safe voltage for DIMM on i7-920

simviatoR · Dec 10, 2009

So after struggling with getting my i7 stable @ 4.4ghz, I raised the DIMM voltage to 1.66 in bios, and under load it shows 1.68 in e-leet tuning utility..

is this safe? my vtt is @ 1.39 (+200mV)

redduc900 · Dec 10, 2009

According to the i7 900 series datasheet, 1.875V is the "absolute maximum" Vddq (processor I/O supply voltage for DDR3). So with that in mind, and the fact that the Uncore / VTT / QPI differential voltage should be <= .5V, max. VTT is spec'd at an absolute of 1.35V. Using ultra high speed RAM like DDR3-2000MHz normally requires a higher than max. QPI voltage of around 1.40 - 1.50V, which still falls within the .5V differential spec., but is higher than what Intel recommends. So to answer your question, yes it's safe... 1.66 - 1.35 = .31V which falls within the range of <= .5V differential between DRAM voltage and VTT. Both voltages also fall within the absolute maximum spec's.

simviatoR · Dec 10, 2009

redduc900 said:
According to the i7 900 series datasheet, 1.875V is the "absolute maximum" Vddq (processor I/O supply voltage for DDR3). So with that in mind, and the fact that the Uncore / VTT / QPI differential voltage should be <= .5V, max. VTT is spec'd at an absolute of 1.35V. Using ultra high speed RAM like DDR3-2000MHz normally requires a higher than max. QPI voltage of around 1.40 - 1.50V, which still falls within the .5V differential spec., but is higher than what Intel recommends. So to answer your question, yes it's safe... 1.66 - 1.35 = .31V which falls within the range of <= .5V differential between DRAM voltage and VTT. Both voltages also fall within the absolute maximum spec's.

So VTT should not be any higher than 1.35? seems kinda low.

safe voltage for DIMM on i7-920

simviatoR

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redduc900

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simviatoR

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