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Doublechecking some Sandybridge facts

post #1 of 8
Thread Starter 
Hey everyone,
I'd like to check a few things regarding overclocking on Sandybridge. I've been further tweaking my overclocks and out of interest I've looked up some stuff online and people are saying very contradicting things.
My first doubt is, when it comes to VTT voltage (AKA QPI, QPI/DRAM etc.), does it really need to be increased when only the RAM is overclocked? I have an extreme chip so most of my overclock is done via multi, my bclk is 139.
My second and last doubt is, when does the QPI PLL voltage really need to be increased? I increased it to make my CPU stable at 6.4GT but I'm not sure what else is affected by that voltage.

Thanks a lot!

EDIT: also everyone always says that increasing the amount of RAM will lower the max possible overclock. I understand how that would be the case if we're adding more sticks (and ultimately using all slots), however I'm not sure if the myth applies to swapping existing sticks with higher capacity ones (and not changing the number of RAM sticks). Let's suppose the higher capacity memory can keep up with the CPU overclock.
Edited by Emmanuel - 3/15/12 at 7:57pm
    
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post #2 of 8
Thread Starter 
Come on people, I know it's not as easy as answering in the "250$ AX1200 worth it?" thread but this is interesting too.
    
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post #3 of 8
you will find most of your answers here ,enjoy this great guide
http://www.overclock.net/t/1189242/sandy-bridge-e-overclocking-guide-walk-through-explanations-and-support-for-all-x79-overclockers

Quote:
VCCIO: more commonly known at QPI/VTT voltage, this is the VTT voltage. Formally known as Processor Power for I/O it is the voltage for the integrated memory controller as well as the PCI-E controller. While Intel’s Maximum is 1.05 +/- 3% = 1.08v, you can go higher, much higher. I would recommend staying below 1.2v for 24/7 use, but depending on the quality of the IMC on your chip, I have seen 2133 MHz done on as little at 1.1v. I used 1.12v for overclocking my Dominator 1600 MHz to 1866 MHz, and it did it without any problems. Do realize that this voltage contributes heat as well to the whole thermal package
VDDQ: more commonly known as Vdimm or Vdram, this is the voltage for your memory. Formally known as I/O voltage for DDR3, Intel states maximum at 1.575. YOU should run this at whatever it says on your RAM. At the time I am writing this article, 1.575 is not the standard, but 1.5v has been stock voltage on many DDR3 RAM modules for a long time. While at 1.5v you can run at stock speed of 1333 MHz and SPD 9, 9,9,24 to run your RAM at a higher speed, such as 1600MHz, most RAM requires 1.65v. Do not be afraid, if it says 1.65v on your RAM stick, set it to 1.64 or 1.66v. For overclocking higher than what your RAM is rated for you can take this up, I have used up to 1.76v, but for my tests I used 1.72v to run my 1600mhz Ram at 1866mhz. I wouldn’t run this voltage over 1.8v unless you are going for some crazy high clocks.


source
Edited by coolhandluke41 - 3/16/12 at 6:36pm
    
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post #4 of 8
Thread Starter 
I appreciate the link but it hardly answers my question.
My question is pretty simple, will there be a difference going from 3*2GB to 3*4GB regarding my CPU OC stability? If yes is it the VTT that's going to need a little boost? I got a very sensitive IMC and I'm stable with absolutely no voltage increase at the moment.
Thanks!
    
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post #5 of 8
Quote:
Originally Posted by Emmanuel View Post

I appreciate the link but it hardly answers my question.
My question is pretty simple, will there be a difference going from 3*2GB to 3*4GB regarding my CPU OC stability? If yes is it the VTT that's going to need a little boost? I got a very sensitive IMC and I'm stable with absolutely no voltage increase at the moment.
Thanks!

It is true that more modules in a system puts more stress on the memory controller, so it is always harder to OC with more modules. I've seen this with DDR2 going from 2 modules of 1Gb sticks to 4 modules of 1Gb sticks. Then when 2Gb modules became affordable I swapped to 2 modules at 2Gb density and was able to OC much better. With my X58 platform, I saw this when I eventually maxed out my modules at 6x4Gb for a total of 24Gb. I currently run 32Gb in an X79 platform and see the same trend. So yes, more modules is harder to OC, and does require more voltage not only to the memory controller, but also to the ram modules themselves.


As for the density, It is known that the higher density modules tend to not run as high an OC as lower density. But loosening the timings have helped push the higher density modules. You will note with DDR3, that at each major density change, from 2Gb, to 4Gb and now to 8Gb modules, the primary timings have loosened up. But the 1366, 1155, 1156 and 2011 platforms seem to benefit more from memory speed then primary timings. Just go to newegg and check out the price premium for the higher density kits running lower cas timings. 4Gb modules at Cas 8 are much more expensive than Cas 9, and 8Gb modules at Cas 10 are much more expensive than Cas11.

If you want to know if getting 3x4Gb 1600 Cas 9 kit will be better than running your current 3x2Gb kit, it depends on what you want to do, beching would not be as good. For day to day noticeable performance differences, there wont be any. You can get 3x4Gb kits that OC to DDR3 2000 speeds, but probably not at Cas 9. You might want to check out the Samsung 4Gb 30nm modules. They are rated for DDR3 1600 Cas11 at 1.35v, but they are OCing to DDR3 2400 Cas 11 at 1.50v. I have 8x4Gb totaling 32Gb running DDR3 1866 cas 9 at 1.45v.
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post #6 of 8
Thread Starter 
Hey EricEOD, I remember you from the good old Asus P5E X38 days, glad to hear from you. Thanks for answering my question, I would REP you if I could.

How much voltage can the 30nm Samsung memory take?
    
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post #7 of 8
Quote:
Originally Posted by Emmanuel View Post

Hey EricEOD, I remember you from the good old Asus P5E X38 days, glad to hear from you. Thanks for answering my question, I would REP you if I could.
How much voltage can the 30nm Samsung memory take?

I've not been able to visit OCN as much as I used to, but I do stop in more lately! The modules are rated, according to the packaging, for 1.50v. They are the only 30nm modules I know of, so there is not a lot of testing/results out there on max voltage. I've seen people posting that 1.57v seems to be the highest voltage they get any increase in OC at, so most stay at around 1.55v max, which doesnt sound too high considering Samsung says they are rated for up to 1.50v.
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post #8 of 8
Thread Starter 
Thanks for all the info. Hope to see you around!
    
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