AMD Radeon Pro W6800X vs NVIDIA RTX A5500 Comparison

NVIDIA RTX A5500 and AMD Radeon Pro W6800X are both end-of-life workstation GPUs targeting the highest tier of professional compute, yet they approach the task from radically different design philosophies. The data available for direct comparison is limited but revealing: the RTX A5500 holds a commanding lead in the sole head-to-head benchmark, while the W6800X counters with a distinct advantage in a platform-specific test. Both cards occupy the 98th percentile of all GPUs, placing them at the apex of performance, but their architectural choices and benchmark profiles suggest they are optimized for different workflows and ecosystems.

Head-to-Head Benchmarks

The only direct comparison available is Geekbench OpenCL, where the NVIDIA RTX A5500 delivers a decisive victory. The RTX A5500 scores 174,637 points against the AMD Radeon Pro W6800X's 123,773 points, resulting in a 41.1% advantage for NVIDIA. This is a substantial gap that cannot be dismissed as a minor statistical variation. The data shows the RTX A5500's raw compute throughput, measured at 34.10 TFLOPS for FP32, is more than double the W6800X's 16.03 TFLOPS, and this disparity manifests directly in the OpenCL result. The RTX A5500's average benchmark score of 161,075 further reinforces its position, while the W6800X trails at 160,309, a negligible 0.5% difference in aggregate terms.

However, the story does not end with NVIDIA's triumph. The W6800X counters with a Geekbench Metal score of 196,844, a benchmark that the RTX A5500 does not have a recorded result for in this data. This is a critical omission because Metal is Apple's graphics API, and the W6800X is explicitly designed for Mac Pro systems, as its "Radeon Pro Mac" generation name indicates. The RTX A5500's Geekbench Vulkan score of 147,513 does not translate to Metal performance, and without a direct comparison, the data implies that AMD's card is the superior choice for Apple-centric rendering tasks. The 41.1% OpenCL delta is a massive win for NVIDIA, but the W6800X's Metal score suggests it has a specialized strength that the benchmark suite does not capture in a head-to-head format.

The Verdict

Based strictly on the available data, the NVIDIA RTX A5500 is the superior general-purpose compute card. Its 41.1% lead in OpenCL is a decisive indicator of raw performance, and its higher FP32 throughput—34.10 TFLOPS versus 16.03 TFLOPS—provides a theoretical foundation for that result. The RTX A5500 also edges out the W6800X in average benchmark score, 161,075 to 160,309, a 0.5% margin that confirms its slight overall advantage. For users running OpenCL-accelerated workloads on standard PC platforms, the RTX A5500 is the clear pick.

The AMD Radeon Pro W6800X, however, is not without merit. Its launch MSRP is 2,799 USD, and it offers 32 GB of memory compared to the RTX A5500's 24 GB, a 33% capacity increase that could matter for memory-bound tasks. More importantly, its Geekbench Metal score of 196,844 is the highest single benchmark result in this entire comparison, surpassing even the RTX A5500's OpenCL score. The W6800X is the only card here with a Metal result, and its design for Apple MPX bus interface and Thunderbolt outputs indicates it is meant for Mac Pro systems. If the target environment is macOS, the W6800X is not just a rival—it is the only viable option in this pairing.

Architecture Differences

The two GPUs are built on entirely different architectures, which explains their divergent performance profiles. The NVIDIA RTX A5500 uses the GA102 chip under the Ampere architecture, manufactured on Samsung's 8 nm process. It packs 28,300 million transistors on a 628 mm² die, yielding a transistor density of 45.1 million per square millimeter. The AMD Radeon Pro W6800X, by contrast, employs the Navi 21 chip with RDNA 2.0 architecture, built on TSMC's 7 nm process. It contains 26,800 million transistors on a smaller 520 mm² die, achieving a higher density of 51.5 million per square millimeter. The smaller, denser AMD chip demonstrates the efficiency advantage of the 7 nm node, but it does not translate to higher raw compute.

The compute resources differ starkly. The RTX A5500 has 10,240 shading units, 320 texture mapping units, 80 RT cores, and 320 tensor cores, while the W6800X has only 3,840 shading units, 240 TMUs, and 60 RT cores, with no tensor cores at all. This 2.67x advantage in shading units for NVIDIA is the primary driver of its FP32 performance lead. The W6800X compensates with higher clock speeds: a base of 1800 MHz and boost of 2087 MHz, versus the RTX A5500's 1080 MHz base and 1665 MHz boost. Despite the higher clocks, AMD's smaller shader count caps its throughput, though its FP16 performance of 32.06 TFLOPS (2:1 ratio) exceeds the RTX A5500's 34.10 TFLOPS at 1:1 only when accounting for the double-rate execution.

