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DDR4 Ram over voltage?

DDR4 Ram over voltage?
« on: November 11, 2016, 05:26:23 pm »
Hi guys

Hopefully this should be fairly straightforward

Recently upgraded my PC with a gigabyte ultra gaming x99 board and i7 5930k cpu,
along with 16gb of corsiar ram.

Everything seems stable enough however I just have one question, when running the
memory in XMP mode it increases the DDR4 voltage to 1.397 or so volts. I presume this
is because of the increased clock speed of both the ram and cpu.

But - considering Corsair state on their page that the maximum is 1.35v, is 1.397v safe?

I've also noticed the motherboard adds 0.2v when the memory is set to 1.2v too
(shows up as 1.22v ish) - is this to be expected?

The memory is CMK16GX4M2B3000C15 (2x 8gb), and its on the compatibility list for
this board.

I cant alter the voltage manually, the option appears to be ghosted



  • 1046
  • 31
  • Rev 1.1, BIOS F8
Re: DDR4 Ram over voltage?
« Reply #1 on: November 15, 2016, 05:35:50 pm »
This is fine as long as no instability occurs.  The LPX memory is the only one that seems to work consistently with the least amount of trouble/tweaking running above stock speeds. X99~z170.  You are basically .047 one thousandths of a volt over recommended voltage.  Since you are running 3000Mhz ram, this is going to happen because of the way XMP interprets JDEC standard and how Gigabyte programmed the BIOS. 

If the system runs stable, I'd leave it.  Or, you can review memory settings in MIT, disable XMP and set timings and voltage manually and see if you can get the same stability with a slightly lower voltage.  You won't hurt the ram where you are.  ;)
Z97X-UD5H\Corsair RM850w, 4790K, 16GB Vengeance, GTX970 FTW SC 4GB ACX 2.0, 850 Pro's RAID0 (boot), Black 1TB, Win10 Pro, Obsidian 450D
Nexus 6P Nougat

Re: DDR4 Ram over voltage?
« Reply #2 on: November 19, 2016, 03:00:44 pm »
Thanks for your reply!

Yes, everything seems stable enough - not had a single crash since putting everything together. But for the moment I've left XMP disabled as overclocking the cpu tends to cause the fans to spin up and make everything a little more noisy.

May have a go again at some point in the future if i find something that requires that bit more cpu power, but i think thats doubtful!