AMD Radeon PRO W6600 vs NVIDIA L20 Comparison

Head-to-Head Benchmarks

The benchmark data presents a decisive picture: the NVIDIA L20 dominates the AMD Radeon PRO W6600 in every recorded compute test. In the Geekbench OpenCL workload, the L20 scores 274,276 against the W6600's 73,514, a margin of 273.1% in favor of the NVIDIA part. That is not a marginal lead, it is a generational gap in raw throughput. The Vulkan results repeat the pattern, with the L20 scoring 228,018 versus 78,428, translating to a 190.7% advantage. Across both tests, the L20 records 2 wins and the W6600 records 0 wins.

What makes the OpenCL result especially stark is what it implies for compute-heavy tasks. A score nearly four times higher suggests workloads like rendering, simulation, and machine learning inference will finish dramatically faster on the L20. The Vulkan test, which typically exercises graphics-centric pipelines, still shows the L20 at roughly three times the W6600's output. This is not a case of one card being tuned for one API and the other for a different one; the L20 simply overwhelms the W6600 in raw compute regardless of the interface.

The database's average benchmark score, which aggregates results across all tests, reinforces the gap. The L20 averages 251,147 across its submitted benchmarks, placing it in the 99th percentile of all GPUs. The W6600 averages 81,995, which lands it in the 92nd percentile. While both are above-average performers, the L20 operates in a different tier, sitting among the top 1% of all recorded GPUs. The W6600, by contrast, sits comfortably but not exceptionally high, roughly in line with older professional cards.

The nearest rivals for the L20 offer context for its placement. The L20 trails the NVIDIA RTX 6000 Ada Generation by 12.6% and the NVIDIA L40 by 11.6%. It leads the NVIDIA PG506-232 by 11.6% and the AMD Radeon PRO W7900D by 14.2%. This indicates the L20 is a high-end server part, but not the absolute flagship from NVIDIA; it sits slightly below the L40 and RTX 6000 Ada in the same family. For the W6600, its closest competitors are much closer in score: the AMD Radeon Pro Vega 64X trails by only 1.3%, the NVIDIA GeForce RTX 5090 is 2.7% behind, and the Tesla P100 variants are 3% to 3.3% behind. The W6600 is competitive within its immediate peer group, but that group is far removed from the L20's absolute performance.

FAQ

Q: Which GPU is faster in the Geekbench OpenCL test?

A: The NVIDIA L20 is significantly faster, scoring 274,276 compared to the AMD Radeon PRO W6600's 73,514, a difference of 273.1%.

Q: How does the L20 compare to its nearest rivals in average benchmark score?**

A: The L20's average score of 251,147 is 11.6% higher than the NVIDIA PG506-232 and 14.2% higher than the AMD Radeon PRO W7900D, but it is 11.6% lower than the NVIDIA L40 and 12.6% lower than the NVIDIA RTX 6000 Ada Generation.

Q: What is the performance difference in the Vulkan benchmark?**

A: The L20 scores 228,018 in Vulkan, while the W6600 scores 78,428, resulting in a 190.7% performance lead for the L20.

Q: Does the AMD Radeon PRO W6600 have any benchmark where it wins?**

A: No. In the recorded head-to-head data, the L20 wins both the OpenCL and Vulkan tests. The W6600 has no winning entries in the shared benchmark suite.

Q: Where does the W6600 sit relative to its own closest competitors?**

A: The W6600's average score of 81,995 is only 1.3% higher than the AMD Radeon Pro Vega 64X, 2.7% higher than the NVIDIA GeForce RTX 5090, and 3.3% higher than the NVIDIA Tesla P100 PCIe 12 GB.

Q: What is the percentile ranking for each card?**

A: The L20 is in the 99th percentile of all GPUs, while the W6600 is in the 92nd percentile. This shows the L20 is a top-tier performer, while the W6600 is in a high but not elite tier.

