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How do I get CPU Clock Speed

Posted on 1997-05-16
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Last Modified: 2010-04-04
How do I get CPU Clock Speed (200 MHz, 166 MHz, etc.) within
my Delphi 2.0 program.  I have tried about 10 different "System Info" components and none return this information.
I cannot find it in the registry either.  I really need a way to get this on all Windows platforms, but definitely in Win95 and WinNT.  I'm brand new to Delphi, so this is probably easy for some of you.  Please help a new guy.  Thanks in advance for your time.
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Question by:Rik
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sperling earned 50 total points
ID: 1336359
Didn't I answer this on news???

Anyway, this works for Win95 and NT if the hardware supports it.


function CPUFrequency : SINGLE;
var
  li     : TLargeInteger;
begin
  QueryPerformanceFrequency(li);
  Result := li.QuadPart / 10000;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Label1.Caption := FloatToStrF(CPUFrequency, ffFixed, 6, 2);
end;


Don't know how you can get this for Win 3.1 though.

Regards,

Erik.
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Author Comment

by:Rik
ID: 1336360
Didn't see your response on News Group.  Thank you, it worked!!
What is 'Quadpart', can't find any documentation on that?
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Author Comment

by:Rik
ID: 1336361
Erik,

I'm not quite sure that solution worked.  It seemed to as it returned 119.20 when I was at work on a 120 MHz, but I am now at home and I am on a 200 MHz and it is returning 119.32.  Any ideas?  
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Expert Comment

by:sperling
ID: 1336362
Funny.

According to the docs, the return value is the *true* CPU speed (Doesn't always match the vendors specs). It is calculated by reading the same counter that is used to generate the CPU frequency. It works on my computers, I'm sorry I can't help about the 200MHz (Is the 200MHz a Intel CPU, BTW?)

The quadpart is a 'Comp', which is borlands 64-bit signed integer value. It can't be used for much besides storing values and converting to floats, as you can't normally use DIV MOD and so on on a comp.


Regards,

Erik.
0
 

Author Comment

by:Rik
ID: 1336363
Erik,

Tried the code on a 75 MHz today and it too displayed 119.32 MHz.
Yes, the 200 MHz is an Intel.  When I boot up, the first thing displayed is 'Pentium = 200 MHz'.  If you hear of another way to get the clock speed, please let me know.  Thank you for your time.
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