// The Windows form is simple, having only one button titled 
// "Click to get CPU speed" and a label to show the results
// written for Delphi 3.0      (vegaseat)

unit CPUspeedz;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;


implementation

{$R *.DFM}

// get the speed of your CPU in MHz
function GetCPUSpeed: Double; 
const 
  DelayTime = 500; 
var 
  TimerHi, TimerLo: DWORD; 
  PriorityClass, Priority: Integer; 
begin
  PriorityClass := GetPriorityClass(GetCurrentProcess); 
  Priority      := GetThreadPriority(GetCurrentThread); 

  SetPriorityClass(GetCurrentProcess, REALTIME_PRIORITY_CLASS); 
  SetThreadPriority(GetCurrentThread, THREAD_PRIORITY_TIME_CRITICAL); 

  Sleep(10); 
  asm 
    dw 310Fh 
    mov TimerLo, eax 
    mov TimerHi, edx 
  end; 
  Sleep(DelayTime); 
  asm 
    dw 310Fh 
    sub eax, TimerLo 
    sbb edx, TimerHi 
    mov TimerLo, eax 
    mov TimerHi, edx 
  end; 

  SetThreadPriority(GetCurrentThread, Priority); 
  SetPriorityClass(GetCurrentProcess, PriorityClass); 

  Result := TimerLo / (1000 * DelayTime); 
end; 


procedure TForm1.Button1Click(Sender: TObject);
begin
  Label1.Caption := (Format('Your CPU speed: %f MHz', [GetCPUSpeed]));
end;

end.