Do the 17.3.1 drivers work properly on a R9 390 "Yet"

Do the 17.3.1 drivers work properly on a R9 390 "Yet", or is AMD only intrested in supporting the Rx 400+ cards and newer.

 

As all I hear is problems fixed for that card

 

The other thing is, if AMD trully believe in their own products why is the testing of the drivers performed on an intel pc. Not a AMD pc.

 

Testing conducted by AMD Performance Labs as of March 4, 2017 on the Radeon™ RX 480 graphics card, on a test system comprising "Intel i7 5960X CPU", 16GB DDR4-2666 Mhz system memory