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Overclocked CPU's, estimated life??? say E6400 at 3ghz?

Jaffar21

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ok so wats a Overclocked CPU's, estimated life??? say E6400 at 3ghz?

or if u want to take extream overclocking a E6400 at 3.8ghz (this is for

example)so pretty much overclocked to the max while still stable how long do u

think they'll last before they jst die(years,months,days?)?

so jst generally 2 questions kinda

1. ok so wats a Overclocked CPU's, estimated life for a modirate overclock say a

E6400 at 3ghz

2. and second a Overclocked CPU's, estimated life for a extreame overclock max

until unstable say somewhere between 3.4ghz-3.8ghz(depending on ur cpu)
 

WarEagleAU

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Id say its about 20-25% less than non oc'd. Provided it has decent cooling, it could last the life of a non oc'd one or longer
 
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I've never seen a CPU die because of overclocking, if it happens it won't happen without increasing the Vcore. (Northwoods for example are known to die when you give them over 1.7V) It's pretty safe.
 

newtekie1

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Years assuming proper cooling. By the time it dies from overclocking the processor will long be obsolete.
 

Khriez

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What if it was overvolted like crazy but using a phase changer ?

And what is considered decent cooling? Is a zalman 9500 decent? Then a zalman 9700 considered good?
 

BIOHazard87

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I have had many CPUs die without too much vcore, and decent cooling within 2 years
 

Solaris17

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no too much vcore no matter what cooling will kill it its stress on the physicall parts.
 
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I've never had a cpu die on me yet. The following cpu's have been used for F@H, so therefore run at full load for hundreds of hours at a time.

P4 640 (3.2ghz prescot) @ 4.9ghz 1.7v
PD 805 (2.66ghz Smithfield) @ 4ghz 1.7v (200w TDP :eek:)
C2D e6400 (2.13ghz Conroe) @ 3.6ghz 1.48v

All were used with pretty high-end water cooling. 1.7v is the max of the motherboard. The vDroop mod was done for the P4 and PD, because they used to pull an insane amount of power.

I've actually got through more motherboards than cpu's!
 
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I've never had a cpu die on me yet. The following cpu's have been used for F@H, so therefore run at full load for hundreds of hours at a time.

P4 640 (3.2ghz prescot) @ 4.9ghz 1.7v
PD 805 (2.66ghz Smithfield) @ 4ghz 1.7v (200w TDP :eek:)
C2D e6400 (2.13ghz Conroe) @ 3.6ghz 1.48v

good info on the 6400. i've been pondering this same question.

i run mine at 3.6ghz 24/7 with vcore of 1.46v or so and have done so for about three months with nary a hiccup; don't fold or anything. temps are always around 38C idle and 54C orthos load. although, i've noticed when doing my daily work (video rendering, etc. ... loads never exceed 44C or so).

hope to use this chip at least till next years tax time ...
 
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i did hear that the estimated designed life span of a cpu is 7 years...........so u go ahead and oc, can you imagine what cpu's will be like in 7 years time.
 

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When the CPU dies/heats up too much does that mean you'd have to replace the motherboard aswell ?

Well if it dies from overheating, it might or might not take the motherboard with it.
 

Khriez

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Well if it dies from overheating, it might or might not take the motherboard with it.

Okay, so ... lets say you had a good TEC/Watercooling system on the processor. It was 60% overclocked. It's been 3 years and the processor had died(let's pretend we are pyshic -- 100% sure that it was the processor will not let the MOBO boot), the temps never went over 60°C on full load over the 3 years.

Will you need to replace the motherboard?

In other words, overheating and a stressed out CPU from overclocking is different right ?
 

ex_reven

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What if it was overvolted like crazy but using a phase changer ?

And what is considered decent cooling? Is a zalman 9500 decent? Then a zalman 9700 considered good?

cooling is only one part of it
increased voltage causes increased electromigration

from wiki
Electromigration decreases the reliability of ICs. In the worst case it leads to the eventual loss of one or more connections and intermittent failure of the entire circuit. Since the reliability of interconnects is not only of great interest in the field of space travel and for military purposes but also with civilian applications like for example the anti-lock braking system of cars, high technological and economic values are attached to this effect.

Due to the relatively high life span of interconnects and the short product lifecycle of most consumer ICs, it is not practical to characterize a product's electromigration under real operating conditions. A mathematical equation, the Black's equation, is commonly used to predict the life span of interconnects in integrated circuits tested under "stress", that is external heating and increased current density, and the model's results can be extrapolated to the device's expected life span under real conditions. Such testing is known as High temperature over life (HTOL) testing.

Although electromigration damage ultimately results in failure of the affected IC, the first symptoms are intermittent glitches, and are quite challenging to diagnose. As some interconnects fail before others, the circuit exhibits seemingly random errors, which may be indistinguishable from other failure mechanisms (such as ESD damage.) In a laboratory setting, electromigration failure is readily imaged with an electron microscope, as interconnect erosion leaves telltale visual markers on the metal layers of the IC.

