I have 3 DDR3 ram all with 2048mb. They all are the same brand and have the same frequency. When I go to resource manager it says I only have 2048 mb of ram but inside my computer I have 3 sticks of ram with all 2048 mob. The only software on my computer that says I do have 6 gb of ram is CPU-Z. The channel on my ram is dual. I'm not that good at ram so any help would be nice. Thanks