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How can i overlock my ram ?

post #1 of 8
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I mnew to this overclocking but want to learn? Whats the advantages and disadvantage of overclocking ram? is it safe? I have 12gb corsair xms3 ddr3
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post #2 of 8
Quote:
Originally Posted by Aknolidge View Post
I mnew to this overclocking but want to learn? Whats the advantages and disadvantage of overclocking ram? is it safe? I have 12gb corsair xms3 ddr3
Advantages are faster speeds, latencies, and more bandwidth usually depending on how you have it clocked. No real disadvantage unless you don't like giving your memory more voltage or increasing the voltage of your QPI/VTT. (No disadvantage, unless its unstable.)

Its safe, as long as your QPI/VTT and vDIMM are within a range of .5v. (Assuming you don't overvolt your RAM to a point where they die, same with QPI/VTT. )

If your ramoc failed, its usually because of too little qpi/vtt*, too little or too much uncore**, or too little vdimm, or because you are pushing it way beyond what it can do***.

I have personally never used 12gb of ram, but populating all dimms seems like it adds quite a bit of stress on the CPU's IMC, so your potential overclocks might be diminished as a result of running 12gb of ram (seems to stress out the IMC a lot, so 12gb can be harder to overclock).

Not sure about 12GB ram users, but with 6GB, IMC stress can be balanced out with more QPI/VTT reasonably well, but this usually only works when the cause of your instabillity can be blamed on the fact that the uncore has been increased or the IMC/NB Freq is running too fast. Higher Uncores will need higher QPI/VTT's to stabilize. But 12GB could require more, or even no extra QPI/VTT giving you stability could be the case .

What I would do is just see what IC chips my memory uses and see what overclocks people got on those sticks, just to get a good idea of what your RAM is capable of.

If you don't want to give your RAM more vDIMM or your CPU more QPI/VTT, try and see if you can tighten any of your timings a little more and still get a stable OC, but usually if you want results you need some damn good IC's or more vdimm. If you find that no matter what you do, your ram overclocks just keep crashing and turning out errors, I wouldn't worry too much, afterall, an overclocked 12GB ram kit is a lot of IMC stress.

* QPI/VTT is increased to stabilize your uncore if required. i7 950 requires you to run your uncore @ x2 your ram speed/frequency. Higher the uncore, more qpi/vtt usually is needed to stabilize.

** Uncore/NB Frequency has to be atleast *2 your RAM's frequency. To little is not possible, and too much is more stress, and usually requires more qpi/vtt to stabilize.

*** Yep.

That should be a good introduction into overclocking ram. Obviously, the speeds you can achieve depend entirely on your RAM.

Somethings to keep in mind:

QPI/VTT(uncore) must be in the same .5v range as the voltage of the dimms. A safe example is 1.35 QPI/VTT and 1.65VDIMM, those voltages are well within the .5v range.

An ideal maximum 24/7 QPI/VTT would be around 1.4QPI/VTT - 1.45QPI/VTT. This is above intels reccomendation but it is infact what most people recommend for overclocked / high frequency ram.


If you want to overclock the frequency of your ram without extra voltage, this often requires you to loosen your timings until they are stable. Loose timings = higher timings, tight timings = lower timings. Lower is better.

Hope this helped.
Edited by dTT05 - 2/7/11 at 8:34am
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^^??
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post #5 of 8
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Originally Posted by trojan92 View Post
^^??
It's an advertising spambot

Ignore it

EDIT: and report it too
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post #6 of 8
Quote:
Originally Posted by De-Zant View Post
It's an advertising spambot

Ignore it

EDIT: and report it too
Better yet i'll delete it.
post #7 of 8
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Originally Posted by alex98uk View Post
Better yet i'll delete it.
Oh right, you could do that


The requirement was 250 reps and 1 year, just like the oc'd account?
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^^??
EDIT: nvm , looks like the post you were referring to got deleted...
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