Recuperar a Velocidade da CPU

Esta interessante função recupera a velocidade de processamento aproximada da CPU:

const
ID_BIT=$200000; // EFLAGS ID bit
 
function GetCPUSpeed: Double;
const
DelayTime = 500;
var
TimerHi, TimerLo: DWORD;
PriorityClass, Priority: Integer;
begin
try
PriorityClass := GetPriorityClass(GetCurrentProcess);
Priority := GetThreadPriority(GetCurrentThread);
 
SetPriorityClass(GetCurrentProcess, REALTIME_PRIORITY_CLASS);
SetThreadPriority(GetCurrentThread,THREAD_PRIORITY_TIME_CRITICAL);
 
Sleep(10);
asm
dw 310Fh // rdtsc
mov TimerLo, eax
mov TimerHi, edx
end;
Sleep(DelayTime);
asm
dw 310Fh // rdtsc
sub eax, TimerLo
sbb edx, TimerHi
mov TimerLo, eax
mov TimerHi, edx
end;
 
SetThreadPriority(GetCurrentThread, Priority);
SetPriorityClass(GetCurrentProcess, PriorityClass);
 
Result := TimerLo / (1000.0 * DelayTime);
except end;
end;
No evento OnClick, basta atribuir a saída da função a uma string:

procedure TForm1.Button1Click(Sender: TObject);
var cpuspeed:string;
begin
cpuspeed:=Format('%f MHz', [GetCPUSpeed]);
edit1.text := cpuspeed;
end;