Architecture Differences

The two GPUs come from fundamentally different design philosophies and process technologies. The NVIDIA L20 is built on the Ada Lovelace architecture using the AD102 chip, fabricated on a 5 nm process at TSMC. It packs 76,300 million transistors onto a 609 mm² die, achieving a transistor density of 125.3 million per mm². The AMD Radeon PRO W6600 uses the RDNA 2.0 architecture with the Navi 23 chip, also from TSMC but on a larger 7 nm process. It has 11,060 million transistors on a 237 mm² die, with a density of 46.7 million per mm². The L20's more advanced node and larger die give it a massive transistor budget, which explains the raw compute advantage.

The compute pipeline is where the architectures diverge sharply. The L20 has 11,776 shading units, 368 texture mapping units, and 128 ROPs. It also includes 92 ray tracing cores and 368 tensor cores, the latter being essential for AI and deep learning workloads. The W6600 has 1,792 shading units, 112 TMUs, and 64 ROPs. It includes 28 ray units but has no tensor cores at all, meaning it cannot accelerate tensor-based operations that the L20 handles natively. The FP32 compute throughput reflects this: the L20 delivers 59.35 TFLOPS, while the W6600 delivers 9.247 TFLOPS. For FP16, the L20 maintains 59.35 TFLOPS at a 1:1 ratio, whereas the W6600 reaches 18.49 TFLOPS at a 2:1 ratio, meaning it has a separate, slower path for FP16.

Memory architecture is another major divider. The L20 comes with 48 GB of GDDR6 memory on a 384-bit bus, giving it a bandwidth of 864.0 GB/s. The W6600 has 8 GB of GDDR6 on a 128-bit bus, with bandwidth of 224.0 GB/s. The L20's memory capacity is six times larger, and its bandwidth is nearly four times higher. This matters for datasets that exceed the W6600's 8 GB limit, a common situation in large model inference, high-resolution rendering, or multi-scene simulation.

The ROP and texture rates follow the same pattern. The L20 achieves 322.6 GPixel/s and 927.4 GTexel/s. The W6600 achieves 165.1 GPixel/s and 289.0 GTexel/s. The L20 is roughly 2 times faster in pixel throughput and over 3 times faster in texture throughput. Clock speeds are closer, with the L20 boosting to 2520 MHz and the W6600 boosting to 2580 MHz, but the L20's wider and deeper architecture turns a similar clock into far more work per cycle. The L20's base clock is 1440 MHz, while the W6600's is 2331 MHz, but the L20's core count renders that base-clock disadvantage irrelevant.

The L20 uses a PCIe 4.0 x16 interface, while the W6600 uses PCIe 4.0 x8. The L20 is a dual-slot card that draws up to 275 W with a 600 W suggested PSU and a single 16-pin power connector. The W6600 is a single-slot card with 100 W TDP, a 300 W suggested PSU, and a 6-pin connector. Both output via 4x DisplayPort 1.4a, and both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The W6600 has a launch MSRP of 649 USD, while the L20 has no listed launch MSRP.

The Verdict

Based on the recorded data, the NVIDIA L20 is the superior performer in every test where both cards are measured. The OpenCL score of 274,276 versus 73,514 and the Vulkan score of 228,018 versus 78,428 leave no ambiguity. The L20 is not just ahead, it is in a different performance class, nearly 4 times faster in OpenCL and nearly 3 times faster in Vulkan. The average benchmark score of 251,147 for the L20 places it in the 99th percentile, while the W6600 sits at 81,995 in the 92nd percentile.

Who should pick the L20? The data points to users who need maximum compute throughput for data-heavy tasks, such as running large machine learning models, rendering complex scenes, or processing massive datasets in parallel. The 48 GB memory and 864.0 GB/s bandwidth make it suitable for workloads that will not fit in smaller memory pools. The presence of 368 tensor cores is a strong indicator this card is designed for workloads that can leverage tensor acceleration, even if the exact performance on those workloads is not measured here. Users in the market for a top-tier server GPU should consider the L20, especially given that it is the 99th percentile and only trailing the L40 and RTX 6000 Ada by around 12%.

