We have been hearing a lot about the Radeon RX 7800 series GPUs over the last month or so. The latest tidbit claims that AMD may use salvaged Navi 31 dies for the RX 7800XT and leave Navi 32 for the RX 7800. YouTuber Moore’s Law is Dead has shared exclusive shots of a Navi 31 GPU squeezed into the Navi 32 package, proving that AMD is at least testing the configuration:
The leak claims the RX 7800XT will leverage the Navi 31 graphics die with 70 Compute Units (CUs) or 4,480 cores alongside a 256-bit bus and 64MB of L3 cache. The number of active Memory Complex Dies (MCDs) will be reduced from six to four, each consisting of a 64-bit controller and a 16MB cache chunk. The GPU will be paired with a 16GB memory buffer and a TBP of under 300W.
The primary takeaway from this report is that AMD isn’t selling that many RX 7900 XT graphics cards, leaving plenty of defective and undefective dies for the RX 7800XT. That said, it’s important to note that reusing Navi 31 cores for the $699 7800XT will be pricier than opting for the smaller Navi 32 GPU (depending on yields).
The Radeon RX 7800XT may first leverage a cut-down 60 CUs Navi 31 core, followed by the full-fledged Navi 32 later in the cycle. The latter will likely also be used for a more affordable RX 7800 with up to 50 CUs and 16GB of graphics memory. Otherwise, the 7800XT may initially become a low-volume SKU, with increased shipments as yields improve.
