AMD Radeon Pro W6800X vs NVIDIA GeForce RTX 5090 Comparison

Head-to-Head Benchmarks

The only directly comparable benchmark in the database is Geekbench OpenCL, and the result is not close. The NVIDIA GeForce RTX 5090 scores 334,370, while the AMD Radeon Pro W6800X scores 124,498. That puts the RTX 5090 ahead by 62.8% in this single test. This is a massive gap, reflecting the generational leap between the two cards. The RTX 5090's OpenCL score is 2.7 times higher than the Radeon Pro W6800X's, which is the kind of margin that translates into dramatically shorter render times or faster compute workloads in real-world applications.

Looking at the broader database averages, the picture is more complicated. The Radeon Pro W6800X has an average benchmark score of 160,671 across its recorded tests, placing it in the 97th percentile of all GPUs. The RTX 5090, despite its dominant OpenCL showing, has an average score of 79,842 and sits in the 92nd percentile. The reason for this discrepancy is that the RTX 5090's benchmark set includes many different tests, including several Passmark DirectX entries where it posts lower raw numbers, which drags down its average. The Radeon Pro W6800X only has two recorded benchmarks, both of which are high-scoring compute tests.

For context on the Radeon Pro W6800X, its nearest rivals in the database are the NVIDIA A100 PCIe 40 GB (1.1% lower average score), the AMD Radeon PRO W7800 (2.6% lower), the NVIDIA RTX A5500 (2.8% lower), and the NVIDIA RTX 4500 Ada Generation (3.3% lower). This means the W6800X is essentially trading blows with those professional-grade cards, all of which are within a few percentage points of each other. The RTX 5090's nearest rivals are a different story: the NVIDIA Tesla P100 PCIe 16 GB (0.3% higher), the NVIDIA Tesla P100 PCIe 12 GB (0.6% higher), the AMD Radeon RX 6850M XT (1.1% lower), and the AMD Radeon Pro Vega 64X (1.4% lower). These are much older cards, and the RTX 5090's average is being pulled down by its diverse test suite.

Architecture Differences

The architectural gap between these two GPUs is enormous. The AMD Radeon Pro W6800X uses the Navi 21 chip built on RDNA 2.0, fabricated on a 7 nm process at TSMC. It packs 26,800 million transistors on a 520 mm² die, giving a transistor density of 51.5 million per square millimeter. The NVIDIA GeForce RTX 5090 uses the GB202 chip with Blackwell 2.0 architecture, also from TSMC but on a 5 nm process. It holds 92,200 million transistors on a 750 mm² die, achieving a density of 122.9 million per square millimeter. That is more than double the transistor density of the AMD card, which explains the massive compute capability difference.

The core configurations reflect this gap. The Radeon Pro W6800X has 3,840 shading units, 240 texture mapping units, and 96 render output units. It also has 60 ray tracing cores and no tensor cores. The RTX 5090, by contrast, features 21,760 shading units, 680 TMUs, and 176 ROPs. It has 170 ray tracing cores and 680 tensor cores. The shading unit count alone is 5.7 times higher on the NVIDIA card, and the tensor core count is particularly significant for AI-accelerated workloads.

Clock speeds also differ substantially. The AMD card runs at a base clock of 1800 MHz with a boost of 2087 MHz. The NVIDIA card has a base of 2017 MHz and boosts to 2407 MHz. Memory clocks are also different: the Radeon Pro W6800X runs its GDDR6 memory at 2000 MHz (16 Gbps effective), while the RTX 5090 runs GDDR7 at 1750 MHz (28 Gbps effective).

Memory configuration is another major divergence. Both cards have 32 GB of VRAM, but the AMD uses GDDR6 on a 256-bit bus, yielding 512.0 GB/s of bandwidth. The RTX 5090 uses GDDR7 on a 512-bit bus, delivering 1.79 TB/s of bandwidth. That is 3.5 times the memory bandwidth, which is crucial for high-resolution textures and large data sets.

The power and physical characteristics are starkly different. The Radeon Pro W6800X has a TDP of 200 W, uses an Apple MPX power connector, and requires a 550 W power supply. It is a quad-slot card, measuring 267 mm in length and 120 mm in height, with no listed width. The RTX 5090 has a TDP of 575 W, uses a single 16-pin connector, and needs a 950 W power supply. It is a dual-slot card, measuring 304 mm long, 137 mm high, and 40 mm wide.

Where Each One Wins

The RTX 5090 wins decisively in raw compute throughput. Its FP32 performance is 104.8 TFLOPS versus 16.03 TFLOPS for the Radeon Pro W6800X, a 6.5 times advantage. FP16 performance is 104.8 TFLOPS (1:1 ratio) versus 32.06 TFLOPS (2:1 ratio), so the NVIDIA card also leads there. Pixel rate is 423.6 GPixel/s versus 200.4 GPixel/s, and texture rate is 1,636.8 GTexel/s versus 500.9 GTexel/s. In every throughput metric, the RTX 5090 is ahead by a wide margin.

The Radeon Pro W6800X wins in the context of its intended platform. It is designed for Apple MPX bus interface and uses Apple MPX power connectors, making it a drop-in solution for Mac Pro systems. Its 200 W TDP means it can be deployed in systems with a 550 W power supply recommendation, and its quad-slot design with four Thunderbolt outputs plus one HDMI 2.1 output is tailored for Mac-centric workflows. It is also an end-of-life product, so it is available in the used market and in existing Mac systems.

