Determine the processor speed in MHz

Here is a handy routine which will return an estimated core processor speed (CPU speed) of your PC. Read the comment to see how to use it.

function GetCpuSpeed: Comp;
{ function to return the CPU clock speed only. }
{ Usage: MessageDlg(Format('%.1f MHz', [GetCpuSpeed]), mtConfirmation, [mbOk], 0); }
var
t: DWORD;
mhi, mlo, nhi, nlo: DWORD;
t0, t1, chi, clo, shr32: Comp;
begin
shr32 := 65536;
shr32 := shr32 * 65536;
t := GetTickCount;
while t = GetTickCount do
begin
end;
asm
DB 0FH
DB 031H
mov mhi,edx
mov mlo,eax
end;
while GetTickCount < (t + 1000) do
begin
end;
asm
DB 0FH
DB 031H
mov nhi,edx
mov nlo,eax
end;
chi := mhi;
if mhi < 0 then
chi := chi + shr32;
clo := mlo;
if mlo < 0 then
clo := clo + shr32;
t0 := chi * shr32 + clo;
chi := nhi;
if nhi < 0 then
chi := chi + shr32;
clo := nlo;
if nlo < 0 then
clo := clo + shr32;
t1 := chi * shr32 + clo;
Result := (t1 - t0) / 1E6;
end;

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