Ram upgrade - Can you mix pc5300 with pc6400?

By korrupt
Oct 20, 2009
  1. Hi Guys,

    Currently have 2 x 1GB Corsair pc5300 but wanting to upgrade to 4gb as I am doing a lot of CAD rendering... Firstly, will the extra ram make a big difference? Specs are below.

    PU:Intel Core 2 Duo Conroe E6300
    Motherboard:Intel P965LTCK
    Graphics Card
    : Gigabyte 7600GT Silent Pipe II
    RAM: 2 x 1GB Corsair pc5300
    Case: Antec Sonata II
    PSU: Antec Smartpower 450Watt
    HDD: Western Digital Caviar 250GB Sata
    Dvd Burner: LG 16x Super Multi
    Dvd reader/cd writer: Lg CD/DVD Rom Drive
    Floppy: Panasonic Floppy Drive
    Operating System: Windows XP Professional 32Bit
    Monitor: 2 x Samsung Syncmaster 940N
    Keyboard/mouse: Standard Microsoft Keyboard and Mouse

    I saw a good deal on RAM but its pc6400 (details below) Will this go ok with PC5300? Or do i need to get pc5300 to match?

    Corsair TWIN2X2048-6400 2GB (2x XMS2 1GB) PC-6400 (800MHz) DDR2 RAM, 2x240-pin DIMMs, Non ECC Unbuffered, 5-5-5-18


  2. Ritwik7

    Ritwik7 TechSpot Chancellor Posts: 1,672   +9

    Theoretically it should work, although at the lower of the 2 speeds.

    What are the RAM timings of your previous modules? It's never really recommended to mix modules but since you're sticking to the same manufacturer (and hopefully the same timings), it should be OK.
  3. korrupt

    korrupt TS Rookie Topic Starter Posts: 716

    I'm not sure how I would find out the timings of the original RAM...

    Also, do you think the extra 2gb would make a noticeable difference?

    Thanks for your reply!

  4. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,224   +164

    Hi korrupt,
    a vast majority of the time that that mix will work. keep in mind that with a 32 bit OS, the system will only let you have between 2.75gb and 3.25gb of working memory, the rest is taken up and re-routed by memory mapping reservations. When running a program like CAD the more RAM the better even if you will not be able to realize the full 4gb as 'working memory' . as far as finding the timings of your existing memory, you can use this program to see them. http://www.cpuid.com/cpuz.php
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