Why Does My 64-Bit .NET App Throw an OutOfMemoryException Despite Having 16GB of RAM?

OutOfMemoryException in .NET: Memory Usage Exceeding 1.3GB on 64-Bit Machine

Despite installing 16GB of RAM on a 64-bit computer, an application encounters an OutOfMemory exception after consuming approximately 1.3GB of memory. This issue persists despite the absence of any single object exceeding 2GB in size.

The cause lies in the compilation target architecture. By default, .NET applications are compiled for 32-bit architecture, which imposes a 2GB limit on memory usage per object. Even on a 64-bit machine, compiling for 32-bit limits memory usage to the same extent.

Solution:

To resolve the issue, recompile the application targeting 64-bit architecture. This will allow the application to utilize the full 16GB of RAM available on the system. After recompilation, the binary will run exclusively on 64-bit machines.

Additionally, it's crucial to note that the OutOfMemoryException can also occur if a single collection in the CLR (e.g., List) allocates 2GB of memory on both 32-bit and 64-bit architectures.

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