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What is maximum motherboards ram for 32 bit and 64 bit desktop pc?
There are three types of limits on maximum RAM:
The first limit is the theoretical mathematical limits of 32 bit memory addressing versus 64 bit. To figure this out, its pretty simple. Since computers use binary math (base 2), you just multiply 2 by itself, 32 times, or 2^32, which equals 4 Gigs. For 64 bits, its 2^64, which comes out to 16 Exabytes. To give you an idea of how big an exabyte is.... an exabyte is a thousand petabytes, which is a thousand terabytes, which is a thousand gigabytes. It is roughly one billion Gigabytes. Scientists theorize that all the words ever spoken by all humans past and present takes up around 5 Exabytes (which a 64 bit number can address three times more data). In short, its massive, and you will probably never hit the maximum limit for ram on a 64 bit OS in your lifetime, and probably not in your grandkid's lifetimes. Those limits are based on mathematics only, not computer science. In the real world, the limits are much lower.
The second limit is how much the motherboard can recognize due to its firmware and circuitry. This is a hard-coded number and is specific to each motherboard, and cannot be modified or "upgraded" later on. Generally, it tops out at anywhere to 4 to 16 Gigs for today's consumer grade motherboards.
The third limit is how much RAM your OS can really use. Remember, the first limit I outlined above is only the theoretical mathematical limit. In the real world, there are a lot of other things an OS has to deal with, so the actual limits are much lower than the theoretical limits. In reality, Windows 7 Ultimate 64 Bit can only use 192 Gigs of RAM. Windows 2008 Server 64 Bit tops out at 2 Terabytes of RAM. Windows Vista Ultimate tops out at 128 Gigs of RAM. All 32 bit OS's top out at 4 Gigs, but use some RAM for other functions, like memory addressing for the PCI cards, video RAM, ACPI, etc. The usable RAM for a system with a low-end video card is around 3.3 Gigs. Slap in a couple of high end 1 Gig VRAM video cards, and the usable amount drops dramatically, down near 2 Gigs.
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