390 and 390x and 290 and 290x rebrands, although there are some improvements (lower TDP, possibly higher performance), which could be due to some arch improvements as well as being fabbed at GloFo instead of TSMC (I recall that being a rumor anyway).
The real interesting cards, that are in fact very cheap, are the Radeon Fury series. $500-650 for blazingly fast cards is a good deal. Then there is the R9 Nano which is amazing.
Hopefully in the future AMD will have a real answer to PhysX by Nvidia and then I will be interested in buying a card of their's for me. Until then the only time I will buy one is for a build for my daughter who I named after AMD. GL to AMD though in the future with these 300 series cards and more.
There's no need for it cause many developers have gotten to the point where the in-game physics are good enough that PhysX isn't required anymore. the only games that have PhysX are Nvidia based titles. other than that no one really cares for PhysX anymore.
For the very few games that use physx. Normally when it is used it just adds something random flapping in the wind. 2008 has come and gone, everyone forgot about it
the line up is a bit strange. i don't think there will be a 380x. or a 370x
the announcement was a bit weird.
they announced these cards exactly
R7-360
R7-370
R9-380
R9-390
R9-390x
R9-Fury
R9-Fury X
R9 Nano
the only things that have X variants are the Fury and the 390. i think they are going to get rid of the X variants next gen. so that we have 5 GPUS per line-up like Nvidia.