Hi YogiH, thank you for your respons. I have spoken with the Crucial Customer Service UK and accourding do my finding.: - every Module checked slot by slot (32 variations) - issue with correct setting with XMP on the MSI X99S XPower AC It was considered my the support that i may have some bad SPD's on the memeory and the Mainboard can not read them any more. Exchange was issued. I have sendet the memory today to Crucial UK for RMA. But no porblem i still have the 8 GB Modul 2400 MHz on which my system can run until i get my kit back. Should not take more than 10 working days. I'm not in the hurry.
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