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Quick Question about the 3820 overclocking core speed and QPI Link speed

post #1 of 4
Thread Starter 
So for some time now since i got the 3820. I have been setting the overclock to BCLK at 120 with a multiplier of 40 making it 4800mhz
Now having looked at my true clock speed it said 4326mhz with a QPI Link speed of 4800. So for ages i thought this was my true CPU speed until i actually read up on it and from what a gather this is not correct.

Upon doing some more research ive been told to set the strap to 125 and set the multiplier accordingly to 39 making it 4875mhz with a QPI Link speed of 5000mhz

http://valid.canardpc.com/0by1a4

Please tell me what is the real core speed and what is QPI Link speed
post #2 of 4
Your real core speed would be the 4800 and 4875 mhz respectively. The QPI link does not apply to you. Since the 2011 socket is a server socket, it has support for QPI link which binds two cpus together in one board in a server setup. In the consumer processors (sandy bridge-e and Ivy bridge-e) QPI link is disabled. Intel disabled QPI link to prevent people with servers from using vastly cheaper processors in their server setups. Instead, consumer processors gained the ability to overclock which is disabled in server processors.

Since the servers and consumer processors use the same socket, the QPI link pins are still there, but the technology is locked out in the processor. this is why cpu-z still picks up the QPI link signal from the socket.

Hope this helps!
  
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by soulreaper05 View Post

Your real core speed would be the 4800 and 4875 mhz respectively. The QPI link does not apply to you. Since the 2011 socket is a server socket, it has support for QPI link which binds two cpus together in one board in a server setup. In the consumer processors (sandy bridge-e and Ivy bridge-e) QPI link is disabled. Intel disabled QPI link to prevent people with servers from using vastly cheaper processors in their server setups. Instead, consumer processors gained the ability to overclock which is disabled in server processors.

Since the servers and consumer processors use the same socket, the QPI link pins are still there, but the technology is locked out in the processor. this is why cpu-z still picks up the QPI link signal from the socket.

Hope this helps!

Thanks Repped !

So what does CPU-Z and any programs report the 1st clock speed as only 4328mhz

And if the QPI link on the 2nd report (4875mhz core speed) why isnt my true core speed 5ghz
Edited by Dreamxtreme - 11/21/13 at 11:19am
post #4 of 4
Your turbo clock speed is the 4800 and 5000, make sure you have a stress on your CPU when using CPU-z this will ensure you are getting true clocks and not speed stepped.
  
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