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After plenty of rumours and leaks, AMD's RX 6000-series graphics cards were officially announced on October 28, and today we are able to present our full reviews of both the RX 6800 and RX 6800 XT GPUs. This review is firmly focused on the RX 6800 XT, and with its UK MSRP of £599.99, AMD is hoping to strike a significant blow to Nvidia's RTX 3080 that launched in September. We put this RDNA 2-based GPU through its paces and find out just how fast it really is.
After years of the Graphics Core Next (GCN) architecture, AMD unveiled the RDNA architecture in July last year, with the RX 5700 and RX 5700 XT the first GPUs to launch utilising this new technology, and the 7nm process. As two competitive but decidedly mid-range products, AMD waited for RDNA 2 to do battle in the high end market, with its RX 6800 XT positioned firmly against Nvidia's RTX 3080.
With a US MSRP of $649, AMD has confirmed a UK price-point of £599.99, undercutting the RTX 3080's £649 price-tag. How realistic that pricing is remains to be seen, and AMD will hope it can offer significantly better supply than Nvidia could muster for its RTX 30-series products. Before committing to buy a new AMD GPU however, you need to know if it is any good – so let's dive into the review.
RX 6800 XT
RX 6800
RX 5700 XT
RX 5700
Architecture
RDNA 2
RDNA 2
RDNA
RDNA
Manufacturing Process
7nm
7nm
7nm
7nm
Transistor Count
26.8 billion
26.8 billion
10.3 billion
10.3 billion
Die Size
519 mm²
519 mm²
251 mm²
251mm²
Ray Accelerators
72
60
n/a
n/a
Compute Units
72
60
40
36
Stream Processors
4608
3840
2560
2304
Game GPU Clock
Up to 2015MHz
Up to 1815MHz
Up to 1755MHz
Up to 1625MHz
Boost GPU Clock
Up to 2250MHz
Up to 2105MHz
Up to 1905MHz
Up to 1725MHz
Peak SP Performance
Up to 20.74 TFLOPS
Up to 16.17 TFLOPS
Up to 9.75 TFLOPS
Up to 7.95 TFLOPS
Peak Half Precision Performance
Up to 41.47 TFLOPS
Up to 32.33 TFLOPS
Up to 19.5 TFLOPS
Up to 15.9 TFLOPS
Peak Texture Fill-Rate
Up to 648.0 GT/s
Up to 505.2 GT/s
Up to 304.8 GT/s
Up to 248.4 GT/s
ROPs
128
96
64
64
Peak Pixel Fill-Rate
Up to 288.0 GP/s
Up to 202.1 GP/s
Up to 121.9 GP/s
Up to 110.4 GP/s
AMD Infinity Cache
128MB
128MB
n/a
n/a
Memory
16GB GDDR6
16GB GDDR6
8GB GDDR6
8GB GDDR6
Memory Bandwidth
512 GB/s
512 GB/s
448 GB/s
448 GB/s
Memory Interface
256-bit
256-bit
256-bit
256-bit
Board Power
300W
250W
225W
185W
While we talk more about the RDNA 2 architecture itself on the next page, here we can take a high-level overview of the Navi 21 GPU that forms the basis of the RX 6800 XT.
Still fabricated on TSMC's 7nm process node, as per the RX 5000-series, Navi 21 sports a much larger GPU die, measuring 519 mm². For the RX 6800 XT, it houses 72 Compute Units (CUs), with 64 Stream Processors each, giving a grand total of 4608 shaders.
Rated clock speed has increased significantly for the RX 6000 series. The RX 6800 XT, for instance, has a rated game clock of 2015MHz and a rated boost clock of up to 2250MHz. To put that into perspective, the RX 5700 XT has a rated game clock of 1755MHz.
AMD has also increased the memory capacity, with 16GB of GDDR6 memory found on every RX 6000 SKU (so far). The memory is clocked at 16Gbps, and operates over a 256-bit memory interface for total bandwidth of 512 GB/s. However, as we will see on the next page, AMD has also implemented a 128MB Infinity Cache on the Navi 21 GPU, to significantly increase effective memory bandwidth without excess power draw.
Speaking of power, the RX 6800 XT has a rated total board power (TBP) of 300W, an increase of 75W versus the RX 5700 XT.
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