Now that 4GB limit doesn't leave you a lot of space for system RAM.
You can buy graphics cards fitted with 1GB of RAM, and if you wanted (and had the spare cash!) you could fit three of these into a system.
Here's the math for 32-bit systems: 232 4,294,967,296 bytes 4,294,967,296 / (1,024 x 1,024) 4,096 MB 4GB.
You can see a giant memory hole from 8FEF0000 to ffffffff in this Meminfo output from the system after I installed 64-bit Windows.Dwight says: Vista x64 can use more memory than the 32-bit version, which is limited to 4 gigabytes.And if you think that your system RAM is the only significant factor, think again.On system fitted with 4GB of RAM and a modest graphics card with 512MB of on-board memory the end user normally sees about 3GB of installed system RAM.I hadn't specified the OS version and assumed that they'd put 64-bit Vista on it, but it came with the 32-bit version and as a result only.2GB of the memory was accessible by Windows.Today Dwight Silverman ran a great piece on TechBlog which examines whether folks buying a new PC are best sticking with 32-bit Vista or making the leap to 64-bit Vista.It's a total made up of system RAM, graphics RAM, PCI memory range, acpi and a few other bits and pieces.Windows 7 Professional 32 Bit Memory windows vista home premium 32 bit serials Limit 134.99164.99Microsoft Windows 7 Professional W/SP139.99Quick View Windows 7 Professional Full Version OEM 32/64-bit - Download - FQC-0.10.88Microsoft Windows 7 Home Premium 32-bit Full Version Bundled SataMicrosoft Windows 7 Professional Full Genuine For 1 PC164.99windows 7 professional 32 bit.
Here's a small extract from Mark's blog: The consumption of memory addresses below 4GB can be drastic on high-end gaming systems with large video cards.My only complaint there is that I think that Dwight is being too agnostic when it comes to recommending CPUs, especially at the power user end of the spectrum - the AMD's Phenom really doesn't belong in the same list as Intel's powerhouse CPU, the.There's not a 1 to 1 relationship between graphics memeory consuming system RAM, but the larger the memory, the more the card sets aside for itself.For example, I purchased one from a boutique gaming rig company that came with 4GB of RAM and two 1GB video cards.It's different for 64-bit: 264 18,446,744,073,709,551,616 18,446,744,073,709,551,616 / (1,024 x 1,024) 16EB (exabytes).The 4GB limit refers to total addressable memory space and not just the RAM installed.The problem with this statement is that it gives the impression that the cut off point when it comes to memory lies at the 4GB mark.Less memory than this and you're fine with 32-bit, but any more memory and you need a 64-bit OS to make advantage.Note : Wondering how we arrive at that 4GB limit?For more information, check out an excellent post by tech guru.