The RTX 5090 is an active product with a PCIe 5.0 x16 interface, making it compatible with a wide range of PC platforms. Its dual-slot design and 16-pin power connector are standard for modern PC builds. It supports three DisplayPort 2.1b outputs and one HDMI 2.1b output.

For specific workload types, the RTX 5090's 680 tensor cores give it a decisive edge in AI tasks, while its 170 ray tracing cores make it far more capable in ray-traced rendering. The Radeon Pro W6800X has 60 ray tracing cores, which handle basic RT workloads but at a much lower performance level. The 32 GB VRAM on both cards is identical in capacity, but the RTX 5090's 1.79 TB/s bandwidth versus 512.0 GB/s means it can feed data to the compute units much faster.

FAQ

Q: Which card has more memory bandwidth?

A: The NVIDIA GeForce RTX 5090 has 1.79 TB/s of bandwidth, while the AMD Radeon Pro W6800X has 512.0 GB/s. The RTX 5090 offers 3.5 times the memory bandwidth.

Q: Are both cards the same in terms of VRAM capacity?

A: Yes, both have 32 GB of VRAM. However, the AMD card uses GDDR6 on a 256-bit bus, while the NVIDIA card uses GDDR7 on a 512-bit bus.

Q: Which card is more power-efficient?

A: The AMD Radeon Pro W6800X has a 200 W TDP and requires a 550 W power supply. The RTX 5090 has a 575 W TDP and requires a 950 W power supply. The AMD card draws significantly less power.

Q: Can the Radeon Pro W6800X be installed in a standard PC?

A: The database shows it uses an Apple MPX bus interface and Apple MPX power connectors, indicating it is designed for Apple Mac Pro systems rather than standard PCIe slots.

Q: What is the transistor count difference?

A: The RTX 5090 has 92,200 million transistors, while the Radeon Pro W6800X has 26,800 million. The NVIDIA chip has 3.4 times more transistors.

Q: Which card has a higher average benchmark score?

A: The Radeon Pro W6800X has an average benchmark score of 160,671, while the RTX 5090 has an average of 79,842. However, the RTX 5090 wins the only direct head-to-head comparison in Geekbench OpenCL by 62.8%.

The Verdict

The data paints a clear picture. The NVIDIA GeForce RTX 5090 is the superior performer in raw compute, with 6.5 times the FP32 throughput, 3.5 times the memory bandwidth, and a 62.8% lead in the direct OpenCL comparison. Its architecture is more advanced, with a 5 nm process, 122.9 million transistors per square millimeter, and 680 tensor cores that enable AI acceleration the AMD card cannot match. Any workload that is compute-bound, ray-tracing-bound, or AI-bound will see massive gains on the RTX 5090.

The AMD Radeon Pro W6800X is not without merit. Its 200 W TDP and 550 W power supply requirement make it far easier to integrate into existing systems. Its quad-slot design and Apple MPX interface mean it is the only choice for Mac Pro users who need a drop-in GPU upgrade. Its 97th percentile ranking versus the RTX 5090's 92nd percentile shows that its average benchmark score is higher, though this is heavily influenced by the different test sets.

For PC builders, the choice is straightforward. The RTX 5090 is the more powerful card in every measurable compute metric and is an active product with current driver support. The Radeon Pro W6800X is end-of-life and limited to Apple platforms. If you need maximum performance in OpenCL compute, ray tracing, or AI workloads, the RTX 5090 is the only rational choice. If you are maintaining a Mac Pro system and need a 32 GB GPU that fits the MPX interface, the W6800X is your option, but it will deliver performance in a completely different class.

Specification Differences

| Specification | AMD Radeon Pro W6800X | NVIDIA GeForce RTX 5090 |

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

| Architecture | RDNA 2.0 | Blackwell 2.0 |

| Process Node | 7 nm | 5 nm |

| Transistors | 26,800 million | 92,200 million |

| Die Size | 520 mm² | 750 mm² |

| Transistor Density | 51.5M / mm² | 122.9M / mm² |

| Base Clock | 1800 MHz | 2017 MHz |

| Boost Clock | 2087 MHz | 2407 MHz |

| Memory Clock | 2000 MHz (16 Gbps effective) | 1750 MHz (28 Gbps effective) |

| Memory Type | GDDR6 | GDDR7 |

| Memory Bus Width | 256 bit | 512 bit |

| Memory Bandwidth | 512.0 GB/s | 1.79 TB/s |

| Shading Units | 3840 | 21760 |

| TMUs | 240 | 680 |

| ROPs | 96 | 176 |

| RT Cores | 60 | 170 |

| Tensor Cores | None | 680 |

| Pixel Rate | 200.4 GPixel/s | 423.6 GPixel/s |

| Texture Rate | 500.9 GTexel/s | 1,636.8 GTexel/s |

| FP32 | 16.03 TFLOPS | 104.8 TFLOPS |

| FP16 | 32.06 TFLOPS (2:1) | 104.8 TFLOPS (1:1) |

| TDP | 200 W | 575 W |

| Slot Width | Quad-slot | Dual-slot |

| Power Connectors | Apple MPX | 1x 16-pin |

| Suggested PSU | 550 W | 950 W |

| Bus Interface | Apple MPX | PCIe 5.0 x16 |

| Display Outputs | 1x HDMI 2.1, 4x Thunderbolt | 1x HDMI 2.1b, 3x DisplayPort 2.1b |

| Length | 267 mm | 304 mm |

| Height | 120 mm | 137 mm |

| Width | Not listed | 40 mm |

| Production Status | End-of-life | Active |

| Release Date | 2021-08-02 | 2025-01-29 |

| Launch MSRP | 2,799 USD | 1,999 USD |