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Applied memory voltage higher than set voltage on Maximus VI Hero

M

mmaestro

Member
Hello all.
I have a system I'm in the process of testing having just built with a Maximus VI Hero board, i7 4770K, and G.Skill Trident X DDR3-2400.
The issue I'm having is I'm a bit concerned that the voltage being applied to the memory when using the XMP profile is a bit higher than the already high 1.65V in the profile: if the memory on the board is set to run at 1.65V, I'm seeing 1.665-1.670 applied to the memory. I can drop the voltage down and see the applied voltage drop by roughly the same amount, so a setting of 1.64 yields roughly 1.655-1.660. My understanding was that going above 1.65V over the long term (I need the system to last 3-4 years) is not a good thing.
I guess the first question is, is that true? What's a good, long term safe voltage?
And second, how concerned should I be that the voltage being applied to my memory is higher than the voltage I've set? Should I be looking at something in particular to change to try to drop that down so they match, is there an issue with the board? Any guidance would be greatly appreciated.
Thanks.
 
Just for future reference, I had also posted this on the Asus RoG forums and got a reply from Raja there on the subject. Here's what he said:
You have nothing to worry about there. The monitoring IC will just measure at a certain point of the power plane and that can be higher than at the IC on the DIMM (due to interconnect losses).

The voltage Intel stipulates as maximum are based on voltages at the processor land/pads - that is after all resistive losses (Ohm's law). The voltage needs to be set higher than 1.65V to ensure the actual voltage at the DRAM modules is close to 1.65V under all loading conditions.
Click to expand...
I don't love that the voltage the system displays isn't actually what's hitting the RAM, but I can live with that as long as it's staying in the range I want. What I didn't get a reply about, and something I'm still interested in, is what a "safe" voltage would be for memory in the longer term. Is this the same as Sandy/Ivy, where running over 1.65V has the potential to fry the memory controller on the CPU, or have things changed significantly since then and this is less of a concern? Is the "safe" voltage higher? Lower? I've been Googling for this and I've been unable to find a definitive answer.
 
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