I ordered the X200T with 1Gb of RAM and planned to upgrade the RAM myself. I bought a Corsair 2Gb stick and put it in the spare slot but memory errors were detected. So I swapped the sticks but memory errors still occurred. Thinking the RAM must have been incompatible, I took out the original 1Gb out and this time no memory errors and all was great. I decided to upgrade to 4Gb so I bought another identical stick of Corsair 2Gb and put it the other slot. However, memory errors are being detected. So does the X200T support RAM in both memory sockets or have I just bought the wrong branded RAM? I did not purchase the two Corsair 2Gb sticks at the same time or place. Could they have different specs and cause problems?