Following entries on Nvidia’s upcoming GeForce RTX 3070 for notebooks, a result for the mobile GeForce RTX 3080 can now also be found in Geekbench’s online database. The benchmark read 48 shader multiprocessors on the graphics chip, i.e. 6144 shader cores. There is also 16 GB of graphics memory.
The A user made a Geekbench run with a ROG Zephyrus notebook, which relies on AMD’s not yet announced Ryzen 9 5900H on the CPU side – presumably a Zen 3 combo processor with eight CPU cores and integrated Vega graphics unit (code name Cezanne). Found the entry of the Twitter user “TUM_APISAK”.
Behind the desktop RTX 3080
With 6144 shader cores, the mobile GeForce RTX 3080 is close to the desktop RTX-3070, which uses 5888 shader cores. 6144 can be implemented with a full expansion of the ampere graphics chip GA104, which would also fit 16 GB of RAM on 256 data lines. The desktop RTX-3080 with GA102-GPU, 8704 shader cores, 320-bit interface and usually higher clock frequencies should be significantly faster.
Geekbench data for the mobile GeForce RTX 3070 already suggested that the graphics chips should be cut more strongly than with desktop PCs. The notebook model therefore has 5120 shader cores. The reason for the limitation could be the power consumption, because the RTX-3000 graphics cards for desktop PCs are significantly more power-hungry than their predecessors. In (tower) cases this can be compensated for by space for cooling and powerful power supplies, but not with notebooks.
Back to the old days
In recent years, Nvidia has relied on largely similar GPUs in desktop PCs and notebooks. The GeForce RTX 2080, for example, used 2944 shader cores in both cases, the GeForce GTX 1080 previously used 2560. Only the GPU clock frequencies were reduced in favor of efficiency.
The 3000 generation, on the other hand, is reminiscent of earlier years – the gap between desktop and mobile was last so great in 2013 with the 700 series. At that time the GeForce GTX 780 came with 2304 shader cores, the GeForce GTX 780M with 1536.