While we're waiting for official information from AMD, there are reports making the rounds that AMD's Radeon R9 390X will be a rebrand of the Hawaii GPU. WCCF Tech writes AMD's new Fiji GPU will adopt a new name like what NVIDIA does with its Titan series.
The first thing we get by looking at the top-end card of this listing reveals that it is Hawaii simply because Fiji can not feature 8 GB HBM memory. It is limited to just 4 GB on Gen1 implementation through single-link chip design. On the other hand, we know that Hawaii offered in the 300 series family will be a 8 GB card as it will be based on custom designs at launch. The second card which we believe is Tonga is also quite spot on with the leaks, we know that the Radeon R9 285 Tonga features just 2 GB VRAM across a 256-bit bus.
It confirms why we see a sudden VRAM gap between the Radeon R9 370 which is the Pitcairn based card that does come in 4 GB VRAM models. There’s a possibility that AMD introduces the full Tonga XT chip with 2048 stream processors in the line with 4 GB VRAM as the Radeon R9 380X. Rest of the lineup includes the Bonaire XT and Bonaire Pro based Radeon R7 360X and Radeon R7 360 cards which feature just 2 GB GDDR5 VRAM.