Official DFI LanParty UT X38-T2R(and LT) Discussion/Review/Overclock/Guide Thread

[Praz]

Ditto. I thought it was based on VTT, hence me asking for VTT values. I have been using the edge of stability charts for mine, but my system got a hell of alot more stable after I disabled manual GTL settings.

The charts only shows what values are needed to maintain the Intel specified 67% ratio of VTT to GTL. Most 65nm processorss are happier at a GTL value slightly higher then this. Any chart is going to be dead-on accurate for the board the voltages were taken from only. As a general reference the chart you are referring to may be off +/- 5 from one board to the next for one or more of the following reasons.

Difference between set VTT voltage in the BIOS compared to actual voltage.
The tolerance of the VTT divider circuit from which the GLT Reference voltages are derived.
The tolerance of the GTL Reference voltage divider circuit.
Trace impedance.
Individual Northbridge
Individual CPU.

The charts only shows what values are needed to maintain the Intel specified 67% ratio of VTT to GTL. Most 65nm processors are happier at a GTL value slightly higher then this. The GTL Reference voltages are not only based on VTT but as noted above are directly derived from it. The only thing of comparison that matters when setting the GTL values is the value of VTT.