Как найти скорость процессора?

Code:

function GetCPUSpeed: Double;

const DelayTime = 500;

var TimerHi : DWORD;

    TimerLo : DWORD;

    PriorityClass : Integer;

    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 // 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);

end;

// Usage ...

LabelCPUSpeed.Caption := Format('CPU speed: %f MHz', [GetCPUSpeed]);