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My motherboard states it supports DDR3 1066/1333. Can I purchase DDR3 1600 and expect my system to drop it down to the highest level the motherboard supports?
Will this change the Cas Latency or timing? Is it like a power supply where you should buy the largest possible so it is more efficient?
The second statement is not really accurate. Power supplies have non-linear efficiency curves - a larger power supply is likely to be more efficient than a smaller one at the power draw you use it. However, if you go too far and buy a completely over-powered supply, it may be less efficient than a smaller one. See for example http://www.anandtech.com/show/2624/3. There may also be some implicit effects, such as larger supplies being more niche, higher priced and better components (don't count on this).
– Sam Brightman – 2016-11-22T08:26:45.4176I would note that buying a larger power supply than you need tends to help its longevity (it's not running at as high a percentage of max load so it's under less stress so it's getting comparatively less wear and tear) but that's not the same thing. (Perhaps it's what caused this misperception, though.) – Shinrai – 2011-06-20T22:31:31.290