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vdrop and vdroop

post #1 of 8
9/10/08 at 2:59pm
Thread Starter 
What is vdrop and vdroop how do i know if i have it?
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post #2 of 8
9/10/08 at 3:02pm
Compare the voltage for the cpu that you have set in your bios, to the voltage that Cpu-Z reads out. That is your answer
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post #3 of 8
9/10/08 at 3:06pm
Thread Starter 
How do i fix it if cpu-z reads it wrong?
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post #4 of 8
9/10/08 at 3:06pm
Vdroop is when your CPU voltage goes lower than the set value due to stress and passing through MOSFETS. Another example if that is: say you are listening to music in your car. You have a really nice system with aftermarket head unit, subwoofer, and two amps to cover all 5 (or however many you have) speakers. With the volume turned up (inducing stress), your lights blink to the music because you haven't enough amperage to supply to everything. See that due to stress on the electrical system, your 13.8v-14.4v current is being momentarily dipped down to say 11.6v.

Virtually all PCs are succeptible to vdroop. A good way to really check it out is note your BIOS voltage settings. Boot the computer up and open up CPU-Z and look at the voltage value. Because no system is perfect, I can guarantee that you will have at least some vdroop present.

There are ways to combat the symptoms, such as overvolting, or another just as popular remedy, the pencil mod. Basically you are lowering resistance in a given adjacent MOSFET, or the like, to compensate for the loss in voltage at load.
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post #5 of 8
9/10/08 at 3:46pm
Oh, there's confusion here......................

Vdrop:
Your PSU can not supply the power the system is calling for and the voltage drops.
Check this by connecting a digital volt meter to a spare 12v molev. Stress the computer and see how low the voltage falls. more than 5% is a potential problem.

Vdroop (the Cliff's version!):
When the CPU's load changes, the motherboard sends more voltage to the CPU. Since the motherboard's voltage regulator can't accurately change voltages at the extreme rates called for by the motherboard, some overshoot of the target voltage occurs. Vdroop just sets a lower target voltage so that the CPU isn't overvolted by the voltage overshoots by the motherboatd voltage regulator.

So are either Vdrop or Vdroop bad?
Vdrop: So long as it is less than 5%, is pretty much OK for everything except extreme benchmarking (wherein even a 0.05v change may kill an overclock!)

Vdroop: Great for everyday use up to pretty hard overclocks. It protects the CPU.
Fro extreme overclocks (i.e. LN2) many people like to controll voltages absolutely. Many of these rigs have altered/modified voltage regulators anyway.

Hope this helps..............
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post #6 of 8
9/11/08 at 1:00pm
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i hope i dont need another psu
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post #7 of 8
9/11/08 at 2:06pm
open cpuz and watch the voltage when your computer is on load or idle
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post #8 of 8
9/12/08 at 5:58am
Quote:
Originally Posted by razr7 View Post
open cpuz and watch the voltage when your computer is on load or idle
Better to hook a digital volt meter to a spare 12v molex and watch the 12v rail change with load. That will tell you if you need a better (but, not necessarily bigger!) PSU.
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