AMD Radeon PRO W6800 vs AMD Radeon PRO W7900 Comparison

The AMD Radeon PRO W6800 and AMD Radeon PRO W7900 represent two distinct generations of workstation graphics, with the data revealing a split decision across the available benchmark suite. The W6800, built on the RDNA 2.0 architecture, claims a decisive victory in OpenCL compute workloads, while the W7900, based on RDNA 3.0, counters with a substantial lead in Vulkan performance. The overall benchmark averages differ significantly, with the W6800 posting an average score of 135,396 against the W7900’s 110,725, yet this aggregate figure masks the divergent strengths of each card. The W6800 holds a 96th percentile ranking among all GPUs, while the W7900 sits at the 94th percentile, indicating that both are high-performing parts despite their contrasting benchmark profiles.

Where Each One Wins

The AMD Radeon PRO W6800 is the clear winner in OpenCL-based compute tasks. In the head-to-head Geekbench OpenCL test, the W6800 scores 121,808 against the W7900’s 84,379, a commanding 44.4% advantage. This suggests that for workloads leveraging OpenCL—often found in scientific simulation, data analytics, and certain rendering pipelines—the older RDNA 2.0 card is the superior choice. The W6800’s average benchmark score of 135,396 also places it 0.8% ahead of the AMD Radeon PRO V620 and 0.1% ahead of both the NVIDIA A10M and NVIDIA RTX 4000 Ada Generation, showing it competes favorably against its immediate rivals in overall performance.

Conversely, the AMD Radeon PRO W7900 wins in Vulkan-based applications, which are increasingly common in real-time rendering, game development, and cross-platform graphics workloads. In the head-to-head Geekbench Vulkan test, the W7900 scores 137,070 versus the W6800’s 109,961, a 19.8% margin in favor of the newer card. The W7900’s average score of 110,725 places it 1% ahead of the AMD Radeon Pro Vega II and 3.2% ahead of the AMD Radeon Pro W6600X, though it trails the NVIDIA RTX A5500 Mobile by 2.8% and the NVIDIA Tesla V100 SXM2 16 GB by 3.2%. The W7900’s wins are therefore concentrated in Vulkan, where its architectural advancements yield tangible gains.

Architecture Differences

The two cards are built on fundamentally different architectures. The W6800 uses the Navi 21 chip with RDNA 2.0, fabricated on a 7 nm process at TSMC. It houses 26,800 million transistors on a 520 mm² die, resulting in a transistor density of 51.5 million per square millimeter. In contrast, the W7900 employs the Navi 31 chip with RDNA 3.0, codenamed Plum Bonito, manufactured on a more advanced 5 nm process, also at TSMC. The W7900 packs 57,700 million transistors on a slightly larger 529 mm² die, achieving a substantially higher transistor density of 109.1 million per square millimeter. This doubling of transistor density is a key architectural leap that underpins the W7900’s higher compute capabilities.

The memory subsystems also diverge. The W6800 features 32 GB of GDDR6 memory on a 256-bit bus, delivering 512.0 GB/s of bandwidth. The W7900 doubles the memory capacity to 48 GB, uses a wider 384-bit bus, and achieves 864.0 GB/s of bandwidth—a 68.75% increase in raw throughput. The W7900’s memory clock runs at 2250 MHz (18 Gbps effective), while the W6800’s memory operates at 2000 MHz (16 Gbps effective). These differences are critical for large dataset workloads, though the W6800’s OpenCL dominance suggests that raw bandwidth is not the sole determinant of compute performance.

Compute unit configurations differ markedly. The W6800 has 3,840 shading units, 240 texture mapping units, and 96 raster output pipelines, along with 60 ray tracing cores. The W7900 scales this up to 6,144 shading units, 384 TMUs, and 192 ROPs, with 96 ray tracing cores. This near-doubling of core counts is reflected in the W7900’s peak rates: 479.0 GPixel/s pixel rate and 958.1 GTexel/s texture rate, versus the W6800’s 222.9 GPixel/s and 557.3 GTexel/s. However, the FP32 compute figures tell a more nuanced story—the W7900 reaches 61.32 TFLOPS, while the W6800 manages 17.83 TFLOPS, a 3.44x difference that does not translate into OpenCL wins, likely due to driver and workload optimization differences.

Head-to-Head Benchmarks

The Geekbench OpenCL test is the W6800’s strongest showing. Its score of 121,808 eclipses the W7900’s 84,379 by 44.4%, a margin that cannot be dismissed as noise. This result is paradoxical given the W7900’s superior hardware specifications, but benchmark results indicate that the W6800’s RDNA 2.0 architecture is better optimized for this particular compute API. The W6800’s nearest rival, the AMD Radeon Pro W6800X Duo, scores 135,774, which is 0.3% higher than the W6800’s average, while the W6800 itself sits 0.1% above the NVIDIA A10M and RTX 4000 Ada Generation. These tight margins suggest the W6800 is well-positioned among its peers in OpenCL-oriented tasks.

