Windows detects 2.75GB or no more than 4GB of memory.
Question
Windows detects 2.75GB or no more than 4GB of memory.
Answer
Often after installing more than 2GB, users will notice not all of the memory being detected. The total memory capable of being detected by any 32-bit edition of Microsoft Windows is 4GB. This means that many systems with video cards using 256MB, 512MB, or more, may not detect much more than 2GB. This is normal behavior of all 32-bit versions of Windows.
Users who are wanting more than 4GB of total memory support in their computer, must be running a computer with 64-bit processor and operating system. Below is a listing of 64-bit memory limitations.
| 64-bit OS | Total memory |
| Windows 7 Ultimate/Enterprise/Professional | 192GB |
| Windows 7 Home Premium | 19GB |
| Windows 7 Home Basic | 8GB |
| Windows 7 Starter | 2GB |
| Windows Vista Ultimate/Enterprise/business | 128GB |
| Windows Vista Home Premium | 16GB |
| Windows Vista Home Basic | 8GB |
| Windows XP 64-bit | 128GB |
Why does BIOS detect more memory than Windows?
Some users may notice when they enter the BIOS/CMOS setup that their computer is detecting more memory in it than in Windows. This is because the BIOS relies on different drivers than those loaded by Windows. This too is normal and how computers work, even if your BIOS is detecting more memory than Windows.