[jmarshall]

you are correct. running videos off the network uses a cache in ram, so uses more memory. it's obviously getting kinda low in 1080i mode when you are upsampling videos to the gui resolution (ie playing the video in 1080i or whatever) - try reducing your cache. more memory would help in this issue, but if reducing the cache causes all your videos to run in 1080i, and doesn't effect performance, you don't need the extra memory, obviously.