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post #6361 of 9345
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. :)


 



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.



 

Quote:
Originally Posted by shad0wfax View Post



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.


Sorry but that VDIMM-VTT difference limit of 0.5V does not apply to SB. You can ask munaim about this one and he will say the same.
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post #6362 of 9345
Thread Starter 
Quote:
Originally Posted by kevindd992002 View Post

Sorry but that VDIMM-VTT difference limit of 0.5V does not apply to SB. You can ask munaim about this one and he will say the same.

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post #6363 of 9345
Passed 1344 and 1792 with 1.675 PLLv and 1.435 vcore, but failed a 12 hour prime standard blend. So frustrating!
post #6364 of 9345
Add me to the list pls

700
post #6365 of 9345
Is there anything I need to do , to enable PCI Express 3.0?
Just got an ATI 7970 video card which uses PCI Express 3.0
I'm running a P8Z68-V Gen3 mb.
post #6366 of 9345
Uhh yeah you need to pop in an Ivy Bridge processor... Ohh wait there are not out yet wink.gif
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post #6367 of 9345
Hey folks

I currently have an Asus p9z68v-le motherboard

I have my 590 on the 16x slot

I will be recieving a sound card soon

I will insert it in the 4x slot but i believe i have to disable the onboard sound via the bios after uninstalling the drivers from windows.

Where can i disable onboard audio on the UEFI?

When i plug my soundcard do i have to enable anything on the UEFI?
post #6368 of 9345
Quote:
Originally Posted by kevindd992002 View Post

Sorry but that VDIMM-VTT difference limit of 0.5V does not apply to SB. You can ask munaim about this one and he will say the same.

 

Thanks for clarifying. Sorry for the confusion. (I hate it when I make mistakes!)

 

I knew that 1.650V was the limit for Sandy Bridge memory controllers, as I stated. I mistakenly thought that the VDIMM - VTT <= 0.50V applied to SB. The VDIMM-VTT delta applies to the older Lynnfield i5/i7 and Xeon 34XX series microprocessors. It was, and still is true for Lynnfields, but it's not true for the Sandy Bridge!

 

So I did more digging to find out why all of the newer DDR3 is 1.500V and not 1.650V anymore, even though 1.650V is the maximum for most SB motherboards. The answer that I found was in the JEDEC DDR3 SDRAM Standards. JEDEC are the folks who set the global standards for semiconductors and they set the DDR3 SDRAM standard to 1.500V, so most of what's sold now is 1.500V because of JEDEC not Sandy Bridge.

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post #6369 of 9345
Interesting. But what about 1.25v sticks? Can u crank it up to 1.6v ? And have it run at 2100mhz?
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post #6370 of 9345
Quote:
Originally Posted by madchemist83 View Post

Interesting. But what about 1.25v sticks? Can u crank it up to 1.6v ? And have it run at 2100mhz?


From what I've seen of the 1.25V low voltage DIMMs, they're geared toward moderate performance and very high electrical and thermal efficiency. I doubt that there is much OC headroom in an ultra-low voltage DIMM. You'll find more OC headroom in the 1.50V DIMMs, most likely.

 

I suppose that there are some factory 1.65V DIMMs that are ultra-high speed, like 2133, and if your motherboard is compatible with them, you may even get better performance from those units in a stock condition than you would overclocking a 1600 speed.

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