Yes but depending on who you order it from they wouldn't just put it together unless you payed for that service or you could learn and have a go at doing it your self, There is plenty of resources such as how to's, videos and us to help and it would save some money..
where i am ordering it from they put it together as part of the service and i have priced up all the parts separately and it works out that it will only cost me about £10 more to have them fit it all.
i had a look at the 770 and the r9280 but was not shure about which one to get i was told 770 is faster but the r9280 has mantle which will play BF4 better ?