AMD Radeon RX 6800 vs NVIDIA RTX PRO 4500 Blackwell Comparison

The NVIDIA RTX PRO 4500 Blackwell and AMD Radeon RX 6800 represent two very different approaches to high-performance graphics, separated by nearly five years of architecture evolution. The data shows a decisive overall victory for the NVIDIA part, which wins all nine head-to-head benchmark comparisons, yet the RX 6800 remains a competitive option in its own right, particularly when considering its position within the broader GPU landscape.

Head-to-Head Benchmarks

The most significant margin comes in the modern DirectX 12 workload, where the RTX PRO 4500 Blackwell scores 7025 in 3DMark Steel Nomad against the RX 6800’s 3188. That is a 120.4% advantage, meaning the NVIDIA card more than doubles the AMD card’s performance in this demanding test. This is not a marginal win; it is a generational leap that reflects the Blackwell architecture’s ability to handle contemporary rendering pipelines with substantially greater efficiency.

Compute workloads show a similar pattern, though less extreme. In PassMark GPU Compute, the RTX PRO 4500 Blackwell scores 19255 versus 10864 for the RX 6800, a 77.2% delta. This gap is particularly relevant for users whose work involves GPGPU tasks, as the NVIDIA card’s raw compute throughput is nearly 80% higher. The Vulkan API benchmark reinforces this trend, with the NVIDIA card scoring 221768 against 115107, a 92.7% advantage that shows the Blackwell GPU’s strength in cross-platform graphics APIs.

The legacy DirectX tests reveal consistent but narrower leads for the NVIDIA card. In PassMark DirectX 10, the score is 204 versus 128, a 59.4% delta. DirectX 11 shows 320 versus 214, a 49.5% advantage. DirectX 9 yields 397 versus 257, a 54.5% delta. Even the oldest API in the test suite, DirectX 12, shows a 33.7% lead for the NVIDIA card, with scores of 119 and 89 respectively. These results indicate that the RTX PRO 4500 Blackwell does not merely excel in modern workloads; it maintains its superiority across a broad spectrum of API generations.

The overall PassMark G3D score, which aggregates general 3D rendering performance, stands at 33360 for the NVIDIA card versus 22067 for the AMD card, a 51.2% delta. The 2D performance gap is smaller but still substantial, with PassMark G2D scores of 1336 and 990, a 34.9% difference. Across all nine benchmarks, the RTX PRO 4500 Blackwell wins every single test, with deltas ranging from 33.7% to 120.4%.

Where Each One Wins

The RTX PRO 4500 Blackwell wins in every category measured, but the magnitude of its victories varies by workload type. The largest margins appear in modern, compute-heavy scenarios: the 120.4% lead in 3DMark Steel Nomad and the 92.7% lead in Vulkan. These are the benchmarks that best reflect contemporary game engines and professional 3D applications, where Blackwell’s architectural advantages are most pronounced. The 77.2% lead in GPU compute further solidifies the NVIDIA card’s position for tasks like rendering, simulation, and machine learning inference.

The RX 6800’s best relative performance comes in the DirectX 12 test, where its 33.7% deficit is the smallest across all benchmarks. This suggests that the AMD card is not entirely outclassed in modern API environments, though it still trails significantly. The RX 6800 also shows its most competitive showing in 2D performance, with a 34.9% gap that is close to its DirectX 12 result.

For users prioritizing raw compute throughput or the latest DirectX 12 Ultimate features, the RTX PRO 4500 Blackwell is unequivocally the stronger choice. The RX 6800, however, may still serve well for users whose workloads are less demanding or who are constrained by other factors such as system compatibility. The AMD card’s performance, while lower in absolute terms, is not negligible — its PassMark G3D score of 22067 places it in the 75th percentile of all GPUs, just one point below the NVIDIA card’s 76th percentile.

Architecture Differences

The fundamental distinction lies in the manufacturing process and transistor density. The RTX PRO 4500 Blackwell is built on a 5 nm process at TSMC, while the RX 6800 uses a 7 nm process. This allows the NVIDIA chip, designated GB203, to pack 45,600 million transistors into a 378 mm² die, yielding a density of 120.6 million transistors per square millimeter. The AMD Navi 21 chip, by contrast, contains 26,800 million transistors spread across a larger 520 mm² die, resulting in a density of just 51.5 million per square millimeter. The Blackwell chip achieves nearly 2.4 times the transistor density of the RDNA 2.0 part, which explains much of its performance advantage.

