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post #6351 of 9343
Quote:
Originally Posted by madchemist83 View Post

Looks good. Yeah u might need all 16 if u do video editing.

I just noticed this in CPU-Z...it shows my RAM as PC3-10700. I was under the impression that it was PC3-12800. Is that due to the fact that I have 4 sticks? Or am I not understanding something? (quite possible!)

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post #6352 of 9343
Quote:
Originally Posted by d3v0 View Post

Quote:
Originally Posted by dg2500k View Post

Did you check with this link at http://www.overclock.net/t/968053/official-the-sandy-stable-club-guides-voltages-temps-bios-templates-inc-spreadsheet ?
Seems to me 1.55 to 1.70 stable for PLLv
By the way located at Swissvale/Edgewood there thumb.gif
(I couldn't send you pm due limit reached daily allotment of 2 private messages per day) rolleyes.gif

Awesome, should get a beer or something sometime.

And regarding that post, yeah thats exactly what prompted me to test with the low PLL voltages. Really hoping to have some luck in that 1.55-1.7v sweet spot. But I am doing due diligence and testing a large range of voltages.


I too, recently discovered the wonders of reduced PLL. I'm operating this 4.9 GHz (stable so far) OC with a PLL = 1.550V. It wouldn't POST at 1.500V but it's operating wonderfully at 1.550V. I previously had it at 1.700V and my thermals were higher at 4.9 GHz than I'd have liked. The 1.700V PLL worked great at my 4.7 GHz OC though.

 

I'm happy that I'm still learning new things about my system, even as I read these threads. :)


 

Quote:
Originally Posted by am dew1 View Post

Quote:
Originally Posted by madchemist83 View Post

Terrible choice. Sell all of ur ram and get a proper one, just two sticks. U know what's wrong? Voltage is. For sb u want 1.5v ram. Both of ur kits run at 1.65v. Also 2 sticks will run faster then 4.

Thanks for the feedback. I have read many conflicting things about 1.5v vs 1.65v DRAM voltage for these setups...not sure who to believe any more. In any case, I reduced DRAM voltage to 1.5 in BIOS and all seems stable so far and I am running Prime95 at this very moment.

As for populating all the slots, I'm sure you're probably right that having only 2 sticks will be faster, but I'm willing to sacrifice a tiny bit of speed for not having to worry about running out of RAM while editing video as I do. And again, there are a lot of theories about whether or not you will run out of RAM with 8GB except in very unusual circumstances. It's a wacky hi-tech world out there with lots of varying opinions and theories to say the least.


The Sandy Bridge design maximum voltage is 1.650V for RAM. Most manufacturers are making 1.500V DIMMs to cooperate more nicely with SB and there are even a few ultra low 1.250V solutions available.

 

There's nothing wrong with using 1.650V DIMMs in a Sandy Bridge in some situations, but the 1.50V is a more common alternative now that works well in nearly all situations.

 

According to Intel, V DIMM - VTT <= 0.500V is the design specification.

 

VDIMM = Memory voltage

VTT = VCCIO = QPI = Voltage for the integrated memory controller and PCI-E controller.

 

Intel's VTT Max value is 1.05 +/- 3% which yields a 1.080V absolute maximum, although some people report going as high as 1.250V safely. (Others have gone higher but some have reported long-term problems.)

 

So with the Intel default values of 1.050V for VTT, and with the delta between V DIMM and VTT needing to be 0.500V or less, you get VDIMM - 1.05 <= 0.500V    Therefore VDIMM <= 1.550V This is where people come up with 1.50V for Sandy maximums.

 

So it's a bit more of a confusing answer. 1.650V is fine for DIMM as long as your VTT is 1.150V or higher. But Intel normally limits VTT to 1.050V, which results in memory limited to 1.550V and manufacturers remaining at 1.500V for a factor of safety.

 

I hope that helps clear things up.



 

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post #6353 of 9343
Couldnt get anything to pass with 4.8ghz. Been notching up since 1.5v PLL and now at 1.675, I am passing 1792 ffts and 1342. Now its time to prime my submission for sandy stable and run her all day!
post #6354 of 9343
Quote:
Originally Posted by d3v0 View Post

Couldnt get anything to pass with 4.8ghz. Been notching up since 1.5v PLL and now at 1.675, I am passing 1792 ffts and 1342. Now its time to prime my submission for sandy stable and run her all day!


