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How harmful is long-term 1.5v vcore to a C2D when core temps are reasonable? - Page 2

post #11 of 46
Well it varies. I have had my 6400 running at pretty high vcore for a while and it showed signs of degrading but I am not sure if it was the cpu or mobo. I ran like 1.65vcore thru it for several months under phase. It runs at 3.2 with 1.4v under water now 24 hours orthos stable.

My E6600 has had 1.56vcore thru it for some time and it had 1.4 before that under water.

I tend to make a generalization, when you stop getting a mhz jump for voltage increase then you have found your sweet spot and should stop there. Like my 6600, under phase it gets 3960mhz at 1.54vcore but to run stable at 4.0ghz it needs 1.58 or so. So I leave it at 3960 for 24/7.

Another tip that some people like to follow is the .1vcore increase for type of cooling, so air 1.425, water 1.525 and phase 1.625, this is like a rough estimate.

But I dont have any cpu with long enough testing to say for sure what causes cpu's to stop working or degrade and at what voltages. It will proably be a few years before we start seeing peoples stuff becoming dead then well have a idea of actually how long the stuff last.
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post #12 of 46
As long as your temps are good, it should be fine. The detrimental aspect is that it indeeds shorten the lifespan, but not as significant as you would imagine it to be. Generally, you would have upgraded already. There are people who run @ 1.6V - 1.7V. Manage your temps and you'll be fine. Of course you must be stable.
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post #13 of 46
Quote:
Originally Posted by elwoodps View Post
Hi folks,

I'm setting up a dedicated folding rig out of mostly leftover parts and a new e6420. It's orthos stable @3200ghz (8x400) with 1.46v vcore and @3350ghz (8x419)with 1.5v vcore.

The difference in folding speed is significant: It cuts about 1 min off each 5000 steps folding a P2609 WU compared to 3200ghz. I think the improvement is due to both the increased speed and the increased bandwidth since I'm running the memory at 1:1 linked.

Core temps when folding at 3350ghz never go above 42c which is pretty good IMO. But how hard will it be on the processor to fold 24/7 at 1.5v vcore for months on end even if the core temps are reasonable?

Elwood
To tell you the truth, I advise not to pass 105% stock voltage for 24/7 operation. 105% of the Core 2 Duo is 1.4175, but you are good up to 1.425.

You can go above that safely for benchmarks and what not. However, sustained operations above 5-7% voltage could result in the death of your processor. It won't be sudden, but slowly your component will die. It will take more and more voltage just to keep it running.

Quote:
Originally Posted by vwgti View Post
You will be all set with 1.5 vcore. The long term effects will be minimal, and only shorten the 10+ year life span by 2-3 at most.
Please, if you are going to say something like this, have evidence to back it up. We are talking about $200-$300 worth of hardware here, we don't need you making this stuff up.

Do what you want with your own hardware, but don't tell others it is safe.

Quote:
Originally Posted by FrankenPC View Post
1.5 is nothing if the temps are good. I've seen VCORE as high as 1.675. So what if it only lasts 5 years. Who's going to be using a C2D in 5 years anyway?

Just like the obsession with 1:1 memory ratios, the whole VCORE thing is a techno-myth. Just ignore it. If you are orthos stable and temps are within acceptable range, you are GTG.
Techno-myth? Can you "Myth Bust" it? I don't think so. Your processor will slowly degrade. It won't run at 100% for 5 years at high voltages and then all the sudden die. It will be at 100% day 1, 99% day 10, 95% day 100, 80% day 200, ect. (Those days / percents are just an example)

Quote:
Originally Posted by CyberDruid View Post


How did you arrive at that conclusion?
I am with you.

Quote:
Originally Posted by dannyyboii View Post
As long as your temps are good, it should be fine. The detrimental aspect is that it indeeds shorten the lifespan, but not as significant as you would imagine it to be. Generally, you would have upgraded already. There are people who run @ 1.6V - 1.7V. Manage your temps and you'll be fine. Of course you must be stable.
This is just wrong!

I will provide technical documents tomorrow as to why you don't want to run high Vcore, regardless of temperature.
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post #14 of 46
Quote:
Originally Posted by <CRACK@> (CS:S King) View Post
wait a sec.. i have my NB at 1.55v i think.. is this safe? it'll ALWAYS be like this. i have a swiftech leet Copper cooler on it

I was referring to two completely different voltages. Form my observations and personal experience an MCH of up to 1.65 should be "safe" Stock is 1.55 or thereabouts--my AW9D-Max was lower be default than the Intel Spec for the chipset.

1.5 to a C2D is going to make a fair amounrt of heat. The P35 takes thisinto account--the latest chipset technology dampers voltage to the CPU and sense demand and rather than juicing the processor at all times it only provide the voltage required--hence it runs cooler and theoreticall shouldincrease the likfe of the CPU (edit)

That is why extreme coolingis required to promote stability.

But even though I ran on phase at 1.675 I doubt the processor is entirely unharmed.

I may get a chance to test that later this week.
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post #15 of 46
Paul you are right on the money--I think you may remember this thread about this important topic.
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post #16 of 46
I'd like to see proof to the contrary from the naysayers as well. This whole proof thing gets aawwwwful sticky in situations like these where no one can REALLY prove dick. A lot of anecdotal evidence at best.
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post #17 of 46
My anecdote is linked in my sig. I ran ICE at max Vcore and Max MCH for several weeks trying to maintain my maximum stable OC of 38something and sure enough it began to degrade. The board is stable only at stock volts and stock FSB

Take a look at the link in my post above.
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post #18 of 46
Quote:
Originally Posted by CyberDruid View Post
MCH is a bigger risk to increase than Vcore or so it would see--but running at 1.5 is well beyond the intedned operational parameters and will decrease the overall stability. When people imagine lifespan they think--oh all of a sudden it goes poof--but what happens is your OC becomes a little quirk--random freezes--the occasional failure to boot or a lock up or a BSOD that only happens every so often--then more often then finally no matter how much voltage you pound it with it does not OC at all and then finally it becomes unstable at stock and then finally it shows up on Bay

Except for the eBay part I know that story intimately.
already been plenty of threads from people wondering why they haven't been able to acheive the OC they did out of the box after just a few months of gunning it.

what the OP should do (imo) is find the absolute maximum he can get out of his setup then shave 10-15% off it.
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post #19 of 46
Hi Guys,

When discussing overclocking CPU's you need to take into account both Voltage and Temperature, they cannot be treated as separate parameters, they go hand in hand.

The main reason CPU's fail is due to electron migration.
Electron migration occurs when the flow of electrons through the CPU core architecture "jump gates" or erode the traces causing failure of the pathway or gate. This permanently disables this section of the cpu.

The main cause of this is elevated core voltage. As the voltage is increased the electron potential increasing the energy at the same time.

Temperature on the other hand plays a lesser role in CPU failure as Intel CPU have had "throttling" measures inbuilt into the architecture to prevent overheating.

For the older members of the forum, some of you will remember the older intel CPU's in particular the Northwoods.

These suffered from a recognised problem known as Sudden Northwood Death Syndrome (SNDS) whereby the CPU would have good load temperatures but at a certain voltage the CPU would just die, no slow decline..... Poof... Dead!

Im not saying that this would happen with the newer C2D processors but the electrical engineering principles are the same.

Remember its BOTH voltage and Temperature that shorten the lifespan of a CPU
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post #20 of 46
I use mine @1.5 everyday use,no 24/7 as long is the sweet spot for this chip.
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