Memory configuration also differs sharply. The RTX PRO 4500 Blackwell offers 32 GB of GDDR7 memory on a 256-bit bus, delivering 896.0 GB/s of bandwidth. The RX 6800 provides 16 GB of GDDR6 memory on the same 256-bit bus, but bandwidth drops to 512.0 GB/s. This 384 GB/s difference is substantial, and the NVIDIA card’s memory capacity is double that of the AMD card, a critical factor for large datasets in professional workloads.

The compute resources are heavily skewed toward the NVIDIA card. The RTX PRO 4500 Blackwell features 10,496 shading units, 328 TMUs, and 112 ROPs, along with 82 ray tracing cores and 328 tensor cores. The RX 6800 has 3,840 shading units, 240 TMUs, and 96 ROPs, with 60 ray tracing cores and no tensor cores. The FP32 throughput tells the story: the NVIDIA card delivers 50.53 TFLOPS, while the AMD card manages 16.17 TFLOPS. The RTX PRO 4500 Blackwell also sustains FP16 at the same 50.53 TFLOPS rate, whereas the RX 6800 achieves 32.33 TFLOPS FP16 only via a 2:1 ratio.

Clock speeds and power draw present a nuanced picture. The RX 6800 has a higher base clock at 1700 MHz versus 1635 MHz for the NVIDIA card, but the RTX PRO 4500 Blackwell boosts higher to 2407 MHz versus 2105 MHz. Despite the performance advantage, the NVIDIA card consumes less power, with a TDP of 200 W versus 250 W for the AMD card. The RX 6800 requires a 600 W suggested PSU and dual 8-pin connectors, while the RTX PRO 4500 Blackwell asks for a 550 W PSU and a single 16-pin connector. The NVIDIA card also supports PCIe 5.0 x16, while the AMD card is limited to PCIe 4.0 x16.

The Verdict

The data is unambiguous: the RTX PRO 4500 Blackwell outperforms the RX 6800 in every single benchmark, with margins ranging from 33.7% to 120.4%. For any user prioritizing raw performance, modern API support, or compute throughput, the NVIDIA card is the definitive choice. Its 32 GB of GDDR7 memory, 50.53 TFLOPS FP32 performance, and lower power draw make it a superior option for professional workloads, content creation, and high-end gaming alike.

The RX 6800, however, remains a viable option for users with lighter requirements. Its 16 GB of GDDR6 memory and 16.17 TFLOPS FP32 are adequate for many 1440p gaming scenarios or entry-level professional tasks. Its 75th percentile ranking among all GPUs indicates it still outperforms the vast majority of graphics cards in existence. The RX 6800’s launch MSRP was 579 USD, and while it is now end-of-life, it can still deliver solid performance in less demanding applications.

The choice ultimately depends on whether the user’s workloads can benefit from the RTX PRO 4500 Blackwell’s overwhelming advantages. For those who need maximum performance in DirectX 12, Vulkan, or compute, the NVIDIA card is the only rational selection. For those who are content with lower absolute performance and have budget or system constraints, the RX 6800 offers a functional, if less capable, alternative.

FAQ

Q: Which GPU has a higher average benchmark score?

A: The NVIDIA RTX PRO 4500 Blackwell has an average benchmark score of 31532, while the AMD Radeon RX 6800 scores 30095, a difference of approximately 4.8%.

Q: What is the largest performance gap between the two GPUs?

A: The largest gap is in 3DMark Steel Nomad DX12, where the RTX PRO 4500 Blackwell scores 7025 versus 3188 for the RX 6800, a 120.4% advantage.

Q: How does memory bandwidth compare between the two cards?

A: The RTX PRO 4500 Blackwell offers 896.0 GB/s of bandwidth with 32 GB of GDDR7 memory, while the RX 6800 provides 512.0 GB/s with 16 GB of GDDR6 memory.

Q: What is the transistor density difference?

A: The RTX PRO 4500 Blackwell achieves 120.6 million transistors per mm², while the RX 6800 has 51.5 million per mm², based on their respective die sizes and transistor counts.

Q: Which GPU has a higher boost clock?

A: The RTX PRO 4500 Blackwell boosts to 2407 MHz, while the RX 6800 boosts to 2105 MHz, despite the AMD card having a higher base clock of 1700 MHz versus 1635 MHz.

Q: Are both GPUs compatible with DirectX 12 Ultimate?

A: Yes, both the RTX PRO 4500 Blackwell and the RX 6800 support DirectX 12 Ultimate (12_2), as well as OpenGL 4.6 and Vulkan 1.4.