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copied!<p>The array limit is, afaik, fixed as int32 even on 64-bit. There is a cap on the maximum size of a single object. However, you could have a nice big jagged array quite easily.</p> <p>Worse; because references are larger in x64, for ref-type arrays you actually get <em>less</em> elements in a single array.</p> <p>See <a href="http://www.twine.com/item/11qtqln9x-1s/josh-williams" rel="nofollow noreferrer">here</a>:</p> <blockquote> <p>I’ve received a number of queries as to why the 64-bit version of the 2.0 .Net runtime still has array maximum sizes limited to 2GB. Given that it seems to be a hot topic of late I figured a little background and a discussion of the options to get around this limitation was in order.</p> <p>First some background; in the 2.0 version of the .Net runtime (CLR) we made a conscious design decision to keep the maximum object size allowed in the GC Heap at 2GB, even on the 64-bit version of the runtime. This is the same as the current 1.1 implementation of the 32-bit CLR, however you would be hard pressed to actually manage to allocate a 2GB object on the 32-bit CLR because the virtual address space is simply too fragmented to realistically find a 2GB hole. Generally people aren’t particularly concerned with creating types that would be >2GB when instantiated (or anywhere close), however since arrays are just a special kind of managed type which are created within the managed heap they also suffer from this limitation.</p> </blockquote> <hr> <p>It should be noted that in .NET 4.5 the <em>memory size</em> limit is optionally removed by the <a href="http://msdn.microsoft.com/en-us/library/hh285054(v=vs.110).aspx" rel="nofollow noreferrer">gcAllowVeryLargeObjects</a> flag, however, this doesn't change the maximum <em>dimension</em> size. The key point is that if you have arrays of a custom type, or multi-dimension arrays, then you can now go beyond 2GB in memory size.</p>

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