AMD Radeon Pro 580 vs AMD Radeon RX 6900 XT Comparison

Head-to-Head Benchmarks

The recorded data includes three shared benchmark tests between the AMD Radeon RX 6900 XT and the AMD Radeon Pro 580: Geekbench Metal, Geekbench OpenCL, and Geekbench Vulkan. Across all three, the RX 6900 XT claims a clean sweep with 3 wins to 0.

In Geekbench Metal, the RX 6900 XT scores 177,021 against the Pro 580's 39,213. That is a delta of 351.4% in favor of the RX 6900 XT. To put it differently, the RX 6900 XT delivers more than four times the Metal performance of the Pro 580. This is the largest relative gap among the three tests, and it underscores how dramatically the newer architecture accelerates compute workloads exposed through Apple's Metal API.

Geekbench OpenCL shows an even steeper numeric margin. The RX 6900 XT posts 187,673, while the Pro 580 manages 38,457. The delta here is 388%, the highest of the trio. OpenCL is a cross-platform compute standard, and the RX 6900 XT's advantage suggests that its shader throughput and memory bandwidth translate into outsized gains for general-purpose GPU compute tasks. The Pro 580's score is less than a fifth of the RX 6900 XT's output.

Geekbench Vulkan narrows the gap somewhat, but the outcome remains lopsided. The RX 6900 XT scores 148,525 versus the Pro 580's 43,285, a delta of 243.1%. While Vulkan is a lower-level API that can favor different hardware designs, the RX 6900 XT still outperforms the Pro 580 by nearly two and a half times. Interestingly, the Pro 580's Vulkan score (43,285) is actually higher than its Metal score (39,213), whereas the RX 6900 XT's Metal score (177,021) exceeds its Vulkan score (148,525) by a wide margin. This indicates that the two cards have different API efficiency profiles, but the sheer performance gap dominates any architectural nuance.

Looking at the broader benchmark database, the RX 6900 XT holds an average benchmark score of 50,951 across all recorded tests, placing it in the 86th percentile of all GPUs. Its nearest rivals include the NVIDIA CMP 50HX (average score 51,790, delta -1.6%), the AMD Radeon RX Vega 64 (50,001, delta 1.9%), the NVIDIA GeForce RTX 5070 Ti (49,957, delta 2%), and the Intel Arc A550M (49,737, delta 2.4%). The RX 6900 XT sits essentially at parity with this cluster, trading blows within a 2.4% window. This positioning suggests that while it is not the absolute top performer in the database, it is firmly in the upper echelon.

The Pro 580, by contrast, has an average benchmark score of 40,318 and sits in the 82nd percentile. Its nearest rivals are the NVIDIA GeForce RTX 5070 (40,377, delta -0.1%), the AMD Radeon Pro WX 7100 (40,063, delta 0.6%), the AMD Radeon Pro 5300 (40,870, delta -1.4%), and the NVIDIA RTX A500 Mobile (39,568, delta 1.9%). The Pro 580 is also tightly grouped with its peers, but that group sits roughly 20% lower in absolute average score than the RX 6900 XT's group. In percentage terms, the RX 6900 XT's average score is about 26.4% higher than the Pro 580's.

Architecture Differences

The two cards come from completely different eras and design philosophies. The RX 6900 XT is built on the Navi 21 chip using RDNA 2.0 architecture, fabricated on a 7 nm process at TSMC. It belongs to the Navi II (RX 6000) generation. The Pro 580 uses the Ellesmere chip with GCN 4.0 architecture, manufactured on a 14 nm process at GlobalFoundries, and sits in the Radeon Pro Mac (500 Series) generation. The process node difference alone, 7 nm versus 14 nm, explains part of the performance gap: the RX 6900 XT packs 26,800 million transistors into a 520 mm² die, for a transistor density of 51.5 million per mm². The Pro 580 has 5,700 million transistors on a 232 mm² die, density of 24.6 million per mm². That is more than double the density on the RX 6900 XT.

