Compare benchmarks between the two in the sager reviews section and you will get your answer. Basically the summary of the difference between these two systems is 7620 = uber fast, pretty heavy, pretty big, relatively little battery life, and goofy round track pad. The 4880 = very fast(not a 7620, but fast), fairly heavy but not unbearable, very nicely sized, great battery life, some people dont like the viewing angles of the screen, cheaper. I chose the 4880 for my uses, but I debated for many days between the 7620 and 4880. My final decision was made by the fact that I liked the two equally, but one was cheaper.