I agree.Quote:
Originally Posted by RunawayPrisoner
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I agree.Quote:
Originally Posted by RunawayPrisoner
The voltage still runs through the board before it goes to the CPU... you know. :) If your CPU is degraded, it'll require more voltages for higher overclocks, that's all. But if your board is damaged, it won't be able to take high volts anymore. Actually, stock volts (which are quite low) may still have troubles later on.Quote:
Originally Posted by 003
I switched mobo's to an asus rampage which is able to lock the vdroop. I have way more stability at higher clocks.
I believe there is no degration, and that 1.45v is not max. I've pushed my wolfdale (everest and coretemp readings) close to 80C and the cpu is still operating fine, passing stress testing at 4.3ghz 1.57v
So if your cpu is demanding more volts, and crashing..and demanding more volts, i believe it's the lack of load calibration/ too much droop causing instability.
Well do the test then push it up to 1.6volts and let her sweat, see if the CPU can continue to operate at the same voltage level 24/7... All I have seen is that some CPU's give in and require more volts than before, some stay stable...
It's hard to gather bulletproof information from anyone, as too many factors are involved... but if the CPU does the same on 3 different boards with 3 different ram sets and PSU's I am pretty sure it's either my inability or that the CPU that has degraded...
I sold my "degraded" Qx and the guy is pretty happy with it, but if I told the dude that it did 4ghz at 1.31 before and now almost requires 1.39volts he will be pretty pissed... and that was under high end watercooling...
I have no idea what caused it too degrade ( max was 4.6ghz for short benching sessions) was it the Vcore, CPU VTT, CPU PLL (never needed above 1.6 here), GTL voltages that made it degrade ? No idea really...:shrug:
You can do all the testing you want,as long as there is no 100% reliable info from Intel, I will still keep on advising my friends to limit max volts to 1.45 and FSB Term voltage to below 1.35 for 24/7 use on high end air or water... just to be on the safe side...;)
To claim degradation doesn't exist seems to be a harsh statement... there are many peeps out there that are not aware what they are playing with, but many many here are...
And they person that uses 1.55volts daily is using a pretty high end cooling setup providing sub zero temps 24/7... there's no way you can compare data between that setup and everyone else that use air or water cooling...
I believe degradation exists, but at this point, I will have to say that degradation is not caused by vCore. I have had my processor at up to 1.55v to prime, bench, kill, and basically for anything imaginable and it's still fine. I believe, however, that the degradations are caused by VTT being set too high. Remember back a few days please? What did Intel just confirm for Anandtech's dead QX9650?
In their specific case it was caused by CPU VTT or FSB termination voltage, though mine have never been above 1.4 at all... But in reality I really would like to know how Intel determined the cause of death ? I'm pretty convinced in my case that the 780i tests damaged the CPU... board I had had horrible Vdroop/drop and due to lack of time I didn't test the voltages at all with the DMM... I won't make that same mistake again...
How high was VTT when you put the CPU in the 780i board? I mean... if you can remember that much.
I believe degration exists too, but it doesn't with my e8400 and neither for my friend.
He uses 1.55 VTT and I use 1.5VTT and he uses 1.62v to sustain 4.2ghz while I use 1.57v to sustain 4.36ghz.
I haven't crashed yet. Prime stable, everest stress test stable.
Ever since my rampage has been able to lock the vcore unlike any other boards i've owned (0.01 droop, or no droop at all) my OC has been far more stable.
I'm wondering if the 1.45v max is tru too. I've just got a new e8400 and am having to run 1.525volts to reach 4.2GHz which was my target for 24/7 usage. But I'm wondering if that voltage is too high and I should settle for maybe 4Ghz at a lower voltage. I plan on keeping this setup for a couple of years at least and don't wanna kill my chip.
What do you guys reckon :confused:
thanks :toast:
I really believe that if you have a high vcore, but keep your temps nice and cool without much full load stress, your cpu should last indefinitely. It's some of the other cpu related adjustments that pose a short term threat. PLL at 1.6v is my cut off. 1.3v FSB term (VTT) is also my cutoff. Some may think that's high, but that what I'm personally comfortable at. People who go nuts on those adjustments are the ones that mutilate their cpus.Quote:
Originally Posted by oli_ramsay
1.525v seems a bit aggressive for 4.2ghz. I can't really compare my scenario to yours due to different configs, but 1.53v gets me to 4.5ghz pi stable.
Thanks, I've decided to settle for 4Ghz at 1.45v (1.416 load). Don't really wanna damage it as I don't plan on upgrading for a while now.
There has not been enough time to determine whether or not here is long term damage caused by 1.45v +. However there are many reports of degrading cpu clocks, some of these reports are from meticulous people whom I am inclined to believe.
Remember the old Northwoods? They were run at up to and beyond 1.75v (intel's stated absolute max for them) and they took it for months, then the reports of degradation began. Some degraded so badly they would not even run at stock speeds anymore regardless of voltage.
Intel give their safe max limits (vcore = 1.3625v, vTT = 1.155v, vPLL = 1.575v), and they base that on extensive testing, and the need to not have people returning their cpu's in X months due to degradation. As every electrical device degrades due to gradual electromigration (which is affected by temperature) over time, they have designed the cpu's to last a reasonable amount of time (years) at the said max voltages and operating temperatures.
To go beyond these stated safe max limits, is sure to degrade the cpu faster, perhaps in less than 12 months. Hence, only time will tell, but those limits are real limits, intel is not "lying" to us.
I would never feed a wolfie more than 1.38v for 24/7 clocks... Even the 1.55v max for 65nm seems a bit too liberal for me.
im given my e8400 1.465 at idle and 1.44 at load for just 4ghz which sucks big time. i dont know if its my settings or not but it needs high vcore to be stable and always has since i bought it. pll is at 1.5 and vtt is at 1.27 so them volts are low to me but dont seem to help bring the vcore down and raise those to be stable still. i just think i have a dud e8400 on my hands.:down: