AMD Radeon Pro W6600X vs NVIDIA L20 Comparison

Head-to-Head Benchmarks

The recorded benchmark data for these two accelerators does not contain a single shared workload. The NVIDIA L20 has results for Geekbench OpenCL and Geekbench Vulkan, while the AMD Radeon Pro W6600X has only a Geekbench Metal result. Direct comparison is therefore impossible through identical tests; instead, the analysis must rely on each card's average benchmark score and its position within the nearest rival groups.

The NVIDIA L20 produces an average benchmark score of 251,147. This places it in the 99th percentile of all GPUs in the database. Its nearest measured rivals show the L20 operating in a tightly contested upper tier: it is 11.6% ahead of the NVIDIA PG506-232, 14.2% ahead of the AMD Radeon PRO W7900D, 11.6% behind the NVIDIA L40, and 12.6% behind the NVIDIA RTX 6000 Ada Generation. The spread between the slowest and fastest cards in this group is roughly 30 percentage points, and the L20 sits squarely in the middle, clearly above the PG506-232 and W7900D while trailing the two Ada-based workstation flagships.

The AMD Radeon Pro W6600X records an average benchmark score of 107,342, which lands it in the 94th percentile. Its rival group is far tighter in absolute terms. It is 0.6% ahead of the AMD Radeon Pro Vega II Duo, 2.1% behind the AMD Radeon Pro Vega II, 3.1% behind the AMD Radeon PRO W7900, and 5.4% ahead of the NVIDIA Quadro RTX 6000. The entire cluster spans less than 9 percentage points, meaning the W6600X is effectively interchangeable with its nearest competitors in aggregate performance.

The magnitude of the gap between the two cards is substantial. The L20's average score of 251,147 is more than double the W6600X's 107,342. In percentile terms, the difference between the 99th and 94th percentile is meaningful, but the percentile alone understates how far apart these products are in raw compute throughput. The L20 is competing against the fastest workstation accelerators in the database, while the W6600X is clustered with older Vega-based professional cards and a single high-end RDNA 3 part.

Architecture Differences

The two accelerators come from different architectural generations and are built on different process nodes. The NVIDIA L20 uses the AD102 chip, based on the Ada Lovelace architecture, fabricated by TSMC on a 5 nm node. It contains 76,300 million transistors on a 609 mm² die, for a transistor density of 125.3 million per square millimeter. The AMD Radeon Pro W6600X uses the Navi 23 chip, based on RDNA 2.0, also fabricated by TSMC but on a 7 nm node. It contains 11,060 million transistors on a 237 mm² die, for a density of 46.7 million per square millimeter. The L20 therefore packs nearly seven times as many transistors onto a die roughly two and a half times the area, and its density advantage is substantial.

The compute resources differ by an even wider margin. The L20 has 11,776 shading units, 368 texture mapping units, 128 ROPs, 92 ray tracing cores, and 368 tensor cores. The W6600X has 2,048 shading units, 128 TMUs, 64 ROPs, and 32 ray tracing cores, with no tensor cores listed. The L20's FP32 throughput is 59.35 TFLOPS, while the W6600X delivers 10.15 TFLOPS. In FP16, the L20 maintains 59.35 TFLOPS with a 1:1 ratio, whereas the W6600X reaches 20.31 TFLOPS through a 2:1 ratio. The L20's FP16 advantage is still nearly threefold despite the W6600X's doubled rate.

Memory configuration is another major divider. The L20 ships with 48 GB of GDDR6 on a 384-bit bus, providing 864.0 GB/s of bandwidth at an effective 18 Gbps. The W6600X has 8 GB of GDDR6 on a 128-bit bus, producing 256.0 GB/s at 16 Gbps effective. The L20 offers six times the capacity and more than three times the bandwidth. Clock behavior is one area where the W6600X is competitive on paper: its base clock of 2068 MHz exceeds the L20's 1440 MHz, and its boost clock of 2479 MHz is close to the L20's 2520 MHz. However, the vast difference in execution resources means the clock advantage does little to close the compute gap.

Pixel and texture rates follow the same pattern. The L20 records 322.6 GPixel/s and 927.4 GTexel/s. The W6600X records 158.7 GPixel/s and 317.3 GTexel/s. Power draw also diverges sharply: the L20 is rated at 275 W with a suggested 600 W power supply, while the W6600X draws 120 W with a suggested 300 W supply. The W6600X is an Apple MPX form factor card with no display outputs, whereas the L20 is a dual-slot PCIe 4.0 x16 card with four DisplayPort 1.4a outputs.

FAQ

Q: Which card has the higher average benchmark score?

A: The NVIDIA L20 records an average benchmark score of 251,147, compared to 107,342 for the AMD Radeon Pro W6600X.

Q: How does each card compare to its nearest rivals?

A: The L20 is 11.6% ahead of the NVIDIA PG506-232 and 14.2% ahead of the AMD Radeon PRO W7900D, while trailing the NVIDIA L40 by 11.6% and the NVIDIA RTX 6000 Ada Generation by 12.6%. The W6600X is 0.6% ahead of the AMD Radeon Pro Vega II Duo and 5.4% ahead of the NVIDIA Quadro RTX 6000, while sitting 2.1% behind the AMD Radeon Pro Vega II and 3.1% behind the AMD Radeon PRO W7900.

Q: What is the memory capacity difference?

A: The NVIDIA L20 has 48 GB of GDDR6 memory, while the AMD Radeon Pro W6600X has 8 GB of GDDR6 memory.

Q: Do both cards support the same graphics APIs?

A: Yes, both cards support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: Which card has more ray tracing cores?

A: The NVIDIA L20 has 92 ray tracing cores, while the AMD Radeon Pro W6600X has 32.

Q: What is the production status of each card?

A: The NVIDIA L20 is listed as Active, while the AMD Radeon Pro W6600X is listed as End-of-life.

Specification Differences

The following fields differ between the two accelerators:

• Architecture: Ada Lovelace (L20) versus RDNA 2.0 (W6600X)
• Process node: 5 nm (L20) versus 7 nm (W6600X)
• Transistors: 76,300 million (L20) versus 11,060 million (W6600X)
• Die size: 609 mm² (L20) versus 237 mm² (W6600X)
• Transistor density: 125.3M / mm² (L20) versus 46.7M / mm² (W6600X)
• Base clock: 1440 MHz (L20) versus 2068 MHz (W6600X)
• Boost clock: 2520 MHz (L20) versus 2479 MHz (W6600X)
• Memory clock: 2250 MHz, 18 Gbps effective (L20) versus 2000 MHz, 16 Gbps effective (W6600X)
• Memory size: 48 GB (L20) versus 8 GB (W6600X)
• Memory bus width: 384 bit (L20) versus 128 bit (W6600X)
• Memory bandwidth: 864.0 GB/s (L20) versus 256.0 GB/s (W6600X)
• Shading units: 11,776 (L20) versus 2,048 (W6600X)
• TMUs: 368 (L20) versus 128 (W6600X)
• ROPs: 128 (L20) versus 64 (W6600X)
• Ray tracing cores: 92 (L20) versus 32 (W6600X)
• Tensor cores: 368 (L20) versus none listed (W6600X)
• Pixel rate: 322.6 GPixel/s (L20) versus 158.7 GPixel/s (W6600X)
• Texture rate: 927.4 GTexel/s (L20) versus 317.3 GTexel/s (W6600X)
• FP32 performance: 59.35 TFLOPS (L20) versus 10.15 TFLOPS (W6600X)
• FP16 performance: 59.35 TFLOPS, 1:1 ratio (L20) versus 20.31 TFLOPS, 2:1 ratio (W6600X)
• TDP: 275 W (L20) versus 120 W (W6600X)
• Power connectors: 1x 16-pin (L20) versus none listed (W6600X)
• Suggested PSU: 600 W (L20) versus 300 W (W6600X)
• Bus interface: PCIe 4.0 x16 (L20) versus Apple MPX (W6600X)
• Display outputs: 4x DisplayPort 1.4a (L20) versus no outputs (W6600X)
• Dimensions: 267 mm length, 111 mm height (L20) versus not listed (W6600X)
• Production status: Active (L20) versus End-of-life (W6600X)
• Release date: 2023-11-15 (L20) versus 2021-08-02 (W6600X)
• Predecessor: Server Ampere (L20) versus none listed (W6600X)
• Successor: Server Hopper (L20) versus none listed (W6600X)
• Launch MSRP: none listed (L20) versus 699 USD (W6600X)
• Benchmark results: Geekbench OpenCL 274,276 and Geekbench Vulkan 228,018 (L20) versus Geekbench Metal 107,342 (W6600X)
• Percentile vs all GPUs: 99th (L20) versus 94th (W6600X)

