If you're patient enough, yes should wait.
If you're NOT patient enough, then yes you should buy the R9 280X then sell it after once the Tonga XT cards are out.
If you're patient enough, yes should wait.
If you're NOT patient enough, then yes you should buy the R9 280X then sell it after once the Tonga XT cards are out.
patrichpachich :
buy a R9 270x
and if tonga xt cards are about to release
sell your r9 270x
The price is going to drop a lot though, and nVdia's Maxwell is coming September, so Tonga shouldn't be much longer either