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    Is it ok to mix different brands of ram?

    I currently have 2 x 2gb of corsair ram in my pc and now have 2 x 2g of crucial ram to put in it

    Is it ok to mix different types of ram?

    16 Comments

    Assuming it's the same type, e.g. DDR2, DDR3 then it should work. It won't do any harm if it doesn't anyway.

    Original Poster

    flyingflea

    Assuming it's the same type, e.g. DDR2, DDR3 then it should work. It … Assuming it's the same type, e.g. DDR2, DDR3 then it should work. It won't do any harm if it doesn't anyway.



    yeah it's the same typre ddr3 1333mhz, i'll try it then, thanks

    as long as the SPD (serial presence detect) profile is the same and voltage they use*. It can cause system instabilities. You might be lucky. You might also have to set timings manually (spd should lower both to lowest value) but pick the lowest frequency v voltage both sets are happy with bios will play a part in your succes / chances as well

    *Timings/ v voltage / high density / ecc /

    To find out properly you would have to install windows a fresh to see any anomalies quickly unfold like 7zip extracting / crashing / Norton av/ av / malware installation issues / windows memory reporting features etc.

    Edited by: "dontasciime" 29th Nov 2010

    Original Poster

    If I installed them and then ram them through memtest would that show any problems?

    souljacker

    If I installed them and then ram them through memtest would that show any … If I installed them and then ram them through memtest would that show any problems?



    Would be wise to do that. I was also going to post that , was just about to edit to tell you to just try your 4 mem sticks together and see what it runs like then test with memtest+ overnight

    check part numbers on both brands of memory though for voltage unless you got auto voltage set to enable in bios(providing it's not buggy) . I think you'll be ok but better to be safe than sorry
    Edited by: "dontasciime" 29th Nov 2010

    dontasciime

    as long as the SPD (serial presence detect) profile is the same and … as long as the SPD (serial presence detect) profile is the same and voltage they use*. It can cause system instabilities. You might be lucky. You might also have to set timings manually (spd should lower both to lowest value) but pick the lowest frequency v voltage both sets are happy with bios will play a part in your succes / chances as well*Timings/ v voltage / high density / ecc / To find out properly you would have to install windows a fresh to see any anomalies quickly unfold like 7zip extracting / crashing / Norton av/ av / malware installation issues / windows memory reporting features etc.



    Easier and more thorough to use a Memtest CD (if its not already installed on the motherboard, you can download it and burn it to CD/memory stick, or its also on most modern Linux boot discs).

    Edit - started writing before the two posts above!
    Edited by: "jah128" 29th Nov 2010

    Original Poster

    Thanks for the help, I'll put them in and then run it through memtest for a few hours

    Original Poster

    well i put it in the pc and it wouldn't even boot with it in, couldn't even run memtest, anything i can do or is it just not compatible?

    you try it with just the crucial ram by itself ?

    Original Poster

    dontasciime

    you try it with just the crucial ram by itself ?



    no i didn't actually, i turned the pc on with just the corsair in and it had problems, which i've now sorted so i'm just going to leave it as it is and sell the crucial on, maybe get some corsair in the future

    I've finally got the pc running great so don't want to mess it up again

    The motherboard might not support 4GB. Have you tried updating the BIOS?

    Original Poster

    It's already got 4gb in it and the motherboard supports 8gb

    How do I alter the speed to run at the speed of the slowest stick?

    souljacker

    It's already got 4gb in it and the motherboard supports 8gbHow do I alter … It's already got 4gb in it and the motherboard supports 8gbHow do I alter the speed to run at the speed of the slowest stick?



    It'll automaticly down clock but you may be able can change other things like voltage via the BIOS.

    I agree that voltage settings may be an issue. If the RAM's default voltage is higher than what is rated by the BIOS you may experience issues. It could also be that the motherboard does not match JEDEC specifications - ie. JEDEC specify that DDR2 RAM should run at 1.9V whereas the motherboard has been set to provide 1.8V. You may be able to set this within the BIOS but you should be absolutely confident of the settings before making the changes.

    Another potential issue is the arrangement of each chip on the RAM as low density have an 8 bit data width and high density have a 4 bit data width. High density memory RAM are incompatible with some boards (even though Crucial's scanner guarantees compatibility but it is occasionally wrong).
    Edited by: "ElliottC" 1st Dec 2010

    Original Poster

    ElliottC

    I agree that voltage settings may be an issue. If the RAM's default … I agree that voltage settings may be an issue. If the RAM's default voltage is higher than what is rated by the BIOS you may experience issues. It could also be that the motherboard does not match JEDEC specifications - ie. JEDEC specify that DDR2 RAM should run at 1.9V whereas the motherboard has been set to provide 1.8V. You may be able to set this within the BIOS but you should be absolutely confident of the settings before making the changes.Another potential issue is the arrangement of each chip on the RAM as low density have an 8 bit data width and high density have a 4 bit data width. High density memory RAM are incompatible with some boards (even though Crucial's scanner guarantees compatibility but it is occasionally wrong).



    thanks but you've lost me with most of that, i've already altered the voltage on the corsair ram as i was having issues and someone over on the windows 7 forum gave me some good advice but i really don't want to start messing about with voltages myyself, as i don't know where to start

    thanks anyway

    souljacker

    thanks but you've lost me with most of that, i've already altered the … thanks but you've lost me with most of that, i've already altered the voltage on the corsair ram as i was having issues and someone over on the windows 7 forum gave me some good advice but i really don't want to start messing about with voltages myyself, as i don't know where to startthanks anyway



    OK, I'll try to reword it as I did type it all pretty quick.

    The person in the Windows 7 Forum gave you very good advice. The voltages can vary between different sticks of memory (even of the same brand). You may find some that are rated at 1.9V (which may well be within specifications as determined by JEDEC). Specifications are important because they need to be met to guarantee compatibility and interconnectivity.

    Your motherboard may not adhere to specifications and may only run RAM at a maximum of 1.8V but the RAM is rated higher. Some people will blame the RAM but I blame the board because the RAM has not broken any of the rulesdetermined by JEDEC specifications. However, it is rare for the board not to meet the necessary standards and it should be possible to set the voltage to 1.9V within the BIOS.

    If you set the voltage to 1.9V to match 1.9V memory, we have a problem whereby if you mix this with 1.8V memory, you would be effectively overclocking the 1.8V memory and this could cause instabilities. So when matching memory,not only do you need to ensure the latency, access times, etc, you will need to match on voltage and the memory density.
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