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CAS Latency Real-World Effects?

I've decided that for my first build 8GB of RAM (2 x 4GB) will probably be more than enough for gaming. Now I need to know how much of a real-world effect CAS latency will have on my performance. By "real-world" I mean that obviously DDR3 1600 RAM running at 7-7-7-24 is faster than the same RAM running at 9-9-9-24. But, will I notice the difference in FPS or system responsiveness? If not I'll save a decent amount of money and go with the CAS 9. Here are the three sets of RAM I'm looking at. Thanks for any advice!

CAS 7:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231536

CAS 8:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148656

CAS 9:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148544
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  1. Best answer
    I think you are better to buy the 1600MHz cl9 RAM and use the money to buy better GPU or put into your bank. Read the review the cl9 RAM is better than cl7/cl8.

    http://www.anandtech.com/show/4503/sandy-bridge-memory-scaling-choosing-the-best-ddr3/6
  2. cin19 said:
    I think you are better to buy the 1600MHz cl9 RAM and use the money to buy better GPU or put into your bank. Read the review the cl9 RAM is better than cl7/cl8.

    http://www.anandtech.com/show/4503/sandy-bridge-memory-scaling-choosing-the-best-ddr3/6


    THANK YOU! I was beginning to think that nobody was going to answer my question.
  3. Best answer selected by martinuv.
  4. Between the absolute fastest RAM and the absolute slowest RAM, there is only a 8-10% difference in most real-world workloads. If you put the $40 difference in a better GPU, you can get 30-50% higher frame rates.

    So RAM speed is not really worth worrying about that much unless budget is a non-issue or you have a specific application in mind that absolutely requires it.
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