Quote Originally Posted by saaya View Post
are you sure about this?
I checked with corsair and they said xmp doesnt set vtt...
and i chedked with one of our fae's, we tested several xmp profiles on the intel reference board and none of them change vtt...
hmmm
Yep I'm sure because.. I write XMP SPD profiles as part of my job

It actually depends on what revision the XMP profile is under.
The up-to-date spec, v1.2, specifies "QPI (Bus) Core Voltage Level".
This voltage is simply ignored when used in non-X58 (X48, X38) systems.

Previous XMP specs (any DIMM that has an old XMP profile on it) do not include this voltage,
and thus will not automatically set a QPI (un)core voltage.