One is 4x and the other is 8x,thats the only difference as far as I know. This question should be in the media section.
different speeds as jim_dandy stated 4x dvd-r vs. 8x dvd-r, same high quality Taiyo Yuden media~ my TY army continues to grow...so much interest, so little time~ haha
No difference which one performs better. Only difference is burn speed. Both will perform equally well. Mike