What should 1.7 Volt DDR3 be set to on X58 chipset Socket LGA 1366 boards?

c627627 · Dec 7, 2011

What should the voltage be reduced to? Should timings be increased to account for reduced voltage?

_____________________
Intel i7 950 [200] BCLK x 20 = 4.0 GHz @ [1.4000] CPU Voltage & [1.35000] QPI/DRAM Uncore Voltage, Batch 3029A40
3 x 1GB G.SKIL DDR3 1333 (PC3 10666) [DDR3-1691MHz] 10-10-10-24 @ 1.64 DRAM Bus Voltage
ASUS P6T Deluxe v.1 [LGA 1366 Intel X58] BIOS 2209
Thermalright Ultra-120 eXtreme 1366 RT with 120mm Scythe S-Flex F fan
ASUS EAH4850 Radeon HD 4850 1GB DDR3 @ 625 MHz GPU & 1986 MHz Memory
OCZ Agility 60GB SSD
Asus Xonar DX sound card
Antec nine hundred case, two front 120mm fans, one back 120mm Fan, one top 200mm fan
Corsair CMPSU-750TX 750W

freeagent · Dec 7, 2011

You should be ok with 1.25v, Ive never given that much vdimm on ddr3 before, so if I were to do it this second, Id probably use 1.3-1.35

Maybe 1.375? Im ok with 1.425 or so, but things are running quickly at that point (ie 3800 unc

)

freeagent · Dec 7, 2011

Sorry, I was thinking of what qpi voltage you should use if you were to be useing 1.7v on the stix, my appology's

Knufire · Dec 7, 2011

You could loosen timings, the thing with DRAM voltage is that it has to be set within ___ amount (I think it's 0.5V) of another voltage, which stock is at 1.15. Bump that voltage to 1.2, and you should be able to run the RAM at 1.7 fine.

Bobnova · Dec 7, 2011

DRAM voltage should be within 0.5v of VTT. As long as that is true it doesn't matter overly much what the ram voltage is.

Knufire · Dec 7, 2011

Is there really a max "safe" voltage for DRAM, as long as you're keeping an eye on temps?

c627627 · Dec 7, 2011

Oh yeah. It's been almost three years so I forgot but now I remember:

c627627 said:
DRAM Bus Voltage ... As long the difference between DRAM Bus Voltage and QPI/DRAM Uncore Voltage is less than 0.5 volts, we can ignore Intel's warning and go over 1.65 Volts if needed.

Woomack · Dec 8, 2011

Knufire said:
Is there really a max "safe" voltage for DRAM, as long as you're keeping an eye on temps?

Max voltage for DRAM depends from IC and for latest intel platforms also from IMC. I never had problems running high voltage for DRAM on X58 or P67 boards ( like 1.8-2.1V ) but I'm not setting it 24/7.
Latest ICs like new Hynix chips don't like high voltage or anything above 1.6V ( you can find them in many 4GB sticks ). The same for most PSC or other brands. 1.65+V is almost only acceptable for old IC ( like older than a year

).

c627627 · Dec 8, 2011

Speaking of really old RAM sticks, I got this one in 2008, should I replace my 3x1GB with this 2x2GB, it's for a 32-Bit system so the extra Gig is not as important [I can keep one of these two sets]:

Woomack · Dec 8, 2011

You lose triple channel so about 2GB/s bandwidth and you get lower latency. I'm not sure if it's worth it when you are running on 32bit system. Probably on 1.7V you will be able to set these G.Skills to 1600 or at least 1333 8-8-8.
I still have 3x1GB OCZ 1600 CL7-7-7 on Qimonda chips that were going up to ~1900 7-6-6 2.1V

also from about 2008.

c627627 · Dec 8, 2011

Right now I am at
3 x 1GB G.SKIL DDR3 1333 (PC3 10666) [DDR3-1691MHz] 10-10-10-24 @ 1.64 DRAM Bus Voltage

I think I'll probably stay that way.

Woomack · Dec 8, 2011

Did you try anything with CL9 ? Maybe up to 1.68-1.70V and a bit higher VTT like +0.10V.

What should 1.7 Volt DDR3 be set to on X58 chipset Socket LGA 1366 boards?

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