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I did a Google search and found this answer, but it's over my head I guess.
http://www.tomshardware.com/forum/314892-30-cl11-what-difference

So what's the difference between these two sticks of memory - both are the same price at Crucial.com $26.99

4GB
DDR3 PC3-12800 CL=11 Unbuffered NON-ECC DDR3-1600 1.35V Part #: CT3674415

4GB
DDR3 PC3-10600 CL=9 Unbuffered NON-ECC DDR3-1333 1.35V 512Meg x 64 Part #: CT3674401

So which would you purchase? The top one or the bottom?

Thank you.

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jimmywalt said:   4GB
DDR3 PC3-12800 CL=11 Unbuffered NON-ECC DDR3-1600 1.35V Part #: CT3674415

4GB
DDR3 PC3-10600 CL=9 Unbuffered NON-ECC DDR3-1333 1.35V 512Meg x 64 Part #: CT3674401


1333/9 is 2% faster than 1600/11, but in real life you won't notice such a whopping difference because of the CPU's caches. Some CPUs run faster when the memory clock rate is faster (Intel), other CPUs run faster when the CL rating is lower (AMD).

Worry more about the reliability of the memory than its speed. Crucial is a good choice for memory reliability, as is Samsung.



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