Both the RX 6800 and RX 6800 XT feature 128 MB of rapid access, on-die storage that increases the bandwidth of the built-in video memory. One of the ways it accomplishes this is through its brand new store of Infinity Cache. What that means, in essence, is that watt for watt the RX 6000 series is going to kick out more frames at a higher frequency than the original RDNA architecture was capable of. AMD quotes 1.54x performance per watt compared to last-gen and up to 1.3x higher frequency. RDNA 2 is a big leap forward for AMD and offers real world benefits for gamers. RDNA 2: The New ArchitectureTo really understand the RX 6000 series and how the specs above come into play, we have to dig a little deeper into what’s going on within the chip itself. It also includes a USB Type-C output for easily connecting virtual reality headsets. Before moving into the architecture, you should also know that the card features one HDMI 2.1 output and two DisplayPort 1.4 with integrated Display Stream Compression (DSC) for running high performance gaming monitors. Compared to the RTX 3070 or RTX 3080, which would maybe hit 2 GHz without a manual overclock, you can see how impressive that speed boost is. Loading up a game with complete stock speeds, the RX 6800 XT immediately ramped up to 2400 MHz and pushed just shy of 2500 MHz with Rage Mode engaged. Even without those, I was surprised to see what the card was capable of. AMD’s Radeon Software comes also with several presets, including the much anticipated Rage Mode (which raises the power limits on the card), and an automatic overclocking option that removes the legwork from figuring out a stable, notched up frequency. The Radeon 6800 XT offers a “Game Clock” of 2015 MHz and a Boost Clock of up to 2250 MHz. The guaranteed clock speeds are impressive, though as we’ve seen with cards for a number of years, they really only hint at what the cards may achieve. In real world terms, I wasn’t able to notice any difference while gaming, but it’s worth being aware as game engine development continues to advance. In other words, this Navi GPU has faster memory than you might expect from GDDR6, but it still doesn’t compare well to the G6X in the RTX 3080. There, the 6800 XT is substantially faster than the RTX 3070’s 448 GB/s. If we go down a step to the RTX 3070, we find a much more “apples to apples” comparison since it is also running GDDR6 on a 256-bit bus. The RTX 3080 uses the cutting edge GDDR6X and offers a maximum memory bandwidth of 760 GB/s. If you recall from my review of the RTX 3080 Founders Edition, the RX 6800 XT’s main competitor, this memory configuration isn’t as fast. It marries that with 16GB of GDDR6 memory (topping all but the RTX 3090 from Team Green) on a 256-bit bus bearing a total bandwidth of 512 GB/s. Likewise, it features 72 Compute Units, up from 40 last-gen, and each has its hardware level ray tracing unit (which we’ll get to shortly). Last generation’s 5700 XT featured 2560 SPs, while the 6800 XT bumps that all the way to 4608. With that, the GPU has received a massive expansion in Stream Processors, which are responsible for game rendering. Like the RX 5700 XT, it uses AMD’s 7nm process, but the transistor count has more than doubled, going from 10.3 billion to 26.8 billion. The RX 6800 XT is built on AMD’s RDNA 2 architecture. What really matters is what that heatsink is keeping cool.
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