i am using i5 750. i am not a gamer. i usually convert hd videos and do multi tasking.I want to upgrade my pc kindly help me to choose from fx 8150 or 2500k
right now the i5 2500k is a bit more cost efficient and depending on what software you use to convert vidoes is a better performer, especially if it enables quick sync.
and if you are using quick sync, it would be better to wait for ivy bridge, because if you read the article o1die linked you'll see some spectacular gains there in the upcoming releases.
though you could start looking and telling what your budget will be is a help.