Can 667mhz DDR2 RAM be combined with 533mhz DDR2 RAM?

Elanchezhiyan June 18, 2013

I have two DDR2 RAM slots. In one I have installed 512MB 533Mhz RAM. I have bought 1GB 667Mhz DDR2 RAM.
Can I insert and use both types of RAM at the same time?

  1. Ishan Lankage
    June 18, 2013 at 4:32 pm

    dvdrw was mised what i do now

    • Alan Wade
      June 18, 2013 at 5:41 pm

      I dont understand what you are saying. If you are trying to ask a question then please start your own thread.

    • Oron Joffe
      June 19, 2013 at 7:37 am

      Do you mean you don't have the manual? Simply google " support", where is the full make and model of your laptop, e.g. ASUS P8H77-M. One of the top links will take you to the motherboard company's web site, where you can look for manual in the downloads section. Most manufacturers have a separate section for software (drivers, applications, BIOS), and documentation (manuals), but some list them all together. At any rate, you should be able to find the manual there.

  2. Oron Joffe
    June 18, 2013 at 1:10 pm

    You can use 667MHz RAM instead of 522MHz, but as for combining, this depends on the motherboard. Some motherboards will only support "matched pairs" of modules (where both momdules are identical in every respect, not just speed), though most motherboards will allow you to combine unmateched modules. In other words, read the user guide!

  3. DalSan M
    June 18, 2013 at 7:15 am

    Tim and Junil are correct. The 667MHz RAM is backwards compatible to 533MHz, which is what it will clock down to. The speed difference in this instance won't matter much because of the much needed upgrade to a larger amount of memory. If you already had 1 or more GB of RAM instead, then I would have suggested getting matching higher speed RAM for faster performance. If your motherboard supports dual channel mode, that would give even better performance, but the memory size and speed has to match.

  4. Alan Wade
    June 18, 2013 at 6:39 am

    Check your motherboard user manual, it will or should tell you what types of RAM is compatible with the M/B and then as others have said you can mix them but will only get the slowest speed.

  5. ha14
    June 18, 2013 at 5:34 am

    depends on BIOS and motherboard check the manufacturer

  6. Junil Maharjan
    June 18, 2013 at 4:25 am

    they can be used together but the system will only work with the 553 MHz clock speed.

  7. Jim Chambers
    June 18, 2013 at 2:38 am

    You can if your motherboard supports 667MHz RAM. If it does't recognize the new RAM, it maybe just a matter of updating the BIOS.

  8. Tim Brookes
    June 18, 2013 at 1:43 am

    Yes, you can use both sticks of RAM at the same time. Note, however that the RAM will operate at the slowest of the two speeds, as available memory is only as fast as the weakest component. So, you will end up with two sticks of memory totalling 1.5GB RAM, each running at the slower clockspeed of 533Mhz.

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