AMD Radeon RX 6800 XT vs AMD Radeon RX Vega 64 Comparison

The AMD Radeon RX Vega 64 and the AMD Radeon RX 6800 XT represent two distinct eras of AMD's GPU architecture, separated by three years of engineering. The data from the benchmark database shows a clear generational leap, with the RX 6800 XT outperforming its predecessor in every recorded test. While the Vega 64 holds an 86th percentile ranking among all GPUs, the RX 6800 XT sits at the 85th percentile, yet their average benchmark scores tell a different story: the Vega 64 averages 50,001 points, while the RX 6800 XT averages 48,477. This apparent contradiction is resolved by examining the specific workloads and architectural philosophies behind each card.

Where Each One Wins

The head-to-head benchmark results are unambiguous: the RX 6800 XT wins all four recorded comparisons. In the demanding 3DMark Steel Nomad DX12 test, the RX 6800 XT scores 3,689 points against the Vega 64's 1,669, a 54.8% advantage. This is the closest margin between the two cards, yet it still represents a dominant victory for the newer architecture. The gap widens further in compute-oriented benchmarks, where the RX 6800 XT's RDNA 2 design shows its strengths.

The Geekbench OpenCL test illustrates this divide most starkly. The RX 6800 XT produces 171,304 points, while the Vega 64 manages only 62,552, a 63.5% deficit. This massive delta suggests that the newer card is far more efficient at handling parallel compute workloads, likely due to its redesigned shader array and higher clock speeds. Similarly, in Geekbench Metal, the RX 6800 XT scores 181,337 versus the Vega 64's 68,750, a 62.1% lead. The Vulkan test shows a 51% advantage for the RX 6800 XT, with scores of 136,875 and 67,032 respectively.

The Vega 64's only consolation is that it retains a higher average benchmark score than the RX 6800 XT when looking at all GPUs in the database, with 50,001 versus 48,477. However, this metric is skewed by the fact that the RX 6800 XT's dataset includes additional PassMark tests that drag down its average. In direct competition, the RX 6800 XT wins every single head-to-head matchup, making it the clear choice for gamers and compute users alike. The older card's performance is not without merit, but it is consistently outclassed by roughly 51% to 63% across all tested APIs.

Architecture Differences

The architectural divide between these two GPUs is profound, representing a shift from AMD's long-running GCN design to the RDNA family. The Vega 64 is built on the Vega 10 chip using GCN 5.0 architecture, fabricated on a 14 nm process at GlobalFoundries. It packs 12,500 million transistors into a 495 mm² die, yielding a transistor density of 25.3 million per square millimeter. In contrast, the RX 6800 XT uses the Navi 21 chip with RDNA 2.0 architecture, manufactured on TSMC's 7 nm process. This newer node allows AMD to cram 26,800 million transistors into a slightly larger 520 mm² die, achieving a density of 51.5 million per square millimeter—more than double the older card.

Clock speeds tell a similar story of generational progress. The Vega 64 operates at a base clock of 1247 MHz and boosts to 1546 MHz, while the RX 6800 XT starts at 1825 MHz and boosts to 2250 MHz, with a game clock of 2015 MHz. This 700+ MHz boost clock advantage is a major factor in the newer card's performance dominance. Memory configurations also diverge sharply: the Vega 64 uses 8 GB of HBM2 across a 2048-bit bus, delivering 483.8 GB/s of bandwidth, whereas the RX 6800 XT employs 16 GB of GDDR6 on a 256-bit bus, achieving 512.0 GB/s. The newer card's higher bandwidth, combined with double the capacity, gives it a clear edge in texture-heavy workloads.

The compute units are arranged differently as well. The Vega 64 features 4096 shading units, 256 texture mapping units, and 64 ROPs, while the RX 6800 XT increases these to 4608 shading units, 288 TMUs, and 128 ROPs. Notably, the RX 6800 XT introduces 72 ray tracing cores, a feature entirely absent from the Vega 64. Pixel and texture rates follow the expected pattern: the Vega 64 delivers 98.94 GPixel/s and 395.8 GTexel/s, while the RX 6800 XT more than doubles the pixel rate to 288.0 GPixel/s and pushes texture rate to 648.0 GTexel/s. FP32 compute scales from 12.66 TFLOPS on the Vega 64 to 20.74 TFLOPS on the RX 6800 XT, with FP16 similarly rising from 25.33 to 41.47 TFLOPS.

FAQ

Q: Which card has a higher average benchmark score?

A: The AMD Radeon RX Vega 64 has a higher average benchmark score of 50,001 points, compared to the RX 6800 XT's 48,477 points. However, this is influenced by the fact that the RX 6800 XT has a larger benchmark dataset, and in direct head-to-head tests, the RX 6800 XT wins all four comparisons.

Q: How much faster is the RX 6800 XT in the 3DMark Steel Nomad DX12 test?

A: The RX 6800 XT scores 3,689 points, while the Vega 64 scores 1,669 points. This represents a 54.8% advantage for the RX 6800 XT, the smallest margin of victory across all four head-to-head benchmarks.

Q: What is the biggest performance gap between the two cards?

A: The largest delta is 63.5%, observed in the Geekbench OpenCL test. The RX 6800 XT produces 171,304 points versus the Vega 64's 62,552, indicating a substantial lead in compute-oriented workloads.

