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Memory Voltage on Sandy Bridge

post #1 of 16
Thread Starter 
I have seen many people scared to go above 1.5v. I was just reading some RAM reviews and came across this:
Quote:
The former platform’s documented maximum 1.575 V limit remains, with the same wink-and-a-nod from engineers that up to 1.65 V is safe. Indeed, the memory controller built into Intel's new processors remained substantially similar to that of its predecessor.

source

So don't be scared to run 1.65v!
Edited by Dopamin3 - 6/17/11 at 9:43am
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post #2 of 16
I'm not. Been running 1.7v since I put mine together. tongue.gif
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post #3 of 16
Thread Starter 
Quote:
Originally Posted by pioneerisloud;13904052 
I'm not. Been running 1.7v since I put mine together. tongue.gif

I'm glad you manned up. Hopefully this will encourage others to man up, because it's sad when I come across threads people worrying about running higher than 1.5v.
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post #4 of 16
Quote:
The former platform’s documented maximum 1.575 V limit remains, with the same wink-and-a-nod from engineers that up to 1.65 V is safe. Indeed, the memory controller built into Intel's new processors remained substantially similar to that of its predecessor.

If the memory controller is remained substantially similar to its predecessor and the delta between the IMC and RAM with those was okey with not more then 0,5v.

VCCIO on SB is 1,05 (default) if I´m not misstaken and with ram @ 1,65 thinking.gif it should be a delta of 0,6v, so with SB it´s okey with 0,6 without the IMC degrade headscratch.gif



BTW: source link doesn´t work for me.
Edited by Ghostleader - 6/17/11 at 3:11am
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post #5 of 16
Thread Starter 
Quote:
Originally Posted by Ghostleader;13904408 
If the memory controller is remained substantially similar to its predecessor and the delta between the IMC and RAM with those was okey with not more then 0,5v.

VCCIO on SB is 1,05 (default) if I´m not misstaken and with ram @ 1,65 thinking.gif it should be a delta of 0,6v, so with SB it´s okey with 0,6 without the IMC degrade headscratch.gif



BTW: source link doesn´t work for me.

Fixed the link. The 0.5v difference doesn't apply to socket 1155 processors, only 1366 and maybe 1156 (which I'm unfamiliar with).
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post #6 of 16
Quote:
Originally Posted by Dopamin3;13907055 
Fixed the link. The 0.5v difference doesn't apply to socket 1155 processors, only 1366 and maybe 1156 (which I'm unfamiliar with).

proof.gif
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post #7 of 16
Thread Starter 
Quote:
Originally Posted by Ghostleader;13907721 
proof.gif
Quote:
Sandy Bridge does not require there to be a maximum of 0.5v between the VDIMM value and the VCCIO and VCCSA values when 1.65v voltage modules are used.

source

And they also talk about 1.65v voltage being fine.
Edited by Dopamin3 - 6/17/11 at 11:31am
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post #8 of 16
Quote:
Originally Posted by Dopamin3;13907986 
source

And they also talk about 1.65v voltage being fine.


You have to excuse me because just as Toms says it´s okey, there´s other who says the opposite, like for example bit-tech.net
Quote:
It's worth noting, especially if you use older DDR3 memory, that you need to keep the VCCIO/VCCSA and memory voltage within 0.5V of each other. This follows on from the same rule set by Nehalem and Lynnfield, but given that the whole Sandy Bridge die is now 32nm and operates at a lower ~1.15V voltage, mixing this with older 1.65V+ DIMMs puts it on the fringes of acceptable long-term reliability.

and therefore I ask for some proof, clunk seems like a more reliable source then both the former in my eyes, thanks for bring it to my attention


So, it seems like one don´t have to worry so much about the voltage between the VCCIO and the ram and more so one can probably go all the way upp to 1,7 with the ram, but why is there a roof at 1,65 - 1,7 for the ram, why not 1,8 or 2,0?

Sure like to know more about how it works.



Thanks once more and please excuse me for straight forwardness (proof.gif) but I´m a straight forward person and as english is not my native language I can sometimes get short-spoken even though it doesn´t seems so with this post.
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post #9 of 16
Even if that's true, VCCIO + 0.5v = max vDIMM, I guess I'm still safe. My VCCIO is at 1.20v. so I'm technically fine up to 1.70v on my vDIMM then. tongue.gif

But honestly, there's no harm in running 1.60-1.65v RAM on Sandy Bridge. The DDR3 standard is 1.65v.
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post #10 of 16
And many 1.65 V RAM work with lower voltage on SB.
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Overclock.net › Forums › Components › Memory › Memory Voltage on Sandy Bridge