I recently bought a Maximus VII Formula along with an i7-4790k to upgrade my aging AM3-based system. I kept my Kingston RAM on the basis that it's good enough for me (2x Kingston KHX18C9T2K2/8X 8GB kits).
Initially everything worked perfectly, including my RAM at its advertised speed of 1866MHz. Within a few days my CPU died however, which I RMAed to great success - Intel has truly amazing customer service. Upon receiving a new CPU, I find that my RAM no longer operates at 1866MHz, but works fine at the default 1333MHz. When trying to raise the speed to anything above 1333MHz, including using XMP profiles, the system refuses to boot, giving Q-code of 55 (Memory not installed). Additionally, attempting to use CPU Level Up feature results in the same Q-code, which also did not happen before the CPU RMA.
What could cause this? I have checked the CPU socket for bent pins, and all of them appear pristine. I've tried individual DIMMs (no change), remounted the CPU and cooler (no change), and tried resetting the UEFI (no change). I know that the RAM isn't on the QVL, but just the same it worked before the CPU RMA. I have the exact same model of CPU as before, so I can't think of anything that would've changed.
EDIT: I should note that the system works perfectly at stock clocks. Rock-solid for gaming, CAD work, Linpack etc.
Initially everything worked perfectly, including my RAM at its advertised speed of 1866MHz. Within a few days my CPU died however, which I RMAed to great success - Intel has truly amazing customer service. Upon receiving a new CPU, I find that my RAM no longer operates at 1866MHz, but works fine at the default 1333MHz. When trying to raise the speed to anything above 1333MHz, including using XMP profiles, the system refuses to boot, giving Q-code of 55 (Memory not installed). Additionally, attempting to use CPU Level Up feature results in the same Q-code, which also did not happen before the CPU RMA.
What could cause this? I have checked the CPU socket for bent pins, and all of them appear pristine. I've tried individual DIMMs (no change), remounted the CPU and cooler (no change), and tried resetting the UEFI (no change). I know that the RAM isn't on the QVL, but just the same it worked before the CPU RMA. I have the exact same model of CPU as before, so I can't think of anything that would've changed.
EDIT: I should note that the system works perfectly at stock clocks. Rock-solid for gaming, CAD work, Linpack etc.
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