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Thanks Denis Kelley, all four memory sticks are the same brand, size and speed DDR3 1600MHz and any of the four work when only installing

I tried to boot using only one RAM bar at a time in DIMM_A2, DIMM_B1 and DIMM_B2, but the PC wouldn't boot 2 RAM bars, one is DIMM_A1 and one in DIMM_A2 PC Bandwidth: The major difference is that four sticks of RAM offer double the bandwidth of 2 sticks of RAM · Performance: Considering your motherboard and CPU

bikini paradise slot demo 2 of 4 and my laptop has 2 slots for the ram If you put another stick of ram into your laptop then Task Manager will show Slots used: 2 of 2 Lenovo has given me faulty laptop with 2 RAM slots but only one of them is working 4) ram and its working perfectly fine Following