The RX 6900 XT also features dedicated ray tracing hardware with 80 RT cores, whereas the Pro 580 has no RT cores at all. This is a fundamental architectural divergence: RDNA 2.0 was designed with hardware-accelerated ray tracing in mind, while GCN 4.0 predates that feature entirely. The RX 6900 XT also has a significantly larger execution engine: 5,120 shading units, 320 texture mapping units, and 128 raster operations units. The Pro 580 offers 2,304 shading units, 144 TMUs, and 32 ROPs. In every count, the RX 6900 XT has more than double the resources of the Pro 580.

Memory subsystems differ as well. The RX 6900 XT uses 16 GB of GDDR6 on a 256-bit bus, yielding 512.0 GB/s of bandwidth. The Pro 580 has 8 GB of GDDR5 on a 256-bit bus, yielding 217.0 GB/s. The bus width is identical, but the memory type and clock speeds (2000 MHz versus 1695 MHz, with effective rates of 16 Gbps versus 6.8 Gbps) create a 2.36x bandwidth advantage for the RX 6900 XT. Clock speeds on the GPU cores also diverge: the RX 6900 XT has a base clock of 1825 MHz, boost of 2250 MHz, and a game clock of 2015 MHz, while the Pro 580 runs at 1100 MHz base and 1200 MHz boost, with no game clock recorded.

API support reflects the generational gap. The RX 6900 XT supports DirectX 12 Ultimate (12_2), Vulkan 1.4, and OpenGL 4.6. The Pro 580 supports DirectX 12 (12_0), Vulkan 1.3, and OpenGL 4.6. The RX 6900 XT also reports FP16 performance of 46.08 TFLOPS (2:1 ratio) versus the Pro 580's 5.530 TFLOPS (1:1 ratio), meaning the RX 6900 XT can double its FP32 throughput on FP16 workloads, while the Pro 580 cannot. FP32 compute is 23.04 TFLOPS on the RX 6900 XT versus 5.530 TFLOPS on the Pro 580, a 4.17x difference.

FAQ

Q: Which card has more shading units?

A: The AMD Radeon RX 6900 XT has 5,120 shading units, while the AMD Radeon Pro 580 has 2,304. That is more than twice the count on the RX 6900 XT.

Q: What is the memory bandwidth difference?

A: The RX 6900 XT provides 512.0 GB/s of bandwidth from 16 GB of GDDR6 on a 256-bit bus. The Pro 580 provides 217.0 GB/s from 8 GB of GDDR5 on the same 256-bit bus width. The RX 6900 XT's bandwidth is about 2.36 times higher.

Q: Does either card support ray tracing hardware?

A: Only the RX 6900 XT has dedicated ray tracing cores, with 80 RT cores on the Navi 21 chip. The Pro 580 has no RT cores listed, as GCN 4.0 does not include hardware ray tracing.

Q: How do the two cards compare in Geekbench Vulkan?

A: The RX 6900 XT scores 148,525 versus the Pro 580's 43,285, a delta of 243.1% in favor of the RX 6900 XT.

Q: What are the process nodes and transistor counts?

A: The RX 6900 XT is built on a 7 nm TSMC process with 26,800 million transistors. The Pro 580 is on a 14 nm GlobalFoundries process with 5,700 million transistors.

Q: Which card has a higher pixel rate?

A: The RX 6900 XT achieves 288.0 GPixel/s, while the Pro 580 achieves 38.40 GPixel/s. The RX 6900 XT's pixel rate is 7.5 times higher.

