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Skylake and DDR3 memory? How that works?

post #1 of 8
Thread Starter 
Hi guys, I would like to figure a question. I am sure the Skylake memory voltage has been discussed before, but I would like to know the details.

I know that it is not advised to use DDR3 1.5v or 1.65v memory because this forces the integrated memory controller. But is there a way to worthily lower the values of VCCIO and VCCSA to the recommended Skylake levels and use a DDR3 1.65v memory for example?

Would that mean that you need to lower the memory clock or (elevate) timings so much that it makes no sense on doing it or can you use a DDR3 1866Mhz at 1.65v and stock timings and at the same time set proper voltages for VCCIO and VCCSA using a Skylake processor?

Are these values that flexible? From my experience with overclock, there is always a compromise, and if Skylake uses 1.25v memory, to adjust a 1.65v memory would become a moot point and compromise the memory performance in timings or clock.

Could someone explain how that works and if there is any sense in using DDR3 and adjusting VCCIO and VCCSA? Not to mention that not all motherboards allows you to change voltage values.

I appreciate any info,
Regards,
Edited by Contiusa - 9/29/16 at 12:05pm
post #2 of 8
You don't -have- to run your RAM at 1.65v. Reasonably lower the voltage of it until it doesn't act right, and tweak from there (frequency, timings, etc).

You might not get speeds as high and timings as low as you want, depending on how aggressive the rated speeds/timings are.
post #3 of 8
Been running my DDR3-2400CL9 at 1.65v since I went to the Skylake platform. No problems. Most of the fear mongering comes from an unverified editorial post by MJ Sexton (not even old enough to drink). Running high speed DDR3 is no more detrimental than it was on previous platforms like Haswell and Ivy which only officially supported up to DDR3-1600 respectfully.
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post #4 of 8
Not concerned about the speeds. More concerned about a memory controller designed around running memory 0.3v lower than the previous generation. I mean, using RAM with 1.65v connected to a SA running at only 0.8-0.85v sounds dangerous to me.
post #5 of 8
Quote:
Originally Posted by ssateneth View Post

Not concerned about the speeds. More concerned about a memory controller designed around running memory 0.3v lower than the previous generation. I mean, using RAM with 1.65v connected to a SA running at only 0.8-0.85v sounds dangerous to me.

If you are afraid, then don't overclock rolleyes.gif
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post #6 of 8
Thread Starter 
Quote:
Originally Posted by damric View Post

If you are afraid, then don't overclock rolleyes.gif

Thanks, but do they run (DDR3) at recommended VCCIO and VCCSA voltages if you don't overclock? I think it is something between 1.25v and 1.35v (not the Vcore). From what I read, I think the problem is with the XMP profiles that were taking the voltages way higher than the recommended.
post #7 of 8
If you leave everything in auto, your motherboard will use safe JEDEC approved voltages. If you are using xmp it may overvolt as necessary. I suggest you manually tune your overclock and voltages yourself.
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by damric View Post

If you leave everything in auto, your motherboard will use safe JEDEC approved voltages. If you are using xmp it may overvolt as necessary. I suggest you manually tune your overclock and voltages yourself.

Cool, thanks. Good to know thumb.gif
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