In the Geekbench Vulkan test, the tables turn completely. The W7900 scores 137,070, beating the W6800’s 109,961 by 19.8%. The W7900’s Vulkan performance is its clear strength, and this result aligns with its architectural advantages in core count and memory bandwidth. The W7900’s average benchmark score, however, is dragged down by its relatively poor OpenCL showing, which is 44.4% lower than the W6800’s. This disparity between the two APIs is the defining characteristic of this comparison: the W6800 is a compute-first card with exceptional OpenCL throughput, while the W7900 excels in Vulkan-centric environments. The head-to-head tally is even at one win apiece, reflecting a genuine trade-off rather than a generational sweep.

Specification Differences

The most obvious specification gap is in memory. The W6800 offers 32 GB of GDDR6, while the W7900 provides 48 GB—a 50% capacity increase. Bandwidth jumps from 512.0 GB/s to 864.0 GB/s, and the bus width expands from 256-bit to 384-bit. The W7900’s memory clock is also higher at 2250 MHz versus 2000 MHz. These changes favor the W7900 for memory-intensive tasks like large-scale rendering or machine learning inference.

Clock speeds differ, with the W6800 running at a 1575 MHz base and 2322 MHz boost, while the W7900 operates at 1760 MHz base and 2495 MHz boost. The W7900’s higher clocks contribute to its superior pixel and texture rates. Power consumption scales accordingly: the W6800 has a 250 W TDP, while the W7900 draws 295 W. Both require a 600 W suggested PSU, but the W6800 uses a 1x 6-pin + 1x 8-pin connector setup, whereas the W7900 needs 2x 8-pin connectors. The W7900 is also physically larger, measuring 280 mm in length and 110 mm in height compared to the W6800’s 267 mm and 120 mm, and it occupies a triple-slot form factor versus the W6800’s dual-slot design.

Display outputs differ as well. The W6800 offers 6x mini-DisplayPort 1.4a, while the W7900 provides 3x DisplayPort 2.1 and 1x mini-DisplayPort 2.1. The W7900 supports the newer DisplayPort standard, which is relevant for high-refresh-rate or high-resolution displays. The W7900 uses the Navi 31 chip with the Plum Bonito codename, while the W6800 uses Navi 21 without a codename. The W7900’s FP16 performance is rated at 61.32 TFLOPS (1:1 ratio with FP32), whereas the W6800 achieves 35.67 TFLOPS FP16 (2:1 ratio), indicating different compute precision strategies. The W6800 is end-of-life, while the W7900 remains active in production.

FAQ

Q: Which card has higher raw compute throughput?

A: The AMD Radeon PRO W7900 has a significantly higher FP32 rating of 61.32 TFLOPS compared to the W6800’s 17.83 TFLOPS. Its FP16 rating is also higher at 61.32 TFLOPS (1:1) versus 35.67 TFLOPS (2:1) on the W6800.

Q: Why does the W6800 win in OpenCL despite lower specs?

A: In the Geekbench OpenCL test, the W6800 scores 121,808 against the W7900’s 84,379, a 44.4% advantage. Benchmark results indicate that the W6800’s RDNA 2.0 architecture is better optimized for this API, despite the W7900 having more cores and higher clock speeds.

Q: What is the memory capacity difference?

A: The W6800 has 32 GB of GDDR6 memory on a 256-bit bus, while the W7900 has 48 GB of GDDR6 on a 384-bit bus. Memory bandwidth is 512.0 GB/s for the W6800 and 864.0 GB/s for the W7900.

Q: How do their percentiles compare?

A: The W6800 ranks in the 96th percentile among all GPUs, while the W7900 ranks in the 94th percentile. This indicates the W6800 is slightly better positioned relative to the entire GPU landscape, despite the W7900’s higher-end specifications.

Q: Are there differences in display outputs?

A: Yes, the W6800 offers 6x mini-DisplayPort 1.4a, while the W7900 provides 3x DisplayPort 2.1 and 1x mini-DisplayPort 2.1. The W7900 supports the newer DisplayPort 2.1 standard.

Q: What is the power connector requirement?

A: The W6800 uses a 1x 6-pin + 1x 8-pin configuration with a 250 W TDP, while the W7900 requires 2x 8-pin connectors and has a 295 W TDP. Both have a suggested PSU of 600 W.