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Vista/Windows install question

This may seem like a dumb question but I have never known the answer. I am about to do a clean intall with vista on a comp that has XP. During intallation how does deleting the partition wipe out the previous windows so fast? Usually uninstalling anything takes at least a couple minutes. Or maybe I am doing something wrong :(
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  1. Another question just came to mind. I am installing the 32-bit version. If I put in 4g or ram is it actually going to utilize it or is 3.5 the max? I know that 4g won't register but will it at least use all of it?
  2. Best answer
    In 32 bit Windows operating systems, the total addressable space available is 4GB. If you install a total of 4GB worth of RAM, the system will detect/use/display less than 4GB of total memory because of address space allocation for other critical functions, such as:

    - System BIOS (including motherboard, add-on cards, etc..)
    - Motherboards resources
    - Memory mapped I/O
    - Configuration for AGP/PCI-Ex/PCI
    - Other memory allocations for PCI devices

    Different onboard devices and different add-on cards (devices) will result of different total memory size. e.g. more PCI cards installed will require more memory resources, resulting of less memory free for other uses.

    This limitation applies to most chipsets & Windows XP/Vista 32-bit version operating systems. Again, this is a limitation of the Operating System not having enough address space to allocate to the system *and* the RAM. Not allocating address space to devices renders them inoperable. Not allocating addresses to RAM simply results in the unaddressed section not being used in an otherwise fully functional computer. Therefore the OS designers assign RAM last.

    We can have long debates about mathematical fundamentals and discussions about why the original Windows designers couldn't allocate the full theoretical max of 36 bits of address space so that users today would be able to use more resource. But at the end of the day, the designers and engineers 'Didn't Then'. So we 'Can't Now'.

    If you install a Windows operating system, and if more than 3GB memory is required for your system, then the below conditions must be met:

    1. A memory controller which supports memory swap functionality is used. The latest chipsets like Intel 975X, 955X, Nvidia NF4 SLI Intel Edition, Nvidia NF4 SLI X16, AMD K8 and newer architectures can support the memory swap function.

    2. Installation of Windows XP Pro X64 Ed. (64-bit), Windows Vista 64, or other OS which can provide more than 4GB worth of address space.

    Note: According to the latest Change Log published by Microsoft, Windows Vista 32bit SP1 will display the installed amount of RAM. This is a display change only.
  3. Wow, lots of info. Thanks a lot for the help :) I only have 2g but was thinking of going up to 4g. Think I'll just stay at 2g.
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