GPU Comparison

# NVIDIA L4 vs AMD Radeon Pro W6600X

The NVIDIA L4 and AMD Radeon Pro W6600X occupy different corners of the professional GPU landscape, with the L4 built on Ada Lovelace architecture for server deployments and the W6600X designed as a RDNA 2.0 part for Apple MPX systems. The benchmark data reveals a clear performance gap: the L4 averages 131,072 across its tested workloads while the W6600X averages 107,342, placing them at the 95th and 94th percentiles of all GPUs respectively. That narrow percentile difference masks a substantial raw performance disparity—the L4 outperforms the W6600X by roughly 22% in average benchmark scores—yet the two cards serve fundamentally different ecosystems, and the data suggests the W6600X remains competitive within its niche despite its lower absolute numbers.

The Verdict

The data points to the NVIDIA L4 as the stronger performer overall, with its 140,838 Geekbench OpenCL score and 121,306 Vulkan score dwarfing the W6600X’s single recorded 107,342 Metal score. For compute-heavy server workloads, the L4 is the clear choice—it delivers 30.29 TFLOPS FP32 performance compared to the W6600X’s 10.15 TFLOPS, a threefold advantage that shows in every benchmark category. The L4 also offers 24 GB of GDDR6 memory versus 8 GB, triple the capacity, and its 300.1 GB/s bandwidth exceeds the W6600X’s 256.0 GB/s. However, the W6600X was designed for Apple MPX systems, and its Metal benchmark score of 107,342 is the only data point available for that API—the L4 has no Metal results in the fact pack, meaning direct API-level comparison is impossible. The W6600X’s 94th percentile ranking versus the L4’s 95th shows both cards sit near the top of the GPU hierarchy, but the L4’s lead in raw compute and memory capacity makes it the superior choice for general-purpose acceleration. The W6600X remains viable for its specific Mac-oriented use case, but the data shows no scenario where it outpaces the L4 in raw performance.

Where Each One Wins

The L4 wins decisively in raw compute throughput. Its FP32 performance of 30.29 TFLOPS is exactly three times the W6600X’s 10.15 TFLOPS, and its FP16 output matches FP32 at 30.29 TFLOPS (1:1 ratio), whereas the W6600X achieves 20.31