3 Replies Latest reply on Jun 28, 2010 9:16 AM by Dan_O

    Strange DIMM problems


      I have been trying build to a system with motherboard SS520SC and two Xeon E5540 (Max. memory: 1066 MHz).  I have tried to install six Intel certified KVR1066D3Q8R7S/4GI DIMMs, but I've run into the following issues:


      1) If I populate A-1, B-1, C-1, D-1, E-1, & F-1, I get an amber light on B-1, indicating that the DIMM on B-1 is bad even though it is not defective.


      2) I keep all the DIMMs in their slots but I just remove C-1.   I don't see any error messages and I get 20 Gb of RAM @ 1066 MHz.


      3) I put the DIMM that was on C-1 (the one that was causing an error message on B-1) into slot A-2, I get the full 24 Gb of RAM with no errors, but the frequency drops to 800 MHz, which should be according to the manual.


      All the DIMMs are brand new.  I've moved them around different channels and they all seem to work fine.  Also, I've updated the BIOS to the latest one (S5500.86B.01.00.0050.050620101605, 5/6/2010).


      I don't understand why I get an error message on B-1 when I put a DIMM on C-1.  I have had long chats with Intel tech support staff and they have no idea!   I was told to call 916-377-7000 for additional tech support, but this number doesn't seem to work!


      Can somebody in this forum offer a solution???????????


      Can somebody tell if the performance will be better with 20 Gb @ 1066 MHz or with 24 Gb @ 800 MHz?  If the performance is about the same, I'll move one of the DIMMs to A-2 and leave C-1 empty.


      Thanks in advance for your help.