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Dec 26, 2013
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People say that when you buy a DDR3-1600 RAM you should get one that is 1.5V ? Why?

My motherboard only support DDR3-1600, can I use DDR3-1866?

Please answer both of my questions. Thank you for your help
 
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hunter315
A lot of the higher speed DDR3 a few years ago was 1.8V then Intel released the Core i series chips that had a memory controller that could only tolerate up to 1.65V, a more recent batch of chips now has a memory controller that recommends against exceeding the JEDEC spec of 1.5V. DDR3 chips are supposed to be designed/rated at 1.5V but by upping the voltage manufacturers can sell chips that are 'rated' at a higher speed but are really just OC'd versions of lower models.

TLDR1 - Only use 1.5V or lower modules if you are using a modern Intel chip or you can hurt your memory controller

You can use DDR3 1866, it will have a speed setting at 1600 MHz and your board will likely default it to there, you can manually set it to a higher...
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hunter315

hunter315

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May 12, 2009
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A lot of the higher speed DDR3 a few years ago was 1.8V then Intel released the Core i series chips that had a memory controller that could only tolerate up to 1.65V, a more recent batch of chips now has a memory controller that recommends against exceeding the JEDEC spec of 1.5V. DDR3 chips are supposed to be designed/rated at 1.5V but by upping the voltage manufacturers can sell chips that are 'rated' at a higher speed but are really just OC'd versions of lower models.

TLDR1 - Only use 1.5V or lower modules if you are using a modern Intel chip or you can hurt your memory controller

You can use DDR3 1866, it will have a speed setting at 1600 MHz and your board will likely default it to there, you can manually set it to a higher speed and it will likely work, but since most CPU memory controllers are only rated up to 1600 MHz anything over that is considered an OC so the board maker doesn't want to promise it will work.

TLDR2 - Maybe
 
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