Core i7 Vdimm/VTT Graveyard :D

[saaya]

so in other words part of it is hardware and the other part a LOT of playing around whit settings (or in other words the dude behind it)

now running stable whit 1900 9-9-9-24 t2 mem whit 1,654V mem and 1,47V qpi (maybe in near future some Vdimm overvolting and see if theese corsairs are worth the money )

i think its 60% hw if not more... good mem plus good cpu = high mem clocks, without much tweaking or high voltages...

check out anandtechs classified review, they were limited by samsung based mem i think, went to elpida based mem and wham, 20mhz higher bclock and higher mem clocks with tighter timings iirc...

Hello,

I don't know if this document has been referred to here before. Intel gives some clear numbers on voltages there...

http://download.intel.com/design/pro...hts/320834.pdf

See page 22 and 23.

Page 22 has a table of absolute maximum voltages, and page 23 gives us a number of nominal voltages on the single power panes.

Typical for VDDQ (VDIMM) would be 1.425-1.575/1.5V, and an absolute maximum of 1.875V on page 22.

The maximum for QPI/VTTA/VTTD should be 1.35V according to this. (there goes my theory! Oh well... )

Maximum core voltage is listed as 1.55V.

Intel's state ment of app. 1.875V on VDIMM fits well to ASUS' BIOS, which allows 1.9V. The extra voltages are only acessible through an overvolt jumper.

Maybe this helps a bit?

To my experiences, these limitations do not mean "More than that kills your processor", but normally "These are the limit that we, Intel, are guaranteeing nominal operation for as stated in this document."

you obviously didnt read this thread... the doc you mention is referred to in the first page of this thread, and the absolute max values are posted there :P

those values are the absolute max values a mainboard should not exceed at any moment. so voltages can vary and fluctuate but should never exceed those values or the chip MIGHT get damaged after some time or even die.
there were cases when cpus really did die if the max voltages were exceeded, but thats rather rare...

those numbers are more of a last line of slight guarantees on intels side as what they guarantee to work... beyond that, if anything goes wrong, your on your own and cant say its intels fault.

naokaji, thx
whats the sweet spot for vtt on your d0?
1.6? or rather below? i heard d0 has rather low sweet spots for vtt while c0 seems to have its sweet spot around 1.7v more or less