PE2950 Won't Run Quad-Core CPU

[Chance Reschke]

Hi,

Just today I swapped the CPU in one of our PE2950 hosts from the dual- 
core it came with for a shiny new quad core.  Unfortunately, it  
doesn't work.  Any help in getting this sorted out would be great.

Details:

The host has the II sticker on the front which Dell claims is the  
badge of approval for quad-core compatibility.

The original CPU was an Intel Xeon, model 5148  @ 2.33GHz and was  
running fine under BIOS v1.02.

The new CPU is an Intel Xeon, model 5355 @ 2.66Ghz.  The label on the  
Dell anti-static bag it shipped in is GW622.

The Dell quote for the new CPU said:

   Quad Core Xeon 2nd Processor X5355 2x4MB Cache, 2.66GHz 1333MHz  
FSB, PE2950, Customer Install (311-6970)

When I powered up the host with the original BIOS it displayed the  
correct CPU identification, then after performing the BMC  
initialization, it complained in yellow text on a blue background:

    Unsupported CPU Combination.
    System Halted!

I then upgraded the BIOS to 2.0.1 (required reinstalling the original  
CPU), and tried again with the same results.

Any ideas?

Thanks,

Chance


--
Chance Reschke
Biochemistry Department
University of Washington