Hello,   I'm not seeing that processor model listed in my parts database. It may not be the issue, but I wouldn't rule it out, either. However, based on the description you provided, it sounds like a faulty system board to me, too. You might consider removing procs 3 and 4, in order to complete POST, and then try flashing the BIOS to latest (assuming it isn't already). I mention this because the latest BIOS includes this line under the enhancements list:   -Updated the Intel Xeon E7-8800/4800/2800 product families A2 stepping Microcode to version 0x3B.   Hello,   I'm not seeing that processor model listed in my parts database. It may not be the issue, but I wouldn't rule it out, either. However, based on the description you provided, it sounds like a faulty system board to me, too. You might consider removing procs 3 and 4, in order to complete POST, and then try flashing the BIOS to latest (assuming it isn't already). I mention this because the latest BIOS includes this line under the enhancements list:   -Updated the Intel Xeon E7-8800/4800/2800 product families A2 stepping Microcode to version 0x3B.EDIT: I think I've identified the issue. The TDP of the proc in question is 130W. According to the docs, only 2x 130W procs can be used together. E7-8870 Specs: [URL]
I have a PowerEdge M910 that only seems to recognize two processors. I've installed four Xeon E7-8870 processors into the machine.  When booting up, I receive a message which states that the flexmem bridge is missing.  So I swapped out all four processors with a different set of the same kind.  Once again, I get the same message.  I then altered the BIOS jumper, on the system board, so that it will clear the BIOS upon rebooting.  My thought was that BIOS was remembering a previous configuration.  Unfortunately, this didn't work, since I still get the same message. I'm beginning to wonder if the system board is simply defective.  However, before choosing to buy another M910 blade, I've decided to post my question, here, in order to, either confirm that my system board is defective, or to find out whether or not there's another reason for this behavior.  In any case, thank you for reading this post, and I welcome any comments/suggestions that anyone may be willing to provide.
PowerEdge M910 Only Recognizes Two Processors