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Created attachment 1395 [details]
DxDiag of my computer.

I tried using the new SDL_GetSystemRAM() function, but it always returns 0 on my machine, described by the DxDiag file attached.

However, I have determined the cause.

In SDL_cpuinfo.c:

            MEMORYSTATUSEX stat;
            if (GlobalMemoryStatusEx(&stat)) {
                SDL_SystemRAM = (int)(stat.ullTotalPhys / (1024 * 1024));
            }

Should actually be:
            MEMORYSTATUSEX stat;
            stat.dwLength = sizeof(stat);
            if (GlobalMemoryStatusEx(&stat)) {
                SDL_SystemRAM = (int)(stat.ullTotalPhys / (1024 * 1024));
            }

Notice the subtle difference is that we must initialize "dwLength" with the size of the struct. This is documented here: http://msdn.microsoft.com/en-us/library/windows/desktop/aa366770%28v=vs.85%29.aspx

----
dwLength
The size of the structure, in bytes. You must set this member before calling GlobalMemoryStatusEx.
----