Well, as a former overclocker I know those voltages can spike and are dependent for a myriad of things so.... anyway, I was just looking for something more definitive from say... IntelNo, I just made this all up
Uh, yeah, just go to any enthusiast forum. It is a well-known practice of motherboard vendors.
Here is what my g.skill XMP 3200 does:
View attachment 16738
typical values (and values jdec run at are Vccio = .95 and Vccsa 1.05. This is 25% higher for Vccio and 13% higher for Vccsa. I can set the values manually to .95 and 1.05 and it runs fine. I run less volts tha this (1.12 and 1.16) the memory clocked to 3600..
It gets worse the higher your XMP (your RAM voltage increases the higher your XMP, and these apparently scale with that).
But yes, where possible (where possible = memory tweaking knowledge) manual setting is best. That said the vast majority of PC users aren't overclockers who are going to go through that mass of memory options just to set their memory, where a simple XMP works without harm.
Oh, and most serious overclockers I know aren't going to use XMP anyway since it locks in "pre-set values" - timings, speed, voltage. Values that may not be helpful to a successful overclock. Meaning, if you're a heavy overclocker, XMP may actually be a hinderance; if you're a light overclocker or non-overclocker, XMP is fine
Regarding the original question....
While this can be manually done.... Yes, you need to enable XMP to get those high speeds the RAM is sold at. If not, the RAM will default to a lower speed/timing/voltage setting. Fact.I was unaware that you need XMP enabled in the BIOS to reach higher DRAM speed.
My two cents :)
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