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hi im running 2x2gb of DDR3 ram at 1600mhz for a total of 4gb of ram i am wanting to know if it will be a good idea to install 2x2gb of DDR3 ram at 1333mhz will it just slow down my system or will the extra 4 gigs give me a boost in performance.

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It depends on what you're doing - in most cases, it would speed up your system. Your OS will be able to cache more frequently-used components, and you won't need to swap pages to disk as frequently, etc.

For use cases where you're working with small data sets and memory bandwidth is the biggest performance bottleneck, it might slow things down a bit, but this is probably not typical for most users.

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How would installing slower memory resulting in the underclocking of the existing memory speed up the system? – Ramhound Feb 10 '14 at 19:15
Because the benefit of having twice the memory outweighs the reduction in bandwidth resulting from the memory running 266MHz slower. Waiting for a disk drive is a huge bottleneck in most systems. Windows 7 aggressively preloads files, resulting in less load time for applications, and more memory will allow for more things to be cached, and less swapping. – user55325 Feb 10 '14 at 19:23

IF (the operative word here) the memory is compatible and will work together. There are so many variables (timings, brand, etc...) it most likely won't.

Theoretically you will get a performance boost just because you are using more RAM, but it will have to run at the slower RAM speed.

If you can swing the expense, buy a set of sticks in the about of GB that you need. Mixing and matching RAM doesn't usually end well.

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