Specification Differences

| Specification | AMD Radeon RX 6900 XT | AMD Radeon Pro 580 |

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

| Architecture | RDNA 2.0 | GCN 4.0 |

| Process Node | 7 nm | 14 nm |

| Transistors | 26,800 million | 5,700 million |

| Die Size | 520 mm² | 232 mm² |

| Transistor Density | 51.5M / mm² | 24.6M / mm² |

| Base Clock | 1825 MHz | 1100 MHz |

| Boost Clock | 2250 MHz | 1200 MHz |

| Game Clock | 2015 MHz | null |

| Memory Clock | 2000 MHz (16 Gbps effective) | 1695 MHz (6.8 Gbps effective) |

| Memory Size | 16 GB | 8 GB |

| Memory Type | GDDR6 | GDDR5 |

| Memory Bandwidth | 512.0 GB/s | 217.0 GB/s |

| Shading Units | 5120 | 2304 |

| TMUs | 320 | 144 |

| ROPs | 128 | 32 |

| RT Cores | 80 | null |

| Pixel Rate | 288.0 GPixel/s | 38.40 GPixel/s |

| Texture Rate | 720.0 GTexel/s | 172.8 GTexel/s |

| FP32 | 23.04 TFLOPS | 5.530 TFLOPS |

| FP16 | 46.08 TFLOPS (2:1) | 5.530 TFLOPS (1:1) |

| TDP | 300 W | 185 W |

| Slot Width | Triple-slot | IGP |

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

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

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

| Vulkan Support | 1.4 | 1.3 |

| Display Outputs | 1x HDMI 2.1, 2x DisplayPort 1.4a, 1x USB Type-C | Portable Device Dependent |

The Verdict

The benchmark data is unambiguous: the AMD Radeon RX 6900 XT outperforms the AMD Radeon Pro 580 in every recorded head-to-head test, with deltas ranging from 243.1% to 388%. The RX 6900 XT also holds a higher percentile ranking (86th versus 82nd) and a higher average benchmark score (50,951 versus 40,318). Anyone choosing between these two purely on performance should select the RX 6900 XT without hesitation.

However, context matters. The Pro 580 is a mobile or integrated form factor card (slot width listed as IGP, no power connectors, portable device dependent outputs) designed for Apple Mac systems in the 500 Series generation. It consumes 185 W versus the RX 6900 XT's 300 W, and it does not require external power connectors. The RX 6900 XT, by contrast, is a triple-slot desktop card needing two 8-pin power connectors and a 700 W suggested PSU. The Pro 580's lower power draw and compact design may suit specific system constraints, but its performance ceiling is far below the RX 6900 XT's.

The RX 6900 XT also offers future-facing features like DirectX 12 Ultimate, Vulkan 1.4, and hardware ray tracing, none of which the Pro 580 can match. Its 16 GB of memory and 512.0 GB/s bandwidth make it suitable for high-resolution textures and compute-heavy workloads. The Pro 580's 8 GB and 217.0 GB/s are adequate for its era but clearly limiting today.

Where Each One Wins

The RX 6900 XT wins in every measurable performance category from the database: Metal, OpenCL, and Vulkan compute. It also wins on theoretical throughput metrics: FP32, FP16, pixel rate, texture rate, and memory bandwidth are all multiples of the Pro 580's figures. For gaming, rendering, machine learning training (where FP16 matters), or any GPU compute task, the RX 6900 XT is the clear choice. Its 80 RT cores provide a capability the Pro 580 simply does not have.

The Pro 580's only advantages are practical rather than performance-based. Its 185 W TDP is lower, it has no external power connector requirement, and it is designed as an integrated GPU (IGP) form factor, which means it can fit into systems where a triple-slot card cannot. The Pro 580 also uses a 14 nm process with fewer transistors, which historically correlates with lower manufacturing cost, though pricing data is not recorded for this card. For a legacy Mac Pro or a compact workstation where power delivery and physical space are constrained, the Pro 580 remains functional, but it is not competitive on raw numbers.

In summary, the RX 6900 XT is the superior performer in all recorded benchmarks and all architectural specifications. The Pro 580 is a lower-power, smaller-form-factor alternative that sacrifices performance dramatically. The data shows no scenario where the Pro 580 wins on speed, but it may be the only option in systems that cannot accommodate the RX 6900 XT's physical and power requirements.