More Memory

I got some more memory for my computer today.  I had been planning to add 1GB to it for a long time.  It previously had only two 256MB memory sticks in it.  When I put in the new stick, it registered 256MB.  I had installed it incorrectly (not pushing it in all the way).  After it was corrected, the computer showed 1GB.  Since I had left the two old sticks in, this was puzzling.  It should have totaled 1GB 512MB.  My dad tried different orders of the sticks, as that makes a difference is some older computers.  No matter what we did, it always showed 1GB.  I figured that it might be incompatible with the other sticks, and suggested removing one 256MB.  When we did that, it showed .75GB.  That was really puzzling!  We tried a few orders of these, but always showed 256MB less than a GB.  I recommended removing the other stick, leaving only the new stick.  The computer showed 512MB!  Finally, we realized that the package in which we got the stick was not the original packaging of the stick.  It was actually a 512MB stick and the order of sticks didn't matter.