NVIDIA GeForce RTX 4080 Laptop GPU vs AMD Radeon RX 6850M XT

NVIDIA GeForce RTX 4080 Laptop GPU

The NVIDIA GeForce RTX 4080 Laptop GPU (Codename GN21-X9) is a high-end laptop GPU. It is based on the AD104 chip as the desktop RTX 4070 Ti and use the Ada Lovelace architecture. The AD104 chip offers a maximum of 7.680 shaders (e.g., the RTX 4070 Ti Desktop) from which RTX 4080 Laptop uses 7.424 and a 192 Bit memory bus. The RTX 4080 mobile uses 12 GB GDDR6 dedicated graphics memory with a clock speed of 16 or 20 Gbps (effective). The TGP (Total Graphics Power) can be configured between 60 and 150 Watt (+ 25 Watt Dynamic Boost from the CPU) leading to different performance levels (the desktop RTX 4070 Ti uses 285 Watt for comparisons). The boost clock speed ranges from 1350 MHz (at 60 Watt TGP) up to 2280 MHz (150W). Therefore, the performance is also depending a lot on the power setting used for the RTX 4080 mobile in the laptop.

The synthetic performance of the RTX 4080 is clearly above the mobile RTX 3080 Ti in our tests and only bested by the mobile RTX 4090. In actual games we saw that even demanding games with Raytracing enabled (like F1 23) could be played in QHD and maximum settings. Less demanding games like Baldur's Gate 3 can be fluently played in 4k (see results below).

The RTX 4080 offers 232 tensor cores (4th gen) that enable DLSS 3 including frame generation for supported games. Furthermore, 58 raytracing cores (4rd gen) can be used for raytracing effects in supported games.

The AD103 chip is manufactured in 5nm at TSMC (4N process).

AMD Radeon RX 6850M XT

The AMD Radeon RX 6850M XT is a mobile high-end graphics card for gaming laptops. It uses the Navi 22 chip based on the new RDNA 2 architecture. It uses all 2,560 shaders (= 40 CUs), 160 TMUs, and 64 ROPs and therefore is similar to the desktop Radeon RX 6700 XT. The 192 Bit memory system connects 12 GB GDDR6 with 18 Gbps memory speed. Furthermore, the RX6850MXT includes 96 MB Infinity Cache. AMD specified 2.463 GHz game clock for 13.3 TFLOPS theoretical performance (SP) at a TDP of 135-165 Watt. The difference to the previous RX 6800M is the slightly increased clock speed of the CPU and GPU.

The gaming performance of the RX 6850M XT should be slightly faster than the old RX 6800M which positioned itself between a RTX 3070 and 3080 for laptops. For 

The Navi 22 chip is manufactured at TSMC in the modern 7nm process.