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Loadline Calibration, leave on Auto? - Page 4

post #31 of 35
Quote:
Originally Posted by Kirby1;13267609 
Use HWMonitor32 (will work on 64-bit)

http://www.downloadtyphoon.com/hwmonitor-32-bit-/infojxmbdugk
Oh, you mean this then:

http://www.cpuid.com/softwares/hwmonitor.html

smile.gif

Anyway, doesn't this display the exact same voltages in the exact same way as CPU-Z with one less decimal? I mean after all, both HWMonitor and CPU-Z are a product of CPUID.
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #32 of 35
Use LLC to compensate for vdroop. Simples

Without llc example

1.45v bios no llc = 1.38 load

With llc example

1.45 bios with llc high = 1.43 load

You need to play with the right llc setting to get the best effect as you do not want it to throw too much voltage into the cpu under load, But enough to compensate for vdroop

CPU-Z works well for me
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Chewy's Chomper
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post #33 of 35
Load Line Calibration

Came here looking for an explanation for the ASROCK P67 Extreme4 load line calibration settings do.

Realized I might be of some help explaining what LLC does.


Quick Background
The onboard voltage regulator step down the input voltage to the core voltage (usually via a multi-phase buck regulator).

The controllers are very good at regulating the output voltage at physical the output of the regulator (or wherever they choose to sense the voltage at).
Side note: In certain industry its standard to remote sense the voltage at the load, but I've never seen that on a computer motherboard. I'm guessing the added impedance in the feedback loop cuts down on phase margin and therefore the bandwidth, but I'm not sure. It could be that they want to be very careful to not overvoltage the CPU.

Between the output of the regulator and the chip there are copper traces. These traces have a non-zero resistance.

From ohms law V=IR (voltage = Current * Resistance).

Resistance of the traces is fixed, therefore as you increase the current to the processor, you will increase the voltage drop between the output of the voltage regulator and the chip core.

This is not a "good" thing. Intel does not "add it in", it's basic physics. If it was economical to use super conductors in motherboard power circuits we would.



What load line calibration does.

If you "know" the current being delivered by the voltage regulator (which the control loop does), and know the resistance between the voltage regulator and the cpu (which is trivial for the designers to calculate or measure), then you "know" what the voltage drop will be.

Load line calibration *should* increases the output voltage to account for the drop across the copper traces and provide a constant voltage at the chip core.



Now on to my question. Does anyone know exactly what the different settings on the Asrock P67 Extreme4 are doing? There is no explanation in the manual. I was going to go home after work and experiment, but if anyone else knows that would be great.

-dan
post #34 of 35
Had the same problem with CPU-Z on 1.57 and was told it works with 1.57.1 which it does.

http://www.softpedia.com/get/System/System-Info/CPU-Z.shtml

Grab that and install. Check to make sure its version 1.57.1 in About, but seems to read the same as HWMonitor.

The rig in my sig is broken down for RMAs at the moment, but should work fine.
post #35 of 35
Asrock P67 Extreme 4 load line Calibration - More info


The load line calibration settings appear to be guesses for the resistance to the CPU core.

The lower numbers are guess "higher resistance" and therefore produce a higher output voltage for a given load current.

On my motherboard. Load line 2 resulted in a slightly negative slope of CPU_Core_Voltage vs Power. (About -.05 volts no/full load)

Load line 1 resulted in a slightly positive slope of CPU_Core_Voltage Vs Power (about +.05 volts no/full load)


2500K 4.7 GHz 1.38 Volts (CPUz reading)

-dan
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