AMD Radeon Pro 455 vs AMD Radeon RX 7900 XT Comparison

The AMD Radeon RX 7900 XT and the AMD Radeon Pro 455 represent two vastly different eras and purposes in AMD’s graphics lineup. The data shows a clear hierarchy, with the RX 7900 XT dominating in shared benchmarks, but the Pro 455 holds its own in a specific Apple-centric test. This analysis breaks down their performance profiles, architectural foundations, and the practical implications of those differences based solely on the provided facts.

Where Each One Wins

The benchmark results indicate a near-total victory for the RX 7900 XT in every test where both cards appear. In the two head-to-head comparisons available, the RX 7900 XT wins both: Geekbench OpenCL and Geekbench Vulkan. The Vulkan margin is particularly stark, with the RX 7900 XT scoring 71,068 against the Pro 455’s 12,240, a delta of 480.6%. The OpenCL gap is also substantial, with the RX 7900 XT at 12,756 versus 10,336, a 23.4% advantage.

The Pro 455’s only recorded victory comes in a test the RX 7900 XT does not appear in: Geekbench Metal. There, the Pro 455 scores 15,916. However, this win is contextually narrow, as it is the sole data point for that API and the RX 7900 XT has no corresponding Metal benchmark in the pack. For every other metric, the RX 7900 XT is the definitive winner. The Pro 455’s winsA count is 0, while the RX 7900 XT holds 2 wins in direct comparisons. The Pro 455 also shows a lower average benchmark score of 12,831 compared to the RX 7900 XT’s 13,745, placing it in the 52nd percentile versus the RX 7900 XT’s 55th percentile.

Architecture Differences

The architectural chasm between these two GPUs is immense, explaining the performance gulf. The RX 7900 XT uses the Navi 31 chip on the RDNA 3.0 architecture, fabricated on a 5 nm process at TSMC. It packs 57,700 million transistors on a 529 mm² die, yielding a density of 109.1M / mm². In contrast, the Pro 455 uses the Baffin chip on the older GCN 4.0 architecture, built on a 14 nm process at GlobalFoundries. It has just 3,000 million transistors on a 123 mm² die, with a density of 24.4M / mm².

The core configurations differ by an order of magnitude. The RX 7900 XT has 5,376 shading units, 336 TMUs, and 192 ROPs, along with 84 dedicated ray tracing cores. The Pro 455 has 768 shading units, 48 TMUs, and 16 ROPs, with no ray tracing cores at all. This translates into massive throughput differences: the RX 7900 XT delivers 51.48 TFLOPS FP32 performance versus the Pro 455’s 1,313.3 GFLOPS (approximately 1.31 TFLOPS). The RX 7900 XT also has a 2:1 FP16 ratio (103.0 TFLOPS), while the Pro 455 is 1:1 (1,313.3 GFLOPS), indicating a different compute priority.

Memory architecture reinforces the divide. The RX 7900 XT features 20 GB of GDDR6 on a 320-bit bus, delivering 800.0 GB/s bandwidth. The Pro 455 has 2 GB of GDDR5 on a 128-bit bus, providing 81.28 GB/s. The RX 7900 XT also supports PCIe 4.0 x16, while the Pro 455 uses PCIe 3.0 x8. The Pro 455 is a 35 W MXM module, whereas the RX 7900 XT is a 300 W dual-slot card requiring 2x 8-pin power connectors and a suggested 700 W PSU. The RX 7900 XT also lists DirectX 12 Ultimate (12_2) and Vulkan 1.4 support, while the Pro 455 is limited to DirectX 12 (12_0) and Vulkan 1.3.

FAQ

Q: Which card has a higher average benchmark score?

A: The AMD Radeon RX 7900 XT has an average benchmark score of 13,745, which is higher than the AMD Radeon Pro 455’s 12,831. The RX 7900 XT also sits at the 55th percentile of all GPUs, compared to the Pro 455’s 52nd percentile.

Q: How much faster is the RX 7900 XT in Vulkan?

A: In the Geekbench Vulkan test, the RX 7900 XT scores 71,068, which is 480.6% higher than the Pro 455’s 12,240. This is the largest performance delta recorded between the two.

Q: Does the Pro 455 win any benchmark against the RX 7900 XT?

A: In the head-to-head data provided, the Pro 455 does not win any test against the RX 7900 XT. The wins tally is 2 for the RX 7900 XT and 0 for the Pro 455. The Pro 455’s only recorded benchmark win is in Geekbench Metal, where the RX 7900 XT has no score listed.

Q: What are the key architectural differences?

A: The RX 7900 XT uses the RDNA 3.0 architecture on a 5 nm process, while the Pro 455 uses GCN 4.0 on 14 nm. The RX 7900 XT has 5,376 shading units and 84 ray tracing cores, whereas the Pro 455 has 768 shading units and no ray tracing cores. The RX 7900 XT also has 20 GB of GDDR6 memory, while the Pro 455 has 2 GB of GDDR5.

