Quote Originally Posted by Paul
...are you sure you don't have 512mb? 448mb is a random number; your video is probably using 64mb of shared memory.
+1
RAM came in 64MB, 128, 256, 512, 1GB, 2GB, etc. If you have a number like that more than likely it does have 512MB of RAM but it can be allocated to other resources. I'd check and see how much RAM you have in your machine and also how much it can hold. Nowadays, 512MB of RAM is nothing.