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What causes a processor to require exponentially more voltage beyond a certain freq? - Page 3

post #21 of 37
Quote:
Originally Posted by CookieSayWhat View Post
Wind resistance.
yup, got it right. at higher speeds, aero is much more important than hp.
post #22 of 37

probably not this, but its damn hard to replicate...

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post #23 of 37
And for some reason, the audio is behind a little behind the video.
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post #24 of 37
Quote:
Originally Posted by roflolol View Post
hmmm... can you clarify capacitance for me?
Capacitance is the ability for a material to store charge.

I'm a pretty poor physicist but I don't think the fact that power rises exponentially with voltage explains it. I think a better explanation would be that higher voltages results in greater heat (because there is no perfect conductor), which in turn increases the resistance (V=I*R). That means more current needs to be supplied to the circuit which in turn creates more heat and because of the exponent it quickly increases. Some quick reading of wikipedia suggests that heat and resistance are not linear in semiconductors.
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post #25 of 37
thsi explaination does't explain why there needs to be more voltage past 4ghz but explains it is an graphical sense why we raise voltage to deal with increase in frequency.

Bear with me as paint is a ****ty program.

So in this graph you have a 1 line and 0 line this is for the open and closing of transistor gates, and can be thought of as 1 or 0 for computer software bits. The wave will be the processors frequency, so at normal operation the wave aims for the VID which is above the 1 line, so that it hits the one line when needed for the program or software. It then processeds to hit 0 line when needed as well. Now when you overclock you increase the frequency thus automatically decreasing the wavelength so that in the same period of time you are able to hit 1 and 0 quicker. Now when you increase the frequency the amplitude(the highet between the top of the wave and the midpoint) slightly decreases. Amplitude is really energy required to make the wave hit the 1 line while aiming fo the VID line. So you see int eh middle section that the wave is barley hitting the 1 line. So we increase over the VID and by doing this we slightly increase the amplitude so that the curve hits the 1 line again.

The 1 line never changes, and so the only thing we can change is the VID line. You can also put in the relationship between current and voltage and think of it as you increase the voltage and power needed you also need to increase current which is a huge part of the energy needed.

Duckie got it right ont eh money the relationship isn't linear its exponential.

Edited by Sin0822 - 2/2/11 at 8:41am
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post #26 of 37
My pII x3 740BE -> x4 40 didn't work at 17.5x210 @1.40????? so I put it to 1.409???? and ran prime 95 for 11h10m, until I shut it down.
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post #27 of 37
Quote:
Originally Posted by Spicy61 View Post
yup, got it right. at higher speeds, aero is much more important than hp.
In a sense of creating down force so the car can still handle, but for top speed its kind of a game trading off down force for increased top speed.
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post #28 of 37
Quote:
Originally Posted by CookieSayWhat View Post
Probably the same reason it takes 200 horse power to do 100 MPH and 1000 horse power to do 255 MPH.

Though that's just a guess.
Quote:
Originally Posted by CookieSayWhat View Post
Wind resistance.
it doesn't take anywhere near 200hp to do 100mph lol
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post #29 of 37
Quote:
Originally Posted by clark_b View Post
it doesn't take anywhere near 200hp to do 100mph lol
It was to prove a point.

But I'd say it has more to do with wind resistance than anything.

My van makes like 220HP and it sure has one hell of a time getting to 100. Highest I've been able to get it is to 104.
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post #30 of 37
My best guess is that as Vcore goes up heat goes up. As heat increases you get more electron leakage therefore even more heat and you need higher voltage to compensate for the leak.

Bottom line: As long as you can keep your cpu cool you can increase speed.
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