King Computer Solutions
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02.27.2009

How much RAM can I access with a 32-bit or 64-bit operating system?

How much RAM can I access with a 32-bit or 64-bit operating system?

Whether you use a 32-bit or 64-bit operating system depends on the amount of memory you require in the system. 64 bit operating systems, except for their access to more memory, do not provide improved performance, and sometimes there a problems finding 64 bit drivers.

Extra RAM also doesn’t help improve performance unless its needed i.e. you are running multiple memory intensive applications that are currenlty using up the physcial RAM. Once the system goes into using Virtual memory (hard disk) for storing the excess, it’s a 1000 times slower.-

  • greg

    Hi, I was hoping you could clarify something for me… I haven’t been able to find a definitive answer on this anywhere online.

    We have Win2003 Server R2 Std x64 Edition SP2, which is running a 64-bit version of SQL 2005. The server has 8GB now. And I can’t tell for sure if it could directly address more memory. Do you know the answer? Does it depend on the type and/or number of processors? It’s an Intel Xeon X5355 @ 2.66GHz.

    This link…
    http://technet.microsoft.com/en-us/windowsserver/bb405950.aspx
    …says it “supports up to 32 GB of RAM on 1- to 4-way servers”, but I don’t know what X-way servers is referring to.

    This link (same as you provided)…
    http://msdn.microsoft.com/en-us/library/aa366778.aspx
    …just says “32GB” and doesn’t mention anything else.

    Thanks for any help you can provide!

    Greg

  • http://www.kingcomputer.com.au Brendan King

    You can access up to 32Gb on your server. The Intel Xeon X5355 can access up to one terabyte (TB) of platform address space, but windows has the 32Gb limitation which makes this irrelevant.

  • http://twitter.com/MyVideosToWatch Billy Tail

    Thank you for this information. Some brag about 61or 32Gb RAM, but on a 32bit system I have to snigger