Is a CL4 800 equal to a CL8 1600?

I have always been stumped on how exactly the CAS Latency works, so I don't know the answer to this question.
The RAM is faster as the CAS number goes down and as the speed goes up, but I don't know if it's in the same proportion.

Is a CL4 800 RAM stick equal to a CL8 1600 in general performance?
I'm wondering for both overclocked and not.
7 answers Last reply
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  1. You are right that "The RAM is faster as the CAS number goes down and as the speed goes up". But the CL4 800 RAM stick is not equal to a CL8 1600 in general performance, in general DDR3 1600Mhz cl8 will be better than the DDR3 800MHz cl4 or DDR2 800MHz cl4.

    http://www.behardware.com/articles/674-3/intel-p35-express-fsb1333-and-ddr3.html
  2. cin19 said:
    You are right that "The RAM is faster as the CAS number goes down and as the speed goes up". But the CL4 800 RAM stick is not equal to a CL8 1600 in general performance, in general DDR3 1600Mhz cl8 will be better than the DDR3 800MHz cl4 or DDR2 800MHz cl4.

    http://www.behardware.com/articles/674-3/intel-p35-express-fsb1333-and-ddr3.html


    I figured so. But I was thinking since it has half the Speed, but a Clock Cycle twice as fast it would equal out.

    For example, in the link you gave, in the WinRAR Compression time chart, the
    DDR2 1067 CL4
    beat the
    DDR3 1333 CL7
    in compression time. If I'm not overclocking, don't I want to have the fastest CL, and let the MHz be a minor choosing point?
  3. Does anyone know about the details of MHz and CL comparison?
  4. Shockeray said:
    Does anyone know about the details of MHz and CL comparison?

    MZ presents the frequency, it means the data rates per second.
    CL presents the CAS Latency. The data transfer process needs a row location, then a column location, then data gets out. CL defines the CLOCK cycles between column and data output.(because data needs some time to get out from memory cell to the outside world)
  5. I understand that, how do they compare? like is a CL11 1866 equal to a CL7 1600 because they are both moving in opposite directions?
  6. i doubt that you will see the diff based on everyday typical use. unless you're about benchies maybe
  7. I can't believe that no one knew the answer to that question, I finally found it in one of the tom's hardware articles...
    "...so DDR3-2133 CAS 10 still has the same response time as DDR3-1066 CAS 5. Moreover, DDR3-2133 continues to offer twice the bandwidth of DDR3-1066."

    (http://www.tomshardware.com/reviews/memory-bandwidth-latency-gaming,3409.html)
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