Quote:
Originally Posted by Jaskanwar Singh
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The voltages depend on the DDR technology ... as specified by jedec
for DDR1 it was 2.3V (i don;t remember clearly)
for DDR2 its 1.8V
for DDR3 its 1.65V
All new generations rams have customs profile viz.. EPP , etc.. a.k.a extended profiles along with default stored in an SPD chip.
Custom Memory Voltages/Timings will be applied if the BIOS has no probs in applying the setting read from the spd chip or you it will be set to defaults given by jedec.
In that case u have to manually set the rated voltage in BIOS.
Like in my case i have 2x2Gb corsair DHX sticks rated at 4-4-4-12 @ 2.1v @ 800Mhz but when i leave it to the bios it discards the EPP profile and applies defaults viz.. 5-5-5-18 @ 1.8 so i have to manually set the timings and voltages.
Quote:
Originally Posted by pulkitpopli2004
well yeah each mobo supports only particular memory voltage...
till nw as i have seen.. evry mobo was given with 1 JEDEC standard voltage which is usually 1.5V and overvoltage which was 1.60V and 1.65V.. dis was in case of P55 mobo(which i saw)..
in LGA775 package supported volg is 1.8V..
in Q57 it was 1.2 to 1.7V
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aaaaahh sorry dude but u r wrong imo... coz memory volts is decided by the memory controller on the northbridge/CPU or by the DDR version.
for DDR2 jedec specified 1.8V as standard / ref
for DDR3 jedec has specified 1.65V as standard / ref
even if LGA775 mobo has DDR3 slots then that mobo has to supply the sticks with jedec standard voltages i.e ~ 1.65V
Bottom line the voltages are decided by DDRx !!!
BTW u can change the voltages if ur BIOS supports... hence each mobo doesn't support particular mem volts but a range of volts depending which DDRx it supports
memory voltage
Linear Mode
