rahul.6sept
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It is the number of address lines on the processor that fix the amount of memory that can be addressed, not the OS.
An Intel i7 has 36 address lines allowing 64GB to be addressed.
2^64 is a lot of memory. If the processor had 64 address lines, clocking at 1GHz, it would take 584 years to read all the memory.
For example if you install 2 high end video cards, each with 1GB of onboard video RAM then 32 bit Windows will only see ~2GB of RAM for running programs.
With a 32 bit OS it depends on what other hardware you install.
For example if you install 2 high end video cards, each with 1GB of onboard video RAM then 32 bit Windows will only see ~2GB of RAM for running programs.
For most CPU's there's a direct link between memory space it can access, and the width (# of bits) of internal registers. That's because CPU registers often refer to memory locations, so when you have 2^32 of those, it's convenient to have 32-bit wide registers in the CPU.What does the '64' represents in '64 bit OS'
With a 32 bit OS it depends on what other hardware you install.
For example if you install 2 high end video cards, each with 1GB of onboard video RAM then 32 bit Windows will only see ~2GB of RAM for running programs.
I don't know whether video cards can be installed on laptops.
Many laptops come installed with external video cards, mainly for better graphics performance.
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