.NET Out Of Memory Exception – Used 1.3GB but have 16GB installed

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There is no difference until you compile to same target architecture. I suppose you are compiling for 32 bit architecture in both cases.

It’s worth mentioning that OutOfMemoryException can also be raised if you get 2GB of memory allocated by a single collection in CLR (say List<T>) on both architectures 32 and 64 bit.

To be able to benefit from memory goodness on 64 bit architecture, you have to compile your code targeting 64 bit architecture. After that, naturally, your binary will run only on 64 bit, but will benefit from possibility having more space available in RAM.

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