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Why does my Dell PowerEdge 2600 server show both 2.4GHz processors at 1.8GHz?

Posted on 2009-03-31
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Last Modified: 2013-12-10
I rcently moved two xeon 2.4GHz processors (and associated voltage regulator modules) from one PowerEdge 2600 to another.

The server recognizes both processors as 2.4GHz processors, but the BIOS (and subsequently, the operating system, ESX v3.5) show the clock speed at 1.8GHz.

What up with that, folks?
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Question by:Pantz
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by:jamietoner
ID: 24034838
There are 2 motherboard revisions for the PE2600 one with a 400Mhz fsb and one with a 533mhz fsb. Sounds like you moved the 2.4ghz processors(533 fsb X 4.5 multiplier= 2.4Ghz clock) from a 533Mhz board to 400Mhz board(400Mhz X 4.5 multiplier= 1.8ghz clock). Which explains the difference in the clock speeds.
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by:Pantz
ID: 24034883
So...  what you're telling me...  is...  that...  if I want to use the full capacity of those processors, I'd better move them back to the other PowerEdge?

That's odd.  Before I installed the two 2.4GHz processors - clearly a newer revision - the 2.4GHz processor that was installed showed at 2.4GHz.  I tried to move one of the newer processors to co-exist with the existing 2.4GHz processor when I discovered that it was different.

Make sense?
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jamietoner earned 250 total points
ID: 24035716
The other 2.4 probably has a 400Mhz fsb with a 6 multiplier. If you want to run them at full capacity then yes you'll need to move them back.  
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