AMD Radeon RX 7900 XTX to Feature 24GB GDDR6 Memory @ 20Gbps with a 384-bit Bus [Rumor]

AMD will announce its RDNA 3 flagship on the 3rd of November to tackle the newly launched GeForce RTX 4090. The Radeon RX 7900 XTX will feature the full-fledged Navi 31 die, six memory dies (MCD), and a 384-bit bus. From what we’ve heard in the past months, each of the MCDs will consist of a 64-bit bus and 32MB of L3 cache (16MB planar + 16MB 3D V-Cache). In addition, the XTX has been paired with 24GB of GDDR6 memory running at 20Gbps, just slightly slower than the (24GB GDDR6X) 22.5Gbps found on the RTX 4090.

Over the past weeks, we’ve discussed the Navi 31 graphics core in excruciating detail. It’ll feature 12,288 shaders across 48 WPGs and 6 Shader Arrays. The finer-grained specs are as follows:

GPU NameRX 7700 XT (Navi 33)RX 7800 XT (Navi 32)RX 7900 XT (Navi 31)RX 7950 XT (Navi 30?)
Process Node6nm5nm + 6nm5nm + 6nm5nm + 6nm
Die Config6nm x15nm x1, 6nm x45nm x1, 6nm x55nm x1, 6nm x6
Shader Engines2466
Memory Bus128-bit256-bit320-bit?384-bit?
Memory Capacity8GB16GB20GB?24GB?
Infinity Cache64MB128MB192MB192MB?
LaunchQ4 2022Q1 2023Q4 20222023

The RX 7900 XT will come with a cut-down GPU and bus. The Graphics Die packs 10,752 cores alongside a 320-bit bus paired with 20GB of GDDR6 memory clocked at 20Gbps. The memory configuration indicates that there will be just five instead of six memory complex dies. The cache will be “castrated” as well, down to 160MB across five MCDs (each 16MB 1Hi+ 16MB 2Hi).

Both the RX 7900s will rock a Type-C adapter, two Display Ports, and a single HDMI port.


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