As I understand it (correct me if I'm wrong), with loadline disabled, suppose I choose 1.25v bios as cpu vcore. That will actually set vcore at 1.23 volts idle (Voffset). During load with dual core that may decrease to 1.22 (Vdroop), but immediately after load stops, before the vrm circuit can decrease the voltage in time for new decreased workload there is overshoot to 1.25v as a spike before decreasing back to 1.23 idle. Thus when you are choosing 1.25 volts in bios, you are choosing max volts ie, overshoot max, and not idle volts.
My guess how loadline works, again, correct me if I am wrong. When loadline is enabled, and you choose 1.25 volts in bios, you are then choosing the idle volts and thus it idles at 1.25V. During load you still see vdroop to 1.24v, and overshoots to 1.27v.
In other words having loadline disabled and a vcore of 1.25v bios (which sets idle at 1.23v measured) is the exact same thing as having loadline enabled and setting vcore to 1.23v bios (idle at 1.23v measured).
Is that correct? Or does it work in some other way. If so, I actually like loadline as it simply gives me the option of using bios to set volts at either max spike or more what I prefer, idle volts.
Either way, can you explain anandtech's statement... "As we have discussed before Loadline Calibration is best left disabled, especially when using the newer 45nm CPUs. Our testing has shown these settings induce power instabilities, even when using lower voltages. In addition, when enabled the option sometimes requires more CPU voltage than would otherwise be necessary, meaning increased power dissipation and higher temperatures."
http://anandtech.com/mb/showdoc.aspx?i=3208&p=2
Bottom line if loadline on the gigabyte board is just a simple 4 notch .02v sensor calibration, then I can ignore anandtechs statement, but if loadline calibration is doing something else, than the "power instabilities" might lead me to stay away from it.
thanks in advance for any replies...
My guess how loadline works, again, correct me if I am wrong. When loadline is enabled, and you choose 1.25 volts in bios, you are then choosing the idle volts and thus it idles at 1.25V. During load you still see vdroop to 1.24v, and overshoots to 1.27v.
In other words having loadline disabled and a vcore of 1.25v bios (which sets idle at 1.23v measured) is the exact same thing as having loadline enabled and setting vcore to 1.23v bios (idle at 1.23v measured).
Is that correct? Or does it work in some other way. If so, I actually like loadline as it simply gives me the option of using bios to set volts at either max spike or more what I prefer, idle volts.
Either way, can you explain anandtech's statement... "As we have discussed before Loadline Calibration is best left disabled, especially when using the newer 45nm CPUs. Our testing has shown these settings induce power instabilities, even when using lower voltages. In addition, when enabled the option sometimes requires more CPU voltage than would otherwise be necessary, meaning increased power dissipation and higher temperatures."
http://anandtech.com/mb/showdoc.aspx?i=3208&p=2
Bottom line if loadline on the gigabyte board is just a simple 4 notch .02v sensor calibration, then I can ignore anandtechs statement, but if loadline calibration is doing something else, than the "power instabilities" might lead me to stay away from it.
thanks in advance for any replies...
Comment