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Should i reset OC before installing ubuntu? - Page 2

post #11 of 30
Some custom kernels are better than others as well. I found better results using the ck-core2 kernel.
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post #12 of 30
Quote:
Originally Posted by EntTheGod View Post
some one posted that because the linux kernal more efficiently uses your hardware, your max stable OC will be SLIGHTLY lower in linux.... was some people tlaking about it in another thread not too long ago, cant remember what thread though
Greetz
I think you may be referring to my post in which I pointed out that since Unix based OpSys's have had SMP for so much longer than Windows, both at kernel level and also common software applications, that mulit-core CPUs are better implemented with less idle time for what Windows still sees as secondary cores, and more work == more heat.

On a historical note, IBM's OS/2 which is also a Posix system based in Unix, was so strict during install that it was fairly common to gave to turn off L2 cache on non-server quality systems, but could be turned back on once install competed. So the question is a valid one even though it has been extremely rare that I have had to back off for an install. However it is not at all rare that I back off some to compile a new kernel, just for peace of mind when dealing with such an "on the metal" level. .
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post #13 of 30
Well personally, if it's not stable in Linux I don't consider it a stable OC. It's not that linux uses the hardware more, it might be that it uses the hardware differently that would cause a flaw to show more. An unstable OC is an unstable OC, technically no OC is stable but I'm not going to get into that because it deals with measurements and situations that won't (shouldn't) happen. Whether or not windows causes a BSOD there is still a flaw.
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post #14 of 30
Sorry for the hijack post, but for the people who have installed windows 7 and have had problems with their OC, how large was the OC? Do you recommend reverting to stock with a format as well?
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post #15 of 30
For me with an i3 560 the difference was 4.40 ghz at 1.39v vs 4.35 at 1.4 v in arch Linux.

The bigger difference came with ht off where i could hit 4.57 stable in windows but still couldnt go higher in Linux.

I get the "if it's not stable in Linux it's not really stable" idea but the end result is what can be a usable oc in windows is not in Linux. Granted the difference is pretty small. The only real risk with not resetting the oc before installing is that it could hang at a bad time and cause problems or an install error.
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post #16 of 30
Quote:
Originally Posted by cavallino View Post
For me with an i3 560 the difference was 4.40 ghz at 1.39v vs 4.35 at 1.4 v in arch Linux.

The bigger difference came with ht off where i could hit 4.57 stable in windows but still couldnt go higher in Linux.

I get the "if it's not stable in Linux it's not really stable" idea but the end result is what can be a usable oc in windows is not in Linux. Granted the difference is pretty small. The only real risk with not resetting the oc before installing is that it could hang at a bad time and cause problems or an install error.
The thing is, you only need one bad bit of data to mess up an entire installation. Given there is a lot of redundancy theses days but it can still happen. Linux just so happens to not let these small data errors go unnoticed. I will get MCEs if I don't have my IMC 1.25~1.30v, errors every time but will still run. Now if I get rounding errors in the die, vcore too low, linux will crash where Windows will ignore/fix the errors (or try) and continue running. The problem isn't about code, it's more about how strict linux is on how code executes. Linux isn't as lenient as Windows, the OC is still just as unstable but you are just told about it up front instead of some crazy error days/months/years down the line.

[edit] Bottom line: It's the same OC and same stability problems; Linux just won't let you get away with as much bull**** as Windows.
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post #17 of 30
Quote:
Originally Posted by mushroomboy View Post
The thing is, you only need one bad bit of data to mess up an entire installation. Given there is a lot of redundancy theses days but it can still happen. Linux just so happens to not let these small data errors go unnoticed. I will get MCEs if I don't have my IMC 1.25~1.30v, errors every time but will still run. Now if I get rounding errors in the die, vcore too low, linux will crash where Windows will ignore/fix the errors (or try) and continue running. The problem isn't about code, it's more about how strict linux is on how code executes. Linux isn't as lenient as Windows, the OC is still just as unstable but you are just told about it up front instead of some crazy error days/months/years down the line.

[edit] Bottom line: It's the same OC and same stability problems; Linux just won't let you get away with as much bull**** as Windows.
I get it makes sense when you put it that way.
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post #18 of 30
Greetz
I wholeheartedly agree with Mushroomboy's assessment of how strict and lenient various OpSys are or can be and that Windows has more "slop" which is designed in as a concession to wide compatibility, one size fits all since it's kernel cannot be reconfigured and recompiled by mere mortals ... well, not legally.

However I emphatically disagree that technically no OC is stable. All machines, whether mechanical, electronic, or even software are designed to operate under a specific set of conditions and with a given amount of headroom. If you imagine a car whose top speed is exactly the highest legal speed limit you may feel how poorly such a design would actually perform at highway speeds, maxed out all the time. If you tweak that engine for higher revs, the engine will suffer in some way... unless you offset the effect of higher revs with better lubricant and/or a larger radiator.

The advertised speed of a CPU is arbitrary and set by risk assessment based on expected operating conditions. Change those conditions and you change the performance curve as well as the risk... hopefully in the correct direction and in an harmonious way.
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post #19 of 30
Quote:
Originally Posted by enorbet2 View Post
Greetz
I wholeheartedly agree with Mushroomboy's assessment of how strict and lenient various OpSys are or can be and that Windows has more "slop" which is designed in as a concession to wide compatibility, one size fits all since it's kernel cannot be reconfigured and recompiled by mere mortals ... well, not legally.

However I emphatically disagree that technically no OC is stable. All machines, whether mechanical, electronic, or even software are designed to operate under a specific set of conditions and with a given amount of headroom. If you imagine a car whose top speed is exactly the highest legal speed limit you may feel how poorly such a design would actually perform at highway speeds, maxed out all the time. If you tweak that engine for higher revs, the engine will suffer in some way... unless you offset the effect of higher revs with better lubricant and/or a larger radiator.

The advertised speed of a CPU is arbitrary and set by risk assessment based on expected operating conditions. Change those conditions and you change the performance curve as well as the risk... hopefully in the correct direction and in an harmonious way.
Right but the thing is no CPU is technically stable, but the amount of decay and instability can be minimized so much that you wouldn't ever notice it. Technically when you are getting into OC you are shaving off the life cycle of the hardware, but that's why I said I didn't want to get into it.
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post #20 of 30
Greetz
The below linked article from Anandtech is so good it should probably have a thread all it's own. I heartily recommend it to anyone regardless of OpSys who has any interest in how CPUs function, stability and overclocking, and frankly, if you don't then why are you here? The article is highly technical but with the aid of graphs and excellent writing the n00best of n00bs will get something from it. I promise.

Se it here.... http://www.anandtech.com/show/2468/6
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