Help with voltage settings for 8GB ram w/ OC'd specs


I just ordered another 4GB of the same G-SKill as below (promo sale) and was wondering what the voltage should be to maintain the OC at 1950 for 8GB.

My Mobo has a OC voltage switch which allows ram to get up to 2.5V (2.0V max with switch off). Any thoughts to what the voltage should be? Can i OC 8GB of ram safely with my setup?

CPU runs idles around 35C, system 24C - been stable for 4 months (since i built it)


Intel Core i5-750 Lynnfield 2.66GHz (w/ Cooler Master Hyper 212 Plus + Delta 3200rpm cpu fan) - OC'd at 3.71Ghz
4GB G.SKILL Ripjaws Series (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) - OC'd at 1950mhz
SAPPHIRE Vapor-X Radeon HD 5850 (Cypress Pro) 1GB 256-bit GDDR5 - OC'd 765mhz
ASUS P7P55D Deluxe LGA 1156 Intel P55 ATX Intel Motherboard
Intel X25-M Mainstream SSDSA2MH080G2R5 2.5" 80GB SATA II MLC (SSD)
Western Digital Caviar Black 1TB 7200 RPM
Antec Nine Hundred Two Black Steel ATX Mid Tower
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  1. Best answer
    Wow I really suggest you turn your overclock down and voltage levels now (if you are using anything higher than ~1.65V). Intel's specified limit for memory voltage is 1.65V, 1.7V is fine but 2.5V?? Seriously you'll fry your Core i5's memory controller in a few weeks or months. Keep the RAM speed back down, there's not much of a difference between 1600 MHz and 1950 MHz. Otherwise for voltage keep it at 1.65V or the maximum that G.SKILL recommends.
  2. Thanks for your reply. I looked up my voltages in the bios:

    CPU core = 1.28v ( @3.71)
    IMC = 1.262v
    DRAM = 1.600v (@1950mhz)
    CPU PLL = 1.812v

    It seems like from what you said and other research online that the cpu controller is the limiting factor and recommends the dimms voltage stay under 1.65v - since im currently under that @ 1.600v - would it be possible to change it to 1.65v for the 8gbs @ 1950?

    My mobo is pretty smart in the fact that it automatically reduces the CPU ghz and voltage when Im doing non intensive things - so its not like the cpu is running at 3.71 24/7.

    Does this change your opinion?
  3. Try adding the .05 volts as this should be under warranty no?
    2.5 volts on DDR3?! Most DDR2 does not use over 2.2-2.3.
  4. Best answer selected by Statz22.
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