It has been my recent experience that so long as you get the PLL high enough to POST and boot into your OS, that further increases in PLL have no positive impact on stability, but instead only increase the heat generated and the power consumed.

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post #6355 of 9343
Quote:
Originally Posted by shad0wfax View Post



I too, recently discovered the wonders of reduced PLL. I'm operating this 4.9 GHz (stable so far) OC with a PLL = 1.550V. It wouldn't POST at 1.500V but it's operating wonderfully at 1.550V. I previously had it at 1.700V and my thermals were higher at 4.9 GHz than I'd have liked. The 1.700V PLL worked great at my 4.7 GHz OC though.

I'm happy that I'm still learning new things about my system, even as I read these threads. smile.gif


 


The Sandy Bridge design maximum voltage is 1.650V for RAM. Most manufacturers are making 1.500V DIMMs to cooperate more nicely with SB and there are even a few ultra low 1.250V solutions available.

There's nothing wrong with using 1.650V DIMMs in a Sandy Bridge in some situations, but the 1.50V is a more common alternative now that works well in nearly all situations.

According to Intel, V DIMM - VTT <= 0.500V is the design specification.

VDIMM = Memory voltage
VTT = VCCIO = QPI = Voltage for the integrated memory controller and PCI-E controller.

Intel's VTT Max value is 1.05 +/- 3% which yields a 1.080V absolute maximum, although some people report going as high as 1.250V safely. (Others have gone higher but some have reported long-term problems.)

So with the Intel default values of 1.050V for VTT, and with the delta between V DIMM and VTT needing to be 0.500V or less, you get VDIMM - 1.05 <= 0.500V    Therefore VDIMM <= 1.550V This is where people come up with 1.50V for Sandy maximums.

So it's a bit more of a confusing answer. 1.650V is fine for DIMM as long as your VTT is 1.150V or higher. But Intel normally limits VTT to 1.050V, which results in memory limited to 1.550V and manufacturers remaining at 1.500V for a factor of safety.

I hope that helps clear things up.



 

But, how much should My VTT (VCCIO) be when my ram is 1.25v, running 1.35v in bios?
post #6356 of 9343
Quote:
Originally Posted by d3v0 View Post

But, how much should My VTT (VCCIO) be when my ram is 1.25v, running 1.35v in bios?


The VDIMM - VTT only needs to be less than or equal to 0.500V.

 

There's nothing wrong with having VDIMM at 1.250V and VTT at the default 1.050V and having the "delta" be 0.200V instead of 0.500V.  0.500V is just the max delta.

 

I recommend that you have your VTT between 1.000V and 1.100V.   Some people have gone as high as 1.250V for stability in some situations and other people have actually found that reducing it to 0.900V can help if their DIMMs are low power or slow frequency (high latency) units.

 

Generally, the higher the RAM frequency and the tighter the latency (often called CL or CAS) responds better with a slightly increased VTT, but that's not always the case.

 

 

VTT is only something you fine-tune in your OC to get your memory stable at your desired frequency after you've solved CPU stability issues. Typically, Vcore is where the bulk of your OC adjustments are made and many OCers have no need to adjust VTT from the stock 1.050V value.

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post #6357 of 9343
@shad0wfax thanks for clearing that up!

@madchemist83 .....seriously you say a false statement, I ask for proof and you don't have proof so why even comment about something you have only heard but do not solidly know..... I based my memory purchase due to this review and price. (i managed to grab this memory kit for $40 usd brand new).

http://www.tomshardware.com/reviews/corsair-vengeance-crucial-ballistix-kingston-hyperX,2907.html
^I Know Tom's isn't well regarded on OCN but give it a read it's pretty nice.
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post #6358 of 9343
You'll have to put in ram timings manually.
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post #6359 of 9343
Quote:
Originally Posted by madchemist83 View Post

You'll have to put in ram timings manually.


This is most likely true.

 

SPD will default to the most conservative settings in both cases if you mix and match DIMMs on a motherboard and sometimes SPD will get it right. However, SPD is not infallible and your system may still have stability issues with mixed DIMMs, so manual settings are more likely to be consistent.

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post #6360 of 9343
It's not a false statement. It's what majority of people say. We learn on our mistakes. How do you think people came up with all those guides and possible solutions? If that ram works for u .. Great . It's just u can't tell how it's gonna affect cpu life in the long run cause cpu only been out for about a year.
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