriveOptical DriveOSMonitor
Samsung EcoGreen F2 HD103SI, 1TB LG GGC-H20L WIN XP SP3 x32 Samsung Syncmaster T240HD 
PowerCaseMouse
Corsair HX750 Cooler Master Sileo 500 Logitech G9 
  hide details  
Reply
post #9 of 16
Dont be worried about the indescrepancy here. The vcore is managed not only by the BIOS, but also by the processor. If a CPU needs more juice to support the overclock you are running, it will use it. This is normal. It should limit a little closer to what you set in BIOS, but you will be fine.
post #10 of 16
If you are worried try turning off the Active Core Control and set everything on your own. This will keep your board from committing too much extra voltage to your CPU to stabilize the overclock.
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