The first in line is the Radeon R7 370, based on a "new" Trinidad GPU with 1024 Stream Processors, 64 TMUs and 32 ROPs. The R7 370 will be available in 2GB or 4GB GDDR5 memory versions, feature a 256-bit memory interface while the GPU will end up clocked at 975MHz with memory clocked at 1,400MHz (5.6GHz effective).
The Radeon R7 370 is pretty much a rebrand of previously available Radeon R7 265 graphics card and the same Pitcairn GPU which was first used on RAdeon HD 7800 series. Priced at US $149, it should be the crown of AMD's entry-level Radeon 300 series.
A notch below the new Radeon R7 370 is the Radeon R7 360. Based on Tobago GPU, which is pretty much a rebranded Bonaire GPU, The R7 360 packs 768 Stream Processors in 12 Compute Units, 48 TMUs and 16 ROPs. It will be available with 2GB of GDDR5 memory paired up with a 128-bit memory interface and need a single 6-pin PCI-Express power connector to satisfy the 100W TDP.
The Bonaire GPU is the same one behind the earlier available Radeon R7 260 when it came with 1GB of GDDR5 memory. The Radeon R7 360 will be priced at US $109.