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Lower VID is better?

post #1 of 11
Thread Starter 
CPUs with lower VID are better oevrclockers?
I mean, there must be a meaning behind the lower VID for a same revision CPU.

My E2140 M0 > 1.325V
My E2160 M0 > 1.265V

wat
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wat
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post #2 of 11
All it means is that your computer requires less voltage at stock speeds to operate normally. It theoretically has a bearing on how the voltage will scale as you increase the clock speed, but it doesn't always hold true.
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R'lyeh
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post #3 of 11
Lower VID usually needs less volts to overclock to the same level. say you have a chip with a VID of 1.325, then it will take 1.325 Volts to get it to run at stock, where the other chip will only take 1.265. Heat output will be less with less volts, and it typically takes less volt to OC.
post #4 of 11
Thread Starter 
hmm...
But it has 5ºC difference between the cores...
That's weird...
o.O

My E2140 has the two cores at the same temps always...
wat
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wat
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post #5 of 11
The temp difference between the cores could be various reasons but not the VID in tis case. One reason could be the thermal grease spreads uneven.
post #6 of 11
Quote:
Originally Posted by afzsom View Post
All it means is that your computer requires less voltage at stock speeds to operate normally. It theoretically has a bearing on how the voltage will scale as you increase the clock speed, but it doesn't always hold true.
yes, vid is actually a table in the cpu set up by a bit map (usually 5-bits) that control the pins by sending pre-set voltages. that's why you can only increase/decrease in set increments. so vid is the voltage control mechanism which works together with a voltage regulator on the mainboard and the cpu.
    
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post #7 of 11
Quote:
Originally Posted by afzsom View Post
All it means is that your computer requires less voltage at stock speeds to operate normally. It theoretically has a bearing on how the voltage will scale as you increase the clock speed, but it doesn't always hold true.
Exactly.

The VID (or "Voltage IDentification") is the "stamp" put on the CPU by the manufacturer - telling the motherboard (or you) what voltage is required to run at stock frequency.

When some "batches" of CPU's are tested after production, they run stable at the stock frequency with more or less volts. This can depend on a lot of factors including quality of manufacturing, and merely luck.

Generally, one would think that a CPU capable of the stock frequency at lower volts will overclock with lower relative volts as well. While this seems to be a trend in certain cases, it isn't always true. It varies with each individual CPU.
    
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post #8 of 11
not exactly. vid can be changed based on values set up by the vid bit-map. each processor is different. check out the data sheets on the intel or amd site.
    
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post #9 of 11
Quote:
Originally Posted by ldk View Post
not exactly. vid can changed based on values set up by the vid bit-map. each processor is different. check out the data sheets on the intel or amd site.
I actually agreed with your earlier post. I think we are both right.

But as far as I know, the VID itself cannot generally be changed. At least not by a typical user. I understand what makes up the VID starts as a bit-map of possible options - but once set by the manufacturer, for all intensive purposes, it's locked at that specific number (voltage).
    
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post #10 of 11
Quote:
Originally Posted by Choggs396 View Post
I actually agreed with your earlier post. I think we are both right.

But as far as I know, the VID itself cannot generally be changed. At least not by a typical user. I understand what makes up the VID starts as a bit-map of possible options - but once set by the manufacturer, for all intensive purposes, it's locked at that specific number (voltage).
right, vid is regulated by the mainboard and cpu. vid is a table of values set at the factory and does not change. the cpu can change the vid based on input from the mainbord regulator as long as they are valid in the table. if you check out the intel site data sheets they have some fairly decent discussions on how vid is set up and processes affecting it.
    
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