Core i7 Vdimm/VTT Graveyard :D

[Charles Wirth]

Up to 2.3v for the past few months on several chips, many many hours.

No chip degradation, it wants to go faster.

I have had one on the Vapo for two months now, its at 2vmem

still scared?

[saaya]

VTT is the Uncore voltage that powers the L3 cache, memory controller and a part of the QPI controller, plus the integrated power management processor it seems. Default vtt depends on the cpu and is assigned depending on 3 vid pins. It seems to be between 1.1 and 1.2v, though most mainboard makers seem to ignore this and set 1.2v always, which results in up to 1.25v on some boards.

Up to 2.3v for the past few months on several chips, many many hours.
No chip degradation, it wants to go faster.
I have had one on the Vapo for two months now, its at 2vmem
still scared?

thanks charles,
roughly how many hours 2.3v have you run and with what vtt?
and roughly how many hours 2.0v with what vtt?
This was all below zero though, right?

tried that for regular testing..
vtt : 1.24v
vcore : 1.48v
vdimm : 1.84v

no problem at about 10hours run..

here what i see from intels datasheet,with a %10 range, i guess pushing vtt to 1.5v and vdimm to 2.1v will not be problem [DO NOT TRY because i said]

thanks for posting the pic
thats the theory, so yes, 2v vdimm should be fine 24/7, but thats apparently only with high vtt.
Our engineers killed 2 cpus with 1.9v vdimm and stock vtt after just a couple of hours of memtest86+
then again those were B stepping chips...

QPIV: ~1.45V (real) all the time.
VDram: 1.7V-2.05V depending of usage (2.05V is for benching and I used this voltage 15+ hours this weekend)

Hundreds of hours of basic testing without any problems in past two months.

roughly how many hours with 2v vdimm and 1.45v vtt?

my87csx481 I'm doubt about but it is true. My friend told me it after some Intel presentation in Ukraine.

no offense, but just because your friend heard this at some intel presentation doesnt really make it official

thanks for the feedback so far guys!