AMD Radeon RX 6800 XT & Radeon RX 6800 16 GB Graphics Cards Review – Here’s Big Navi!

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AMD Radeon RX 6000 'Big Navi' GPU Lineup - RX 6900 XT, RX 6800 XT, RX 6800

The AMD RDNA 2 architecture that powers the Radeon RX 6000 series graphics cards are based on the same 7nm process from TSMC but with its own enhancements. AMD claims a 50% perf per watt uplift for RDNA 2 over RDNA 1 and there is a range of technologies that make it all work. AMD's bet on 7nm definitely seems like it has paid off as users will be receiving massive performance uplifts over previous generation offerings.

AMD Radeon RX 6000 Series Gaming Graphics Cards - Bringing Competition Back in The Enthusiast Segment

AMD is offering three cards as a start for its RDNA 2 generation which includes the Radeon RX 6900 XT, the Radeon RX 6800 XT, and the Radeon RX 6800.

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Following is what AMD has to offer in its RDNA 2 powered Big Navi Radeon RX 6000 series graphics card stack:

AMD Radeon RX 6900 XT "Big Navi 21 XT" GPU Powered 16 GB Graphics Card

The AMD Radeon RX 6900 XT will come packed with the Navi 21 XTX GPU which is the fully enabled die featuring 80 Compute Units or 5120 SPs. The card will also feature 16 GB of GDDR6 memory across a 256-bit bus interface, a 512 GB/s total bandwidth, and clock speeds of 2015 MHz base and 2250 MHz boost at reference specs. There are also 80 Ray accelerators for ray-tracing enablement on the graphics cards (one RA per Compute Unit). The graphics card will feature a based TBP of 300W with factory-overclocked models pushing it above 350W and will arrive at a later date.

In addition to the standard memory, the Radeon RX 6900 XT graphics card will also feature 128 MB of Infinity Cache on the GPU die. The cache will help boost bandwidth for higher performance at resolutions beyond 1080p HD. The 128 MB Infinity Cache boosts the standard 512 GB/s bandwidth by 3.25x, delivering an effective bandwidth of up to 1.664 TB/s across all Big Navi GPU based graphics cards.

In the performance metrics shown by AMD, the Radeon RX 6900 XT with Rage Mode and Smart Access Memory enabled, features performance on par and even better in some cases than the NVIDIA's fastest GeForce RTX 3090 graphics card. The difference here is that AMD's solution not only features higher performance efficiency but also comes at a $500 US lower price point.

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AMD Radeon RX 6800 XT "Big Navi 21 XT" GPU Powered 16 GB Graphics Card

The AMD Radeon RX 6800 XT will come packed with the Navi 21 XT GPU which is a cut-down SKU featuring 72 Compute Units or 4608 SPs. The card will also feature 16 GB of GDDR6 memory across a 256-bit bus interface, a 512 GB/s total bandwidth, and clock speeds of 2015 MHz base and 2250 MHz boost at reference specs. The AMD Radeon RX 6800 XT also packs 72 Ray Accelerators which are dedicated for real-time raytracing workloads. The card will feature a based TBP of 300W with factory-overclocked models pushing it above 350W and will arrive at a later date.

In addition to the standard memory, the Radeon RX 6800 series graphics cards will also feature 128 MB of Infinity Cache on the GPU die. The cache will help boost bandwidth for higher performance at resolutions beyond 1080p HD. The 128 MB Infinity Cache boosts the standard 512 GB/s bandwidth by 3.25x, delivering an effective bandwidth of up to 1.664 TB/s across all Big Navi GPU based graphics cards.

In terms of performance, the AMD Radeon RX 6800 XT is shown to compete against the GeForce RTX 3080 graphics card. The card features a 20W lower total board power & delivers better GPU performance in several AAA titles using the best API (Vulkan / DirectX 12). AMD is also bringing its Rage-mode back which is an automatic overclocking tool within its Radeon Software suite which delivers even higher performance along with a nifty new feature known as Smart Access. Gains of up to 13% were showcased with the said features as can be seen below.

AMD Radeon RX 6800 "Big Navi 21 XL" GPU Powered 16 GB Graphics Card

The AMD Radeon RX 6800 graphics card will feature an even more cut down Navi 21 "Big Navi" GPU with 60 Compute Units of 3840 stream processors. The AMD Navi 21 XL GPU is going to feature clock speeds of 1815 MHz game and 2105 MHz boost clocks at reference specs.

It was also stated that the AMD Radeon RX 6800 with Navi 21 XL GPU could feature a TBP of 250W at stock clocks. The card will feature the same VRAM config of 16 GB GDDR6 memory, a 256-bit bus interface with the memory clocking in at 16 Gbps which will deliver a net bandwidth of 512GB/s.

The AMD Radeon RX 6800 will be featuring performance faster than the GeForce RTX 2080 Ti with smart access memory feature enabled. The graphics card will be ideally positioned against the RTX 3070 for just a $79 US higher price, yet offering much better performance and twice the memory of its main competition.

AMD Radeon RX 6000 Series "RDNA 2" Graphics Card Lineup:

Graphics CardAMD Radeon RX 6600AMD Radeon RX 6600 XTAMD Radeon RX 6700AMD Radeon RX 6700 XTAMD Radeon RX 6800AMD Radeon RX 6800 XTAMD Radeon RX 6900 XTAMD Radeon RX 6900 XT Liquid CooledAMD Radeon RX 6900 XTX
GPUNavi 23 (XL?)Navi 23 (XT)Navi 22 (XL?)Navi 22 (XT?)Navi 21 XLNavi 21 XTNavi 21 XTXNavi 21 XTXHNavi 21 XTXH
Process Node7nm7nm7nm7nm7nm7nm7nm7nm7nm
Die Size237mm2237mm2336mm2336mm2520mm2520mm2520mm2520mm2520mm2
Transistors11.06 Billion11.06 Billion17.2 Billion17.2 Billion26.8 Billion26.8 Billion26.8 Billion26.8 Billion26.8 Billion
Compute Units283236406072808080
Stream Processors179220482304256038404608512051205120
TMUs/ROPsTBA128/64TBA160/64240 / 96288 / 128320 / 128320 / 128320 / 128
Game ClockTBA2359 MHzTBA2424 MHz1815 MHz2015 MHz2015 MHz2250 MHzTBA
Boost ClockTBA2589 MHzTBA2581 MHz2105 MHz2250 MHz2250 MHz2345 MHz2435 MHz
FP32 TFLOPsTBA10.6 TFLOPsTBA13.21 TFLOPs16.17 TFLOPs20.74 TFLOPs23.04 TFLOPs24.01 TFLOPs24.93 TFLOPs
Memory Size8 GB GDDR6 + 32 MB Infinity Cache?8 GB GDDR6 + 32 MB Infinity Cache12 GB GDDR6 + 96 MB Infinity Cache?12 GB GDDR6 + 96 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache16 GB GDDR6 +128 MB Infinity Cache
Memory Bus128-bit128-bit192-bit192-bit256-bit256-bit256-bit256-bit256-bit
Memory Clock16 Gbps?16 Gbps16 Gbps?16 Gbps16 Gbps16 Gbps16 Gbps18 Gbps18 Gbps
Bandwidth256 GB/s?256 GB/s384 GB/s384 GB/s512 GB/s512 GB/s512 GB/s576 GB/s576 GB/s
TDPTBA160WTBA230W250W300W300W330W330W
Price$299-$329 ?$379 USTBA$479 US$579 US$649 US$999 US~$1199 US~$1199 US
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