HPFOCUS

Dimitris 写了：Mezz2 needs a second CPU installed in order to be used on BL460G8 / BL420G8?
As far as I know neither IBM nor DELL must have two CPUs in order to use the second mezz slot.

Predrag 写了：Information taken from quickspec for BL460c G8

Step 2: Choose Required Options (one of the following from each list unless otherwise noted)
HP Processors Core Processor Option Kits
NOTE: The BL460c Gen8 supports one or two processors.
NOTE: All configure-to-order processor kits (i.e. xxxxxx-L21) contain one (1) processor.
NOTE: If two processors are desired, select one xxxxxx-L21 here in Step 2 and one xxxxxx-B21 in Step 3.
NOTE: The BL460c Gen8 includes two I/O mezzanine expansion slots. A processor must be installed in processor slot 1 for access to the first mezzanine expansion slot (expansion slot 1). A processor must be installed in processor slot 2 for access to the second mezzanine expansion slot (expansion slot 2).
NOTE: All processors within the server must be identical.
NOTE: All processors support Intel Hyper-Threading and Intel Turbo Boost Technologies except the E5-2603 and E5-2609.
NOTE: The letter "L" following the model number indicates denotes lower wattage.
NOTE: The processor model as well as the memory configuration determines the maximum speed memory can operate. Please see the see the "Memory" section later in this document.
NOTE: The Intel Xeon E5-2620 processor does not support DIMMs at 1.35V. Using the HP RBSU, 1.35V DIMMs can be changed to operate at 1.5V.

Vincent 写了：The Sandy Bridge architecture puts the PCIe controller inside the CPU, but nothing prevents a system designer to route 2 PCIe slots to a single CPU.

HP do that in DL servers for example.

It appears that Dell and IBM haven chosen that way for their blade servers as well (and I assume not use the PCIe lanes off the second CPU), while we have made the opposite choice. I guess that could give a performance advantage in fully-loaded configs.