Let's say say you have 1gig of RAM on your computer. Two 512MB sticks. But under Task Manager > Peformance, it never gets past 512 MB of usage. Is one of the RAM sticks just sitting there going to waste without ever being used? Or is it being used? Does the computer use both sticks having both of them sharing the memory used by the OS???? Or is the memory slot more like a storage for the non-used memory stick...?