Asus Rampage III Extreme memory compatibility

By Jesse
Aug 13, 2010
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  1. I recently purchased am Asus Rampage III Extreme mobo for my first enthusiast build in several years, and I have some questions about which memory its compatible with.

    On newegg, the specifications state that these frequencies will work: DDR3 2200(O.C.) / 2133(O.C.) / 2000(O.C.) / 1800(O.C.) / 1600 / 1333 / 1066.

    Does that mean that I can put DDR2200 memory in that mobo, or that I can overclock DDR1600 up to 1800, 2000, 2133, or 2200?

    Thanks for your help!
  2. dividebyzero

    dividebyzero trainee n00b Posts: 4,705   +589

    The overclock RAM bandwidth is dependant upon overclocking the CPU for the most part since CPU and RAM frequency are linked by fixed divider ratio's. Overclocking RAM is usually a by-product of overclocking the CPU.
    If you are looking to get the RAM to DDR3-1866+ speeds you should be looking for a faster kit. DDR3-1600 in general will not reach past 1900 for the most part*- if it did then it would be sold as a faster kit.
    Buying a DDR3-2000 kit (for example) gives supposed headroom for overclocking, plus has the standard JEDEC RAM profiles embedded within it (DDR3-1066, -1333, -1600) for operating with a non-overclocked CPU. This range of utilisation (along with the higher speed bin) is why faster kits sell for a premium.

    * This is assuming the RAM is not over-volted. While the Core i7/i5 CPU's have a maximum memory voltage of 1.875v ( Intel spec pdf Table 2-6, pg.22), I believe any CPU damage that occurs using a voltage over Intel's 1.65v recommendation is not covered by warranty.


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