Q: Does the Vega 64 support ray tracing?

A: No, the Vega 64 does not have ray tracing cores. The RX 6800 XT includes 72 dedicated ray tracing cores, which are absent from the older GCN-based design.

Q: How do the memory specifications differ?

A: The Vega 64 uses 8 GB of HBM2 on a 2048-bit bus with 483.8 GB/s bandwidth. The RX 6800 XT uses 16 GB of GDDR6 on a 256-bit bus with 512.0 GB/s bandwidth, offering double the capacity and slightly higher bandwidth.

Q: Which card has higher clock speeds?

A: The RX 6800 XT has significantly higher clocks, with a base of 1825 MHz and boost of 2250 MHz. The Vega 64 operates at a 1247 MHz base and 1546 MHz boost, making the newer card roughly 700 MHz faster at boost.

Specification Differences

| Specification | AMD Radeon RX Vega 64 | AMD Radeon RX 6800 XT |

|---|---|---|

| Chip | Vega 10 | Navi 21 |

| Architecture | GCN 5.0 | RDNA 2.0 |

| Process Node | 14 nm | 7 nm |

| Foundry | GlobalFoundries | TSMC |

| Transistors | 12,500 million | 26,800 million |

| Die Size | 495 mm² | 520 mm² |

| Transistor Density | 25.3M / mm² | 51.5M / mm² |

| Base Clock | 1247 MHz | 1825 MHz |

| Boost Clock | 1546 MHz | 2250 MHz |

| Game Clock | N/A | 2015 MHz |

| Memory Size | 8 GB | 16 GB |

| Memory Type | HBM2 | GDDR6 |

| Memory Bus | 2048 bit | 256 bit |

| Memory Bandwidth | 483.8 GB/s | 512.0 GB/s |

| Shading Units | 4096 | 4608 |

| TMUs | 256 | 288 |

| ROPs | 64 | 128 |

| Ray Tracing Cores | N/A | 72 |

| Pixel Rate | 98.94 GPixel/s | 288.0 GPixel/s |

| Texture Rate | 395.8 GTexel/s | 648.0 GTexel/s |

| FP32 Performance | 12.66 TFLOPS | 20.74 TFLOPS |

| FP16 Performance | 25.33 TFLOPS (2:1) | 41.47 TFLOPS (2:1) |

| TDP | 295 W | 300 W |

| Suggested PSU | 600 W | 700 W |

| Bus Interface | PCIe 3.0 x16 | PCIe 4.0 x16 |

| Display Outputs | 1x HDMI 2.0b, 3x DisplayPort 1.4a | 1x HDMI 2.1, 2x DisplayPort 1.4a, 1x USB Type-C |

| DirectX Support | 12 (12_1) | 12 Ultimate (12_2) |

| Vulkan Support | 1.3 | 1.4 |

| Length | 280 mm (11 inches) | 267 mm (10.5 inches) |

| Height | 111 mm (4.4 inches) | 120 mm (4.7 inches) |

| Width | 40 mm (1.6 inches) | 50 mm (2 inches) |

| Release Date | 2017-08-06 | 2020-10-27 |

| Launch MSRP | 499 USD | 649 USD |

Head-to-Head Benchmarks

The 3DMark Steel Nomad DX12 test serves as a modern gaming workload proxy, and the RX 6800 XT's 3,689 points versus the Vega 64's 1,669 points demonstrates a 54.8% performance advantage. This benchmark is particularly relevant because it stresses the latest DirectX 12 features, where the RX 6800 XT's DirectX 12 Ultimate support and ray tracing cores provide a structural edge. The Vega 64's older GCN architecture, limited to DirectX 12 (12_1), simply cannot match the newer card's throughput in this scenario.

Moving to Geekbench Metal, the RX 6800 XT scores 181,337 against the Vega 64's 68,750, a 62.1% lead. This benchmark is crucial for macOS and iOS developers, but its compute-heavy nature also reveals the raw processing power of each card. The RX 6800 XT's higher FP32 throughput of 20.74 TFLOPS, combined with its 4608 shading units, explains why it dominates in this test. The Vega 64, with only 4096 shading units and 12.66 TFLOPS, is fundamentally outmatched here.

The Geekbench OpenCL test shows the widest margin of all: the RX 6800 XT scores 171,304 versus 62,552, a 63.5% difference. OpenCL is a general-purpose compute API, and this result indicates that the RX 6800 XT is significantly better suited for non-gaming workloads like rendering, machine learning inference, and scientific computing. The newer card's 128 ROPs, double the Vega 64's 64, also contribute to its superior performance in rasterization-heavy OpenCL tasks.

Finally, the Geekbench Vulkan test sees the RX 6800 XT scoring 136,875 against the Vega 64's 67,032, a 51% advantage. This is the closest margin outside of Steel Nomad, suggesting that the Vega 64's GCN architecture retains some efficiency in Vulkan workloads. However, the RX 6800 XT still wins decisively, thanks to its higher clock speeds and improved memory bandwidth. Across all four tests, the RX 6800 XT wins every matchup, with an average delta of approximately 58% in its favor. The Vega 64, despite being an end-of-life product, remains competitive in its percentile ranking, but the data is clear: the RX 6800 XT represents a massive generational leap that leaves its predecessor far behind.