The Verdict

The data supports a clear separation of roles. The NVIDIA L20 is a high-end server accelerator aimed at compute-heavy workloads that require large memory capacity and maximum throughput. Its 48 GB frame buffer, 864.0 GB/s bandwidth, and 59.35 TFLOPS FP32 rate place it in the top percentile of the database, and its nearest rivals are all premium workstation or server parts. The W6600X, by contrast, is an end-of-life Apple MPX card with 8 GB of memory, 256.0 GB/s bandwidth, and 10.15 TFLOPS FP32. Its rival cluster is tightly packed, and its 94th percentile placement reflects a competent but not exceptional professional GPU.

For users who need to run large models, render high-resolution scenes, or process data sets that exceed 8 GB, the L20 is the only choice between these two. The W6600X simply cannot address workloads that require its memory class or its compute scale. For users working within an Apple MPX ecosystem with modest memory requirements, the W6600X remains a functional option, but the data shows it delivers roughly 43% of the L20's average benchmark score (107,342 versus 251,147). That is not a close contest.

The L20 also benefits from being an active product with a successor listed (Server Hopper), while the W6600X is end-of-life with no successor recorded. The L20's tensor cores, 368 of them, provide hardware support for AI workloads that the W6600X lacks entirely.

Where Each One Wins

NVIDIA L20 wins on raw compute. Its FP32 output of 59.35 TFLOPS is nearly six times the W6600X's 10.15 TFLOPS. Its FP16 output of 59.35 TFLOPS at a 1:1 ratio is roughly three times the W6600X's 20.31 TFLOPS at a 2:1 ratio. Pixel rate (322.6 GPixel/s versus 158.7 GPixel/s) and texture rate (927.4 GTexel/s versus 317.3 GTexel/s) both favor the L20 by wide margins.

NVIDIA L20 wins on memory capacity and bandwidth. The 48 GB GDDR6 pool is six times the W6600X's 8 GB, and the 864.0 GB/s bandwidth is more than triple the W6600X's 256.0 GB/s. Any workload that requires large resident data sets, such as neural network training or large-scale rendering, will hit the W6600X's memory ceiling long before the L20.

NVIDIA L20 wins on feature set for compute. The presence of 368 tensor cores and 92 ray tracing cores, combined with PCIe 4.0 x16 connectivity and four DisplayPort 1.4a outputs, makes it a more flexible and capable accelerator for both headless compute and display-attached workstation tasks.

AMD Radeon Pro W6600X wins on power efficiency and form factor fit. Its 120 W TDP is less than half the L20's 275 W, and its suggested 300 W power supply is half the L20's 600 W requirement. For Mac Pro environments using the Apple MPX interface, the W6600X is the only one of the two that is designed to slot into that ecosystem, and its lack of display outputs reflects its role as a compute-only module within that system.

AMD Radeon Pro W6600X wins on clock speed on paper. Its base clock of 2068 MHz is substantially higher than the L20's 1440 MHz, and its boost clock of 2479 MHz nearly matches the L20's 2520 MHz. However, the L20's vastly larger execution resource pool means this clock advantage does not translate into higher throughput.

The W6600X also holds a narrow advantage within its own rival group. It sits 0.6% above the Radeon Pro Vega II Duo and 5.4% above the Quadro RTX 6000, showing that within its niche, it is not a laggard. But that niche is a different performance class entirely from the L20's tier.