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Upgrading my memory

Hi guys, I have some simple question I wanna ask before buying anything.

Right now, my PC has 6 (3x2) gb of RAM with a CAS Latency of 7 with 7-7-7-18 timing and a speed of 1333 mhz

here's the link : http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231230

I'd like to upgrade to 12 gb by buying 8 gb (2x4) of RAM of CAS Latency 7 with 7-7-7-21 timing and a speed of 1066 mhz.

here's the link : http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231308

I would replace one stick of to gb by one stick of 8 gb and put the other 8 gb in the remaining slot.

My questions are :

What is the difference between a timing of 7-7-7-18 and 7-7-7-21 ?

Is the speed an important thing to consider ? Is 1333 over 1066 is worth the extra 30$ ?

Also, if two sticks are slower will they limit or will they be compatible with the faster ones ??


Finally, do you think it's a good idea to do this or should I buy memory with the same speed and timing ? Will it bother at all ??
7 answers Last reply Best Answer
More about upgrading memory
  1. Neither the timings nor the frequency of DDR3 RAM makes a whole lot of difference in system performance. You do NOT want to buy 8 GB. to add to your system. RAM is so cheap right now you should buy a Matched, Tested 12 GB. Kit as mixing of RAM is never recommended and unlikely to work without issues.
  2. Best answer
    You don't want to mix ram just like beenthere said if you can help it.

    If you want more ram than 6 gb than get two of these and sell your current ram for like 20-30(maybe more) bucks then you can get 16 gb of ram. IMO unless your doing photo editing/3D editing things than I wouldn't recommend more than one 8 gb set. $39.99 for 8 gb of DDR3 1333 RAM is good value.

    Here's a good deal but it ends today so jump on it. It's 2x4gb set you can get two of them for $79.98(with $10 worth of promotional codes) with free shipping :)

    http://www.newegg.com/Product/Product.aspx?Item=N82E16820231311
  3. I'm in Canada so I don't have the 5$ rebate.

    If I buy this model :

    http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231308

    Model F3-8500CL7D-8GBRL
    Capacity 8GB (2 x 4GB)
    Speed DDR3 1066 (PC3 8500)
    Cas Latency 7
    Timing 7-7-7-18
    Voltage 1.5V


    Will it fit with my current memory which is :

    http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231230

    Model F3-10666CL7T-6GBPK
    Capacity 6GB (3 x 2GB)
    Speed DDR3 1333 (PC3 10666)
    Cas Latency 7
    Timing 7-7-7-18
    Voltage 1.5V – 1.6V




    They have the same timing... or should I get this one :

    http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231402

    Model F3-10666CL7D-8GBRH
    Capacity 8GB (2 x 4GB)
    Speed DDR3 1333 (PC3 10666)
    Cas Latency 7
    Timing 7-7-7-21
    Voltage 1.5V


    It has the same model number and same speed.....but different timing. I'm a little bit lost honestly between all this.
  4. Ooh and by the way, my mobo is an ASUS M4A89GTD Pro/USB3 which work only in dual-channel operation. Am I doing something wrong here by buying three sticks of memory or should I get four stick ? Or maybe keep 2 of my 2gb stick then add 2 x 4gb stick in the remaining slot ?
  5. With dual channel mobos use two or four memory DIMMs for dual channel performance other wise your system will be slower if you use 1 or 3 DIMMs.
  6. If your motherboard only works in dual channel mode then you need a fourth stick identical to the third.

    Preferably from the same kit because there is no guarantee it will work otherwise.
  7. Best answer selected by Furieux.
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