From what i can work out (im saying this from the crucial scan i did), my 1024GB of ram is working and my pc is registering the 2nd new DDR ram card. but when i was on the crucial.com website and did their scan they could only detect one of my ram cards and said there was a spare slot and my pc was capable of 2000Gb of ram. my mother board is a Intel VL35g motherboard...not entirely sure if i right on that. dont even know how to check what mother board i have lol