C# Signature:

    [DllImport("coredll", SetLastError = true)]
    public static extern void GetSystemInfo(out SYSTEM_INFO lpSystemInfo);

VB Signature:

    Declare Function GetSystemInfo Lib "coredll.dll" (ByVal lpSystemInfo AS SYSTEM_INFO)

VB Support Enumerations:

    Public Enum ProcessorArchitecture As Int16
        PROCESSOR_ARCHITECTURE_INTEL = 0
        PROCESSOR_ARCHITECTURE_MIPS = 1
        PROCESSOR_ARCHITECTURE_ALPHA = 2
        PROCESSOR_ARCHITECTURE_PPC = 3
        PROCESSOR_ARCHITECTURE_SHX = 4
        PROCESSOR_ARCHITECTURE_ARM = 5
        PROCESSOR_ARCHITECTURE_IA64 = 6
        PROCESSOR_ARCHITECTURE_ALPHA64 = 7
        PROCESSOR_ARCHITECTURE_UNKNOWN = &hFFFF;
    End Enum

SYSTEM_INFO on MSDN

[StructLayout(LayoutKind.Sequential)]
public struct SYSTEM_INFO
{
     //[MarshalAs(UnmanagedType.U4)]
     //public int dwOemId;   // dwOemId is obsolete according to MS: http://msdn.microsoft.com/en-us/library/aa450921.aspx
     [MarshalAs(UnmanagedType.U2)]
     public ProcessorArchitecture wProcessorArchitecture;
     [MarshalAs(UnmanagedType.U2)]
     public short wReserved;
     [MarshalAs(UnmanagedType.U4)]
     public int dwPageSize;
     public uint lpMinimumApplicationAddress;
     public uint lpMaximumApplicationAddress;
     [MarshalAs(UnmanagedType.U4)]
     public int dwActiveProcessorMask;
     [MarshalAs(UnmanagedType.U4)]
     public int dwNumberOfProcessors;
     [MarshalAs(UnmanagedType.U4)]
     public int dwProcessorType;
     [MarshalAs(UnmanagedType.U4)]
     public int dwAllocationGranularity;
     [MarshalAs(UnmanagedType.U2)]
     public short dwProcessorLevel;
     [MarshalAs(UnmanagedType.U2)]
     public short dwProcessorRevision;
}

Alternative Managed API:

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Notes:

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Sample Code:

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace Test
{
    [StructLayout(LayoutKind.Sequential)]
    public struct SYSTEM_INFO
    {
        [MarshalAs(UnmanagedType.U4)]
        public int dwOemId;
        [MarshalAs(UnmanagedType.U4)]
        public int dwPageSize;
        public uint lpMinimumApplicationAddress;
        public uint lpMaximumApplicationAddress;
        [MarshalAs(UnmanagedType.U4)]
        public int dwActiveProcessorMask;
        [MarshalAs(UnmanagedType.U4)]
        public int dwNumberOfProcessors;
        [MarshalAs(UnmanagedType.U4)]
        public int dwProcessorType;
        [MarshalAs(UnmanagedType.U4)]
        public int dwAllocationGranularity;
        [MarshalAs(UnmanagedType.U2)]
        public short dwProcessorLevel;
        [MarshalAs(UnmanagedType.U2)]
        public short dwProcessorRevision;
    }
    class Program
    {
       [DllImport("coredll", SetLastError = true)]
       public static extern void GetSystemInfo(out SYSTEM_INFO pSi);
       static void Main(string[] args)
       {
           SYSTEM_INFO si;
           GetSystemInfo(out si);
       }
    }
}

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