Get Cpu Speed With Dephi And Assembler real CPU in MHz

[DeveloperX 0]

3 different functions to getting real CPU speed.

First.

function GetCPUSpeed: real;   function IsCPUID_Available: Boolean; assembler; register;   asm 			PUSHFD							POP	EAX			{ Flags to EAX } 			MOV	EDX,EAX		{ store current flags }			XOR	EAX,$200000	{ w/o ID bit }			PUSH	EAX		   { to EAX } 			POPFD				{ to flags } 			PUSHFD				{ return }			POP	EAX			{ return to EAX } 			XOR	EAX,EDX		{ check ID }			JZ	  @exit		 { no, CPUID not accessable }			MOV	AL,True		{ Result=True } 			@exit:   end;   function hasTSC: Boolean;   var 	Features: Longword;   begin 	asm 			  MOV	Features,0	{ Features = 0 } 			  PUSH	EBX 			  XOR	EAX,EAX 			  DW	  $A20F 			  POP	EBX 			  CMP	EAX,$01 			  JL	  @Fail 			  XOR	EAX,EAX 			  MOV	EAX,$01 			  PUSH	EBX 			  DW	  $A20F 			  MOV	Features,EDX 			  POP	EBX 			  @Fail: 	end; 	hasTSC := (Features and $10) <> 0;   end; const   DELAY = 500; var   TimerHi, TimerLo: Integer;   PriorityClass, Priority: Integer; begin   Result := 0;   if not (IsCPUID_Available and hasTSC) then Exit;   PriorityClass := GetPriorityClass(GetCurrentProcess);   Priority := GetThreadPriority(GetCurrentThread);   SetPriorityClass(GetCurrentProcess, REALTIME_PRIORITY_CLASS);   SetThreadPriority(GetCurrentThread, 	THREAD_PRIORITY_TIME_CRITICAL);   SleepEx(10, FALSE);   asm 			DB	  $0F		   { $0F31 op-code for RDTSC Pentium } 			DB	  $31		   { returns 64-bit Integer } 			MOV	TimerLo,EAX 			MOV	TimerHi,EDX   end;   SleepEx(DELAY, FALSE);   asm 			DB	  $0F		   { $0F31 op-code для RDTSC Pentium } 			DB	  $31		   {  returns 64-bit Integer } 			SUB	EAX,TimerLo 			SBB	EDX,TimerHi 			MOV	TimerLo,EAX 			MOV	TimerHi,EDX   end;   SetThreadPriority(GetCurrentThread, Priority);   SetPriorityClass(GetCurrentProcess, PriorityClass);   Result := TimerLo / (1000 * DELAY); end;

Second. Returns speed in MHz.

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

Third (WinApi).

function RdTSC : int64; register; asm   db   $0f, $31 end;												  function GetCyclesPerSecond : int64; var   hF, T, et, sc : int64; begin   QueryPerformanceFrequency(hF);						  // HiTicks / second   QueryPerformanceCounter(T);						// Determine start HiTicks   et := T + hF;		   // (Cycles are passing, but we can still USE them!)   sc := RdTSC;														  // Get start cycles   repeat									// Use Hi Perf Timer to loop for 1 second 	QueryPerformanceCounter(T);							// Check ticks NOW   until (T >= et);					//  Break the moment we equal or exceed et   Result := RdTSC - sc;				// Get stop cycles and calculate result end;

Choose yours...