The product specifications of AMD’s RDNA 3 budget and midrange SKUs have leaked out via the open-source ROCm software portal on GitHub. The Radeon RX 7900 XT and 7900 XTX announced earlier this month are based on the flagship Navi 31 core. The former features 84 Compute Units or 5,376 stream processors (cores), while the latter leverages the fully enabled die with its 96 CUs or 6,144 stream processors.
Remember that, unlike the preceding RDNA 2 graphics architecture, RDNA 3 can double pump its Compute Units for 2x the IPC. The catch: This SMT-like scheduling/execution method won’t always translate into twice the performance. The results will vary from workload to workload, with highly vectorized code benefiting the most.
The Navi 32 die will pack 60 Compute Units and power the Radeon RX 7800 XT. We’re looking at 3,840 stream processors or cores paired across a 192-bit bus with a 12GB GDDR6 memory buffer. The Radeon RX 7700 XT is said to be based on Navi 33 with a total of 32 CUs comprising 2,048 shaders. The GPU will be paired with 8GB of GDDR6 memory across a 128-bit bus.
There’s a chance that the RX 7800 XT will leverage a further cut-down Navi 31 core with four to five thousand shaders, and the 7700 XT sporting the Navi 32 die and so on, but that’s just speculation at this point.
