I got this problem. 4GB RAM installed, 2.75GB usable with 64-bit Windows 7. I have a PNY GT240 (512MB GDDR5) graphics card installed. My installed BIOS version is 1.08 from May 2007. I know there were a few more updates issued after that one. The 1.14 is the latest update for my machine, according t.
All processes, be it 64-bit or 32-bit, under 64-bit Windows share the same 64-bit system space. Given the fact that the system space is shared across all processes, on 32-bit Windows, processes that create large amount of handles (like threads, semaphores, files, etc.) consume system space by kernel objects and can run out of memory even if you have lot of memory available in total.
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The processor can either be of 32 or 64-Bit but its speed must not drop below 1 GHz. A faster one would be preferable. Now, depending on whether it is 32 or 64 Bit, its RAM requirement would differ. For 32-Bit, 1 GB is the minimum while for 64 GB, you need a 2 GB RAM for optimization.
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In theory this shouldn’t happen, since there isn’t a limitation in 64 bit Operation System to limit the memory to only 4GB. In fact, depending on what version of Windows 7 you are running, a 64 bit system can support up to 192GB of RAM (Windows 7 Home Premium supports 16 GB Max).
If you’re reading this, you are most likely dealing with an issue regarding a 64-bit Windows machine (such as Windows 2008 Server, Windows 2012 Server, Windows 7, Windows 10 and so on) and a rather old, 32-bit (x86) executable file with some memory issues.
The 32-bit version of Windows 7 Professional version supports up to 4 GB RAM, while the 64-bit version supports 192 GB RAM, as well as supports up to two physical processors in the system. N, KN versions, and VL build ISO files are available in the download menu.