Wcctech claims that AMD has finalized its first Navi GPU, which is codenamed the “Navi 12.” It will reportedly have 40 compute units and is slated for release sometime in 1H 2019. The author points out that this is not the GPU that is being worked on for the PlayStation 5; “it’s a derivative of the actual Navi die and has been created specifically so AMD can get it to market for the PC audience primarily.”
I don’t have a concrete timeline for the part, but early estimates put it in H1 2019. AMD can also choose to accelerate this part while they work on Navi 10/20. As I have previously mentioned, the true TITAN-killer from Radeon will not be landing anytime soon — early estimates put the beefy Navi 20 somewhere around 2020 and at this early in the lifecycle, these timelines can vary widely.
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Source: [H]ardOCP – First AMD Navi GPU, “Navi 12,” Will Have 40 CUs