In my last thread I played some games to get an old X58 system up and running near its intended speed. Ironically its been almost a year to the day and it seems some part of this system is acting up. The system failed to POST and gave beeping sounds corresponding to a memory issue as well as an error code corresponding to a memory issue. I took out all the memory and tried each one alone in the slot furthest away from the CPU. Each one passed POST so each stick works fine. Next I tried adding sticks starting from the furthest slot and working closer to the CPU. 2 sticks on the same memory channel (X58 used triple channel memory) was able POST. 3 sticks with 2 sticks on one channel and 1 stick on other failed POST every time. Was dual channel allowed on X58 motherboards? I tried all slots on the same channel using 2 sticks and they all passed POST which suggests the physical slots are fine as well. Trying a triple channel configuration worked fine only if the memory was in one color slot (blue) and not the other color (black). Putting 2 sticks in one channel, the one furthest away from the CPU and 1 stick in other channels also passed POST. Putting 2 sticks in two channels and 1 stick in the remaining channel only passed POST when the center channel black slot was empty. From this behavior I know each memory stick works and all the slots work. I'm left to conclude this is a memory controller problem or some problem with the motherboard aside from the slot. At times I utilize over 20GB of memory for work. I have it running now with 12 GB in triple channel mode but that is not a long term solution. Does anyone have any suggestions on what to do from here? What do you think the cause of the problem is? I tested both default and "OC" settings mentioned in the previous thread.