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"tricks" for minimum voltage 1055T - Page 4

post #31 of 46
Quote:
Originally Posted by IOSEFINI;13504058 
Somebody who understands how things work
i was talking about killing the VRMs, if undervolt, not the CPU. The CPU "pulls" the amperage from VRMs

VRM´s are just converting 12V , to 0.8-1.x V

If cpu wattage goes down, "vrm wattage" must go down also.

VRM´s are working in switching mode - just like PSU,
don´t be confused about analog style voltage regulation.
(these are terible inefficient. LM317, LM7805 ...etc)

You would be right, if VRM was using analog regulation. cheers.gif
    
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post #32 of 46
Quote:
Originally Posted by Atomfix;13504249 
RIGHT! I will now do a test, my watt meter has a amperage meter aswell.

Testing time cheers.gif

You have to put the amps meter between the CPU and VRMs
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post #33 of 46
Prime95 Testing + Watt meter with Amperage meter

Settings:
CPU @ 3600MHz @ 1.43V LLC 100% 1.45 Amps
CPU @ 3600MHz @ 1.32V LLC 100% 1.29 Amps

Conclusion.....
Lower voltage = Lower amps thumb.gif
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post #34 of 46
Quote:
Originally Posted by pietro sk;13504278 
VRM´s are just converting 12V , to 0.8-1.x V

If cpu wattage goes down, "vrm wattage" must go down also.

VRM´s are working in switching mode - just like PSU,
don´t be confused about analog style voltage regulation.
(these are terible inefficient. LM317, LM7805 ...etc)

You would be right, if VRM was using analog regulation. cheers.gif

CPU wattage will not go down, only if you underclock it. OP wants to keep a certain clock
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post #35 of 46
Quote:
Originally Posted by Atomfix;13504293 
Conclusion.....
Lower voltage = Lower amps thumb.gif

Huh, can you try even lower voltage? +rep if you prove us wrong.
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post #36 of 46
V = I.R
I = V/R

If resistance stays constant (which it should, if the CPU and components do not change) then current should drop with voltage. Unless my maths is wrong.
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post #37 of 46
Quote:
Originally Posted by Devilmaypoop;13504310 
Huh, can you try even lower voltage? +rep if you prove us wrong.

Settings:
CPU @ 3600MHz @ 1.43V LLC 100% 1.45 Amps
CPU @ 3600MHz @ 1.32V LLC 100% 1.29 Amps
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post #38 of 46
Remember there is alway a + or - tolerate to all components and this is why no cpu/mobo/video card/memory/hdd/rom are created equal. So a 125 TDP cpu can run on 120 TDP.
Edit
The TDP is the average TDP on the cpu. Lets say that the cpu had a +/- 5% watts tolerate and cpu is a 100w TDP cpu. So the cpu can run between 95w-105w for is TDP at stock speed.
Edited by dixson01974 - 5/14/11 at 2:21pm
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post #39 of 46
Quote:
Originally Posted by dixson01974;13504128 
Nope. The transister will not stop work. It will stop producing the voltage you need. Transister alway uses X amount of voltage and amps, but can stop producing the voltage if you down below a certain point. Most mobo are design to go down as low as .5v. So the mobo is design to run as low as .5v on the cpu before the transister stops producing the voltage you will need to run the cpu.
EDIT
Think of it this way. The VMR are like a transfers. Design to producing X amount - x amount of voltage.
transistors in cpus working in full-open or full-closed mode.

if extreme undervolted (going closer or below to the Voltage treshold of transistors), transistors can´t be controlled reliably anymore.
Depending how some particular transistor is made (depletion/enhacement mode) these will stay open or closed. => trans. will not respond to incoming on/off signal

4.48.png
cmos inverter. it´s one of a basic building blocks in digital chips. (another examples : buffer, J-K ,AND, OR, etc..)
---
memory is built from is sram cells img658.png


Undervolted cpu can easier make errors, due to some transistor more voltage sensitive than others.

No worry, Cpus have error protection mechanisms,
for example ECC (or parity)protected caches, buses...
cheers.gif
Edited by pietro sk - 5/14/11 at 2:33pm
    
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post #40 of 46
Quote:
Originally Posted by pietro sk;13504545 
transistors in cpus working in full-open or full-closed mode.

if extreme undervolted (going closer or below to the Voltage treshold of transistors), transistors can´t be controlled reliably anymore.
Depending how some particular transistor is made (depletion/enhacement mode) these will stay open or closed. => trans. will not respond to incoming on/off signal

4.48.png
cmos inverter. it´s one of a basic building blocks in digital chips. (another examples : buffer, J-K ,AND, OR, etc..)
---
memory is built from is sram cells img658.png


Undervolted cpu can easier make errors, due to some transistor more voltage sensitive than others.
No worry, Cpus have error protection mechanisms, for example ECC (or parity)protected caches, buses...
cheers.gif

Right there, But Some of us don't use ECC RAM lol
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