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Abit uGuru reported vCore fluctuations

post #1 of 3
Thread Starter 
Hi guys,

I've got my sig rig running at 3.906GHz (434*9) with a BIOS set vCore of 1.335. Peak reported temp (realTemp) is 50C, idle is 35-36C.

1.325 gave me an Orthos rounding error. . .during this run I was watching the uGuru Abit EQ hardware monitoring voltage window and saw a spike to 1.34 volts vCore for an instant, as well as a maximal drop down to 1.29 volts.

On my run at 1.335 the highest I've seen so far is 1.33 when idling, and it's averaging 1.3 under load.

What I'm wondering about is how accurate the hardware monitoring is when it comes to those momentary reporting points that are higher than the BIOS set voltages. I would normally figure that an average vCore is the one that I care about with respect to stability, and that average is 1.30 under load. . .but seeing it spike above my BIOS setting worried me a little bit, especially as I get to higher and higher vCore settings, and given the sensitivty of these 45nm CPUS to excessive vCore.


My PSU is stable and seems to deliver nicely regulated power based on OCCT data - but that momentary spike to 1.34 caught my eye. Initially I didn't really want to go above 1.325 - but it seems that 1.335 is what my system is going to take for a stable 3.9 GHz.

Oh and on this system it took a BIOS set vCore of 1.315 for stable 3.797GHz (422*9)
Edited by 8KCABrett - 12/20/08 at 6:44pm
post #2 of 3
It's supposed to do that.

Vdroop
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
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post #3 of 3
Thread Starter 
Thanks for the link - that has some great info in it! I suppose my question was a bit lost in my rambling up there (was a long day) - it's not the droop per se that was a surprise, but rather the increase above my BIOS setting. Your link does shed some light on that as well though - so thanks again!

I guess it's time for 4.0!




So once again, I see higher than the the BIOS set value of 1.345 vCore initially, and under load it dropped to 1.29v and errored out.

Unfortunately that seems to suggest that setting a value of say 1.35vCore will lead to spikes above 1.365volts.
Edited by 8KCABrett - 12/21/08 at 5:23pm
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