With increasing miniaturization the probability of failure due to electromigration increases in VLSI and ULSI circuits because both the power density and the current density increase. In advanced semiconductor manufacturing processes, copper has replaced aluminium as the interconnect material of choice. Despite its greater fragility in the fabrication process, copper is preferred for its superior conductivity. It is also intrinsically less susceptible to electromigration. However, electromigration continues to be an everpresent challenge to device fabrication, and therefore the EM research for copper interconnects is ongoing (though a relatively new field.)

A reduction of the structure (scaling) by a factor k increases the power density proportional to k and the current density increases by k2 whereby EM is clearly strengthened.

In modern consumer electronic devices, ICs rarely fail due to electromigration effects. This is because proper semiconductor design practices incorporate the effects of electromigration into the IC's layout. Nearly all IC design houses use automated EDA tools to check and correct electromigration problems at the transistor layout-level. When operated within the manufacturer's specified temperature and voltage range, a properly designed IC-device is more likely to fail from other (environmental) causes, such as cumulative damage from gamma-ray bombardment.

Nevertheless, there have been documented cases of product failures due to electromigration. In the late 1980s, one line of Western Digital's desktop drives suffered widespread, predictable failure 12-18 months after field usage. Using forensic analysis of the returned bad units, engineers identified improper design-rules in a third-party supplier's IC controller. By replacing the bad component with that of a different supplier, WD was able to correct the flaw, but not before significant damage to the company's reputation.

Overclocking of processors, especially when using higher than nominal voltage, causes electromigration between their transistors and significantly shortens the chips' lifetime.

Electromigration can be a cause of degradation in some power semiconductor devices such as low voltage power MOSFETs, in which the lateral current flow through the source contact metallisation (often aluminium) can reach the critical current densities during overload conditions. The degradation of the aluminium layer causes an increase in on-state resistance, and can eventually lead to complete failure.
 

Khriez

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In modern consumer electronic devices, ICs rarely fail due to electromigration effects. This is because proper semiconductor design practices incorporate the effects of electromigration into the IC's layout.

Phew.

Didn't understand most of the terms from that article, ICs.. huh ? what ? lol
 

ex_reven

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integrated circuits

eg - cpu

basically they are a silicon wafer with conductive circuitboards printed/stamped onto them

and they arnt saying its rare. theyr saying that it happens LESS at stock volts...and we arnt talkin about stock volts
 

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hey

im basin this on all systems if oc.ed ever since the start i bin going by the 50c rule or 40c for me

barton 3000+ 2.1gh 1.6v [ran 2.6gh at 2.2v for over a year fighting to keep under 45c] still running that cpu but is now comp #2 at 2.4gh lil cooler at 1.9v

allso 2 identical p4.s put toghther a p4 2.8gh 533fsb dident want 800fps for oc.ing resons an a asus p4 se800 i865 chip set
[both comps ar running 3.6gh full time under 45c onne is running a zalman cpns? 7000 the other the stock heat sink an fan modded by me now can hit 6500rpm @100%in bios istead of like 2500rpm only 1 of theas boards needed mods to ceep it cool the one with the zalman 7000
that tall heat sink dosent do shit for board cooling but that stick intel fan at 6500rpm does bit nosie thow hes using speed fan to up fan speed with cpu heat [both theas p4.s have bin runnen 3.6gh for just over 2 years] both guys have bin threw 3 or so psu.s they keep buying the cheap ones

things cant rilly cook if they dont get hot enuf

i normaly set up the system stock [what ever system it may be ] run a looping demo an tuch ever chip i see on video\board\evin sound an lan chips any that hit 45c or over bare i heat sink may just be one fin off a small heat sink for small chips but helps alot

the biggest thing that makes me laph is hard core water cooled systems with little no air flow or any board mods yeah the cpu is cool but i bet the board is cookin away

evin systems i get in at work that have bin runnen stock for 2 years alot of them look pritty chrispy nice broun tan marks an so on [south brige chips ar most comen rite now for burning that if seen] ther getting better at the mof set.s i still see a few thow evin a few 775.s allready 1 ati chip set board r200 i think or c200 south brige went no heat sink
an 2 intel boards both made by intel 1 was i915 the other 975 both mof sets crispyed

if seen un modded p3 board mof sets get hot enuf to like powderize just crumble apart when tuched an 2 cases of red glowing parts on a running system one was a gigabyte via kt400 socket a board memory power chip i think but still ran with the chip glowing an a ati 9700 i saw a wile ago one of the video codec chips was glowing agean card still worked evin thow theas chip look white burnt after shut down [both not my comps :)]

[if only ever killed 1 cpu it was from retarded cpu volts i was havin fun 1.7v celiron 1000mh tryen 1600mh at 3.2v i guess 2.8v was max lol]

an i had an fx5200 die from static i think just put it in one day an it was dead [vary raly do i have parts just die on me other then hd.s]

i have yeat to have any of my krazaly modded vid cards come back

i try not to sell my boards that have my krazy mods on them [sorry for my speeling guys]

knowin my luck thed try usen the volt mods an so on with stock air or sumthin allthow some of my mods could take it a bit

i hope i helped some how
 
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