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#11
In most cases, yes. In the case of your laptop, from what I can find about its specs,
UKT Support - Advent Roma 3001 Laptop
it only supports up to 4 GB of ram. That in and of itself isn't the problem as far as 64 bit and 4 GB of ram. The problem comes up if the 4 GB max is a chipset limit as well, which when that occurs causes this to happen,
The system memory that is reported in the System Information dialog box in Windows Vista is less than you expect if 4 GB of RAM is installed
Unless there is an option in the bios for memory remapping (required to push the virtual addressing space above the 4 GB limit), even with 64 bit Windows you will still see similar for available memory.Note When the physical RAM that is installed on a computer equals the address space that is supported by the chipset, the total system memory that is available to the operating system is always less than the physical RAM that is installed. For example, consider a computer that has an Intel 975X chipset that supports 8 GB of address space. If you install 8 GB of RAM, the system memory that is available to the operating system will be reduced by the PCI configuration requirements. In this scenario, PCI configuration requirements reduce the memory that is available to the operating system by an amount that is between approximately 200 MB and approximately 1 GB. The reduction depends on the configuration.