Определение частоты процессора

//
// Determinate CPU Freq
//
//

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;

SetPriorityClass(GetCurrentProcess, PriorityClass);

Result := TimerLo / (1000.0 * DelayTime);
end;


// Usage ...

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