Who should pick the W6600? On its own, the W6600 is a solid mid-range card. Its 92nd percentile ranking and an average score of 81,995 put it ahead of cards like the AMD Radeon Pro Vega 64X, NVIDIA GeForce RTX 5090, and NVIDIA Tesla P100 PCIe 12 GB by margins of 1.3% to 3.3%. It is a single-slot card with a 100 W TDP and a 300 W PSU, which makes it far easier to fit into a compact workstation or an environment with power constraints. For users who are working primarily with compute workloads that do not exceed 8 GB of VRAM, and who do not need the extreme throughput, the W6600 is a competent choice. However, it is listed as end-of-life in the database, whereas the L20 is listed as active, meaning the L20 will likely receive longer support. The decision is clear for raw performance: the L20 wins outright. The W6600 is only preferable if a user needs a small, low-power card and can accept 95% lower performance in OpenCL.

Specification Differences

| Specification | NVIDIA L20 | AMD Radeon PRO W6600 |

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

| Architecture | Ada Lovelace | RDNA 2.0 |

| Chip | AD102 | Navi 23 |

| Process Node | 5 nm | 7 nm |

| Transistors | 76,300 million | 11,060 million |

| Die Size | 609 mm² | 237 mm² |

| Transistor Density | 125.3M / mm² | 46.7M / mm² |

| Base Clock | 1440 MHz | 2331 MHz |

| Boost Clock | 2520 MHz | 2580 MHz |

| Memory Clock | 2250 MHz / 18 Gbps effective | 1750 MHz / 14 Gbps effective |

| Memory Size | 48 GB | 8 GB |

| Memory Bus | 384 bit | 128 bit |

| Memory Bandwidth | 864.0 GB/s | 224.0 GB/s |

| Shading Units | 11776 | 1792 |

| TMUs | 368 | 112 |

| ROPs | 128 | 64 |

| Ray Accelerators | 92 | 28 |

| Tensor Cores | 368 | None |

| Pixel Rate | 322.6 GPixel/s | 165.1 GPixel/s |

| Texture Rate | 927.4 GTexel/s | 289.0 GTexel/s |

| FP32 | 59.35 TFLOPS | 9.247 TFLOPS |

| FP16 | 59.35 TFLOPS (1:1) | 18.49 TFLOPS (2:1) |

| TDP | 275 W | 100 W |

| Slot Width | Dual-slot | Single-slot |

| Power Connectors | 1x 16-pin | 1x 6-pin |

| Suggested PSU | 600 W | 300 W |

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

| Dimensions (Length) | 267 mm (10.5 inches) | 241 mm (9.5 inches) |

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

| Release Date | 2023-11-15 | 2021-06-07 |

Where Each One Wins

The NVIDIA L20 wins in every scenario where raw compute power is the primary requirement. The Geekbench OpenCL and Vulkan tests both go to the L20 by huge margins, 273.1% and 190.7% respectively. Any workload that can scale across the L20's 11,776 shaders, 368 TMUs, and 128 ROPs will see massive gains. The 48 GB VRAM and 864.0 GB/s bandwidth make it the obvious choice for large model training, big data rendering, and multi-application compute farms. The 92 ray cores and 368 tensor cores suggest it is also better suited for ray-traced graphics and AI inference tasks, though the database does not test those directly. The L20 is the winner for any workload that needs to finish in the shortest time possible.

The AMD Radeon PRO W6600 does not win any performance benchmark in the data, but it has other advantages. Its single-slot design and 100 W TDP make it a better fit for space-constrained or power-limited systems. The 7 nm process and smaller die (237 mm²) mean it has a lower physical footprint, and the 6-pin power connector and 300 W PSU requirement are easier to satisfy in existing workstations. For users who are not running the compute-heavy tasks that the L20 excels at, and who only need moderate performance, the W6600 is a practical alternative. It also has a launch MSRP of 649 USD, which is a stated price, though the database does not provide a comparable MSRP for the L20. The W6600 is not a winner in any measured metric, but it is a sensible choice for environments where size and power draw are the primary constraints.