More AMD Navi 23 specs get leaked in block diagram from Tesla Motors

AMD announced at CES that it would expand the RDNA2 Navi 2x GPU series with more affordable SKUs for the desktop, as well as for the laptop markets in the first half of 2021. Unfortunately, Team Red did not care to elaborate on any specs, so all the info we have on the upcoming Navi 22 and Navi 23 models comes from leaks. While the specs for the Navi 22 models (RX 6700 series) have not really been that much of a mystery since last December, the mainstream Navi 23 continued to remain shrouded in uncertainty up until recently, when Twitter leaker Patrick Schur unveiled an interesting diagram detailing the GPU system for an upcoming Tesla Model S 2021 car.

From what we can see in the diagram, the Navi 23 may prove more powerful than previously expected. As it turns out, Navi 23 would have access to 4x 2 GB GDDR6 VRAM chips produced by Samsung. Memory speed is set to 14 GT/s and the memory bus is 128-bit wide, which would translate into a total VRAM bandwidth of 224 GB/s, matching the Xbox Series S console in this regard. Tesla’s specs mention that the infotainment system powered by the Navi 23 GPU can deliver 10 TFLOPS of FP32 compute performance. Navi 23 is rumored to integrate 64 MB of Infinity Cache and 32 compute units, so that FP32 performance would translate to a core clock of around 2.44 GHz. The compute performance is also very close to what the PS5 can deliver.

The diagram does not show this, but the infotainment system is most likely still powered by a custom Intel Atom CPU. There are 2x DisplayPort and HDMI 1.4 video outputs that connect the Navi 23 GPU to the onboard displays, and the board to board connection is limited to PCIe 3.0 x8. It is entirely possible that this SKU is custom-made for the Tesla cars, so the laptop / desktop versions could get slightly better specs.

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