FAQ

Q: Why does the NVIDIA RTX A5500 have a 41.1% higher OpenCL score than the AMD Radeon Pro W6800X?

A: The RTX A5500's FP32 compute of 34.10 TFLOPS is more than double the W6800X's 16.03 TFLOPS, and its 10,240 shading units vastly outnumber the W6800X's 3,840. This raw throughput advantage translates directly to the 174,637 versus 123,773 OpenCL results.

Q: Is the AMD Radeon Pro W6800X better for any workload?

A: Yes, the W6800X achieves a Geekbench Metal score of 196,844, which is higher than any score recorded for the RTX A5500 in this data. Since Metal is Apple's graphics API and the W6800X is designed for Mac Pro systems, it is the preferred choice for macOS-based applications.

Q: How do the memory configurations compare?

A: The W6800X offers 32 GB of GDDR6 memory on a 256-bit bus with 512.0 GB/s bandwidth, while the RTX A5500 provides 24 GB on a 384-bit bus with 768.0 GB/s bandwidth. The RTX A5500 has 50% more bandwidth, but the W6800X has 33% more capacity.

Q: What is the power consumption difference?

A: The RTX A5500 has a TDP of 230 W and uses a single 8-pin power connector, while the W6800X has a lower TDP of 200 W but uses the Apple MPX power interface. Both suggest a 550 W power supply.

Q: Which card has better API support?

A: Both cards support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The RTX A5500 adds tensor cores for AI workloads, but the W6800X's Metal support is unique in this comparison.

Q: What is the physical size difference?

A: Both cards are 267 mm long, but the RTX A5500 is 112 mm high and dual-slot, while the W6800X is 120 mm high and quad-slot, making the AMD card significantly bulkier.

Where Each One Wins

The NVIDIA RTX A5500 wins in raw compute performance, as evidenced by its 41.1% OpenCL lead and higher FP32 throughput. It is the card for OpenCL-heavy workloads such as scientific simulation, data processing, and general GPU compute on Windows or Linux platforms. Its 768.0 GB/s memory bandwidth is 50% higher than the W6800X's, which benefits memory-intensive tasks. The presence of 320 tensor cores also positions the RTX A5500 for AI and machine learning inference, though no direct benchmark data confirms this advantage.

The AMD Radeon Pro W6800X wins in Apple ecosystem integration and memory capacity. Its Geekbench Metal score of 196,844 is unmatched in this dataset, and its 32 GB memory capacity is 33% larger than the RTX A5500's 24 GB, which is critical for large datasets that exceed the RTX A5500's capacity. The W6800X's lower TDP of 200 W and higher transistor density of 51.5M/mm² indicate better energy efficiency per transistor, though its FP32 performance is lower. For Mac Pro users, the W6800X is the only option with Apple MPX bus support and Thunderbolt outputs, making it the definitive choice for macOS rendering and compute.

Specification Differences

The two cards differ across nearly every core specification. The RTX A5500 uses a larger GA102 chip (628 mm²) with more transistors (28,300 million) on an 8 nm Samsung process, while the W6800X uses a smaller Navi 21 die (520 mm²) with fewer transistors (26,800 million) on a 7 nm TSMC process. Clock speeds favor AMD: 1800 MHz base and 2087 MHz boost versus NVIDIA's 1080 MHz base and 1665 MHz boost. Memory capacity favors AMD at 32 GB versus 24 GB, but bandwidth favors NVIDIA at 768.0 GB/s versus 512.0 GB/s, with bus widths of 384-bit and 256-bit, respectively.

Compute unit counts are drastically different: NVIDIA has 10,240 shading units, 320 TMUs, 80 RT cores, and 320 tensor cores, while AMD has 3,840 shading units, 240 TMUs, and 60 RT cores, with no tensor cores. Pixel and texture rates also differ, with AMD achieving 200.4 GPixel/s and 500.9 GTexel/s versus NVIDIA's 159.8 GPixel/s and 532.8 GTexel/s. Power consumption favors AMD at 200 W versus 230 W, but slot width favors NVIDIA at dual-slot versus AMD's quad-slot. The bus interface is PCIe 4.0 x16 for NVIDIA and Apple MPX for AMD, with display outputs of 4x DisplayPort 1.4a versus 1x HDMI 2.1 and 4x Thunderbolt. Release dates differ, with NVIDIA launching on 2022-03-21 and AMD on 2021-08-02.