Q: What is the memory bandwidth difference?

A: The RX 7900 XT provides 800.0 GB/s of memory bandwidth, which is approximately 9.8 times higher than the Pro 455’s 81.28 GB/s. This is due to the wider 320-bit bus and faster GDDR6 memory on the RX 7900 XT.

Q: Which card has a higher transistor count?

A: The RX 7900 XT has 57,700 million transistors, which is over 19 times the 3,000 million found on the Pro 455. This reflects the significantly larger die size of 529 mm² versus 123 mm².

Specification Differences

The table below highlights the fields where the two cards differ, omitting any shared specifications (both are AMD, both are end-of-life, both support OpenGL 4.6).

| Specification | AMD Radeon RX 7900 XT | AMD Radeon Pro 455 |

| :--- | :--- | :--- |

| Architecture | RDNA 3.0 | GCN 4.0 |

| Process Node | 5 nm | 14 nm |

| Foundry | TSMC | GlobalFoundries |

| Transistors | 57,700 million | 3,000 million |

| Die Size | 529 mm² | 123 mm² |

| Memory | 20 GB GDDR6 | 2 GB GDDR5 |

| Memory Bus | 320 bit | 128 bit |

| Bandwidth | 800.0 GB/s | 81.28 GB/s |

| Shading Units | 5376 | 768 |

| TMUs | 336 | 48 |

| ROPs | 192 | 16 |

| RT Cores | 84 | None |

| Pixel Rate | 459.6 GPixel/s | 13.68 GPixel/s |

| Texture Rate | 804.4 GTexel/s | 41.04 GTexel/s |

| FP32 | 51.48 TFLOPS | 1,313.3 GFLOPS |

| FP16 | 103.0 TFLOPS (2:1) | 1,313.3 GFLOPS (1:1) |

| TDP | 300 W | 35 W |

| Slot Width | Dual-slot | MXM Module |

| Power Connectors | 2x 8-pin | None |

| Bus Interface | PCIe 4.0 x16 | PCIe 3.0 x8 |

| Display Outputs | 1x HDMI 2.1a, 2x DisplayPort 2.1, 1x USB Type-C | Portable Device Dependent |

| DirectX | 12 Ultimate (12_2) | 12 (12_0) |

| Vulkan | 1.4 | 1.3 |

| Release Date | 2022-11-02 | 2016-10-29 |

Head-to-Head Benchmarks

The direct comparison data offers two clear data points, both favoring the RX 7900 XT. The first is Geekbench OpenCL, where the RX 7900 XT scores 12,756 against the Pro 455’s 10,336. This represents a 23.4% advantage, a substantial lead that reflects the difference in raw compute throughput (51.48 TFLOPS versus 1,313.3 GFLOPS). While OpenCL is a general compute API, the margin here is consistent with the architectural gap.

The second and more decisive result is Geekbench Vulkan. The RX 7900 XT scores 71,068, while the Pro 455 scores 12,240. The delta of 480.6% is not incremental; it is a generational leap. This massive difference likely stems from the RX 7900 XT’s modern RDNA 3.0 architecture, which includes dedicated ray tracing hardware and a much larger memory subsystem, allowing it to handle Vulkan workloads far more efficiently. The Pro 455’s GCN 4.0 design, with its 2 GB memory limit and older API support (Vulkan 1.3 versus 1.4), is severely constrained in this scenario. The RX 7900 XT’s winsA count of 2 against a winsB count of 0 is a simple summary: in every shared benchmark, it wins by a significant margin.

The Verdict

The data overwhelmingly favors the AMD Radeon RX 7900 XT for any user seeking maximum performance in modern workloads. Its 480.6% lead in Vulkan and 23.4% lead in OpenCL demonstrate a decisive advantage in compute and graphics tasks. The RX 7900 XT is also the only one of the two with ray tracing cores and DirectX 12 Ultimate support, making it suitable for current-generation gaming and professional 3D applications. Its 20 GB of memory and 800.0 GB/s bandwidth provide ample headroom for large datasets and high-resolution textures, far exceeding the Pro 455’s 2 GB capacity.

The AMD Radeon Pro 455, however, is not without a niche. Its only benchmark victory comes in Geekbench Metal, where it scores 15,916. This suggests it has a specific utility in Apple’s ecosystem, likely as a mobile GPU in older MacBook Pro models. Its 35 W TDP and MXM form factor also indicate it was designed for low-power, portable systems. For users reliant on Metal-accelerated applications in that specific hardware context, the Pro 455 remains functional. However, its GCN 4.0 architecture, lack of ray tracing, and older API support mean it cannot compete with the RX 7900 XT in any general-purpose or gaming scenario. For any new purchase or upgrade path, the RX 7900 XT is the only rational choice based on the benchmark evidence.