Caporegime
- Joined
- 18 Sep 2009
- Posts
- 30,293
- Location
- Dormanstown.
I Don't know, all i know is on the face of it Tonga is exactly the same GPU as Tahiti, it has the same specifications, but they are not the same GPU.
One is Tonga, a GCN 1.2 GPU with over 2x the Tessellation Throughput, Delta Colour Compression, Texture Compression.... the other has none of those things, it is Tahiti, GCN 1.0, a different architecture. its faster per Shader.
Likewise this has the same specifications as Hawaii, but its not listed as Hawaii, its listed as Grenada, this may indicate that like Tonga is to Tahiti it has the same specifications but is also not the same GPU.
Who knows.
But a 7770 is a different GPU name to a 7970, despite having the same architecture etc.
I just think you try and over complicate.
I'd be surprised if the 390X is anything other than an 8GB 290X, but I'd be disappointed if it's exactly that.