AMD has presented the first three graphics cards with RDNA-2 architecture: Radeon RX 6900 XT, Radeon RX 6800 XT and Radeon RX 6800. All three use the same navigation system – 21 – GPU alias “Big Navi” in different expansion stages. Architectural improvements, a revised cache system and increased clock frequencies ensure more performance and efficiency, so that AMD can again compete with Nvidia in the high-end: The Radeon RX 6900 XT is on par with the GeForce RTX 3090 – sometimes one is faster, sometimes the other.

The Navi graphics chip 21 consists 26, 8 billion transistors and comes off the production line at TSMC in a 7 nanometer process. AMD speaks of revised data paths and compute units (CUs) in order to double the performance compared to RDNA 1 together with higher clock frequencies. This happens without excessive increase in power consumption: The energy efficiency increases by up to 65 percent.

AMD’s presentation of the Radeon-RX – 6000 -Series alias “Big Navi”.

(Source: AMD) Huge “Infinity Cache” Largest The innovation is probably the intermediate buffer called “Infinity Cache”, which is said to be inspired by the level 3 cache of the company’s own Ryzen processors. He is on all three sat nav – 21 – full models 117 MByte and should relieve the memory interface: The latter is 256 Bit narrow and always binds 16 GByte GDDR6-RAM. The interaction of Infinity Cache and 250 – The bit interface should effectively match the CUs 117 Provide percent more bandwidth than a “classic” 300 – bit interface – and thereby 90 Absorb percent of the energy.

Render image of the navigation system – 21 – Graphics chips.

(Image: AMD)

For comparison: Nvidia’s GeForce RTX 3090 couples 24 GByte of highly developed GDDR6X-RAM on such a 384 – bit interface. The L2 cache (as a last-level cache) is 6 MB in size. The Radeon RX 6800 XT as the fastest “Big Navi” offshoot with 80 CUs (4608 shader cores) should be about as fast its like the GeForce RTX 3090. In 3D games that are good for AMD, including “Battlefield 5” and “Forza Horizon 4”, your own top model should be able to set itself apart from the competition, in others, for example in “The Division 2” and “Resident Evil 3” . If the numbers are correct, they would be even more efficient.

Model RX 6900 XT RX 6800 XT RX 6800 GPU Navi 21 Navi 21 Navi 21 Compute Units 80 72 60 Shader cores 5120 4608 3840 Game / max. Boost 2015 / 2250 MHz 2015 / 2250 MHz 1815 / 2105 MHz Computing power (FP 32) 20, 6 TFlops 18, 6 TFlops 17, 9 TFlops Graphics memory 16 GByte GDDR6 16 GByte GDDR6 16 GByte GDDR6 Transfer rate possibly 512 GByte / s possibly. 512 GByte / s possibly. 512 GByte / s Total Board Power 300 Watt 300 Watt 250 Watt Price 1000 U.S. dollar 650 U.S. dollar 580 U.S. dollar The Radeon RX 6800 XT with 72 CUs or 4608 Shader cores meanwhile competes with the GeForce RTX 3080 and the Radeon RX 6000 (60 CUs, 3840 shader) in future with the GeForce RTX 3070. In AMD’s own benchmark comparison with the GeForce RTX 2080 Ti (which is as fast as the RTX 3070 ) the Radeon RX 6000 is consistently ahead, sometimes clearly. With 16 instead of 8 GB as with the GeForce RTX 3070 could be the Radeon RX 6800 the secret star of the 5120 he series

AMD benchmarks for “Big Navi” (5 images) Radeon RX 6000 vs. . GeForce RTX 2080 Ti in Ultra HD.
Auto-OC mode “Rage” With the introduction of the RX – 6000 series, AMD expands its own driver with new functions. “Rage” represents an automated overclocking mode that – probably with the help of increased power consumption – provides a clock margin for the Radeon RX 6900 XT, Radeon RX 6000 XT and Radeon RX 6800. Up to 235 MHz difference between realistic game clock and maximum boost suggest an OC cushion.

Smart Memory Access goes one step further than Nvidia’s RTX IO based on Microsoft’s D