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What is the overclocking?


Risks of the overclocking

How does a mike work

Possibilities for the overclocking

Some recommendations

How much can overclockearse a mike?

The refrigeration

Refrigeration for software

A small practical example

Conclusion

Updated page
6/18/2001


Author:
Juan Herrerías Rey
 

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The overclocking of the microprocessor



His publicity in CsH

 

How much can overclockearse a mike?

It depends on the mike. No, it is not an only one way of "escaquearme" of answering, it is a reality: every mike is a world, and it is different from all the rest. Even two mikes of the same model, of the same factory and even of the same series they can have different tolerance to the overclocking, and there is no way of knowing it beforehand.

Nevertheless, yes a few indications can happen:

Type of mike

Description of the original mike

Notes - Advices

Classic Pentium
(not MMX)

50/60/66 bus MHz

Free multiplier

They allow a lot of possibilities, changing the bus and/or the multiplier; few badges of this epoch will admit the 75 MHz speed

Pentium MMX

66 MHz bus

Free multiplier

They allow a lot of possibilities, changing the bus and/or the multiplier, although this one was limited in some series

AMD K5

50/60/66 bus MHz

Fixed multiplier

Limited to changing the speed of the bus

AMD K6

66 MHz bus

Free multiplier

They allow a lot of possibilities, changing the bus and/or the multiplier; two models of K6 exist to 233 MHz, one of them works to 3,2 V, therefore it warms up too much

AMD K6-2

66/95/100 bus MHz

Free multiplier

They allow a lot of possibilities, changing the bus and/or the multiplier; the scarce models of more than 300 MHz who use 66 MHz bus are very little advisable

AMD K6-III

66/100 bus MHz

Free multiplier

They warm up too much, slightly tolerant with the overclocking; in any case, to combine bus and multiplier so that the bus speed is the biggest possible one

Cyrix 6x86/M2

50/55/60/66/75 bus MHz

Limited multiplier

Although they not all allow to change the multiplier, the possibilities are enough, but some series have an excessive voltage; in general, perhaps be slightly delicate

Pentium II up to 333 MHz

66 MHz bus

Multiplier:?

Very good or very bad for the overclocking, depending on the possibilities of the multiplier (I fix from 300 MHz that) and of the characteristics of the badge

Pentium 350 MHz II or more, the first Pentium III

100 MHz bus

Fixed multiplier

Everything will depend on the characteristics of the badge (someone offer buses of 105, 110... and up to 133 MHz, others only of 100 MHz)

Pentium modern III

(nucleus "Coppermine")

Bus of 100 ó 133 MHz

Fixed multiplier

Everything will depend on the characteristics of the badge; in any case, they allow overclockings raised thanks to his limited voltage

Celeron without cache memory

66 MHz bus

Free multiplier

Of the best thing for overclocking, but the absence of cache memory slows down him in many tasks (although in games it is fine)

Celeron with cache memory (models "To", nuclei Mendocino and Coppermine-128)

Bus of 66 ó 100 MHz

Fixed multiplier

Of the best thing for overclocking, despite the fixed multiplier. Of the modern ones, the most advisable there are the models for 100 MHz bus (those 800 MHz and Superiors)

Pentium 4

400 MHz bus (really 100x4)

Fixed multiplier

Everything will depend on the characteristics of the badge; in any case, they tend to warm up enough

AMD K7 Athlon
in format Slot A

200 MHz bus (really 100x2)

Multiplier liberable

Fantastic overclocking capacity, but to make use of it to the maximum his multiplier must be liberated opening his casing and welding, or by means of small circuit badges ("gold fingers"). They must be refreshed well

AMD K7 Athlon
in format Socket A

Bus of 200 ó 266 MHz (100x2 ó 133x2)

Multiplier liberable

Fantastic overclocking capacity, but to make use of it to the maximum his multiplier must be liberated joining the bridges L1 (to see here). They must be refreshed well

AMD Duron

200 MHz bus (really 100x2)

Multiplier liberable

Fantastic overclocking capacity, but to make use of it to the maximum his multiplier must be liberated joining the bridges L1 (to see here). They warm up less than the Athlon

To what it is possible to add that if for what he looks is to buy a new computer to do overclocking (although no guarantee will cover the possible damages), I bought the most rapid memory and of better mark that could find; if it is PC133, it will be better if it is capable of reaching CAS 2. At the time of doing overclocking or of be updating, he will be grateful for it.

 

The refrigeration

As we were saying that it already does a few pages, the overclocking, successfully or not, it ALWAYS produces heat. This heat is one of the principal enemies of any electronic device, therefore we owe to deal with eliminating it of our system. Very few mikes are capable of supporting 70ºC in a continuous way without becoming terribly unstable or starting "to be burned".

First we must refresh the component in question, in general the mike, although the graphic card also can warm enough. For it, a heat spendthrift exists on the mike, which absorbs the heat for his surface and expels it, helped by a fan to prevent from stagnating this warm air close to the mike.

Since it is logical, the major are the spendthrift and the fan, the better. There exist fans that allow to control his speed of rotation or the temperature of the spendthrift with whom they are in contact, what is something very important. It is not strange at all that a standard fan, which they are usually of a quite mediocre quality, remains clogged without warning and fries the mike (one of the motives for which it is not necessary to make a computer alone overclockeado up to knowing if it works well to 100 %).

Fan and spendthrift with cell Peltier (the white square)

Other devices that they can help very much in an overclocking are the cells Peltier. These curious devices are a few plates that, on having been crossed by the electric current, do that one of his faces cools down enough, while other one warms up (also enough, for what in this face there must keep on placing a spendthrift and a fan). These devices are very effective, but the bad thing is that they are expensive, they consume a lot of electrical potency and are difficult to find in Spain.

Apart from the shops of electronics, where fans and quality spendthrifts can be (cells Peltier in less cases), one of the best places to look for these devices is Internet. It is enough to happen for Yahoo or Altavista and to mess "cpu to cosmell" to find a series of web sites where they sell all kinds of material at good price. Two examples of these places are www.3dfxcool.com or www.computernerd.com

Also accessories as silicone sell termoconductora so that the mike and the spendthrift do a good contact, fans for graphic cards, fans for hard disk... And in some cases, up to "kits" for refrigeration for liquid, with radiator, compressor and the whole necessary paraphernalia.

Any way be which be the method to refresh the fan, it will not serve as anything if we do not expel the heat on the outside from the casing of the computer. Bear in mind that the spendthrift and the fan do not do that the heat disappears, only they move it of place, but so harmful it is close to the mike as accumulating inside the casing without being able to go out...

So that the refrigeration is perfect, the ideal thing is to have a fan that introduces cold air in the casing (although the air of Madrid in summer is distant from being very much a cold, perhaps I needed to install air conditioning) and other who expels it. In a normal team, the power supply usually extracts the warm air, but there is no usually an entry fan. So it will not be any foolery to buy a fan and to install it in the frontal part of our computer, where generally already there are a few augers prepared for a fan of 8x8 cm.

In any case, bear in mind two points: one, which the warm air raises, so the air exit must be above (NEVER PLACED under the entry of cold air); and two, that there exist few so effective and cheap ventilation schemes like opening the casing of the computer. It is not very nice (good, there are tastes for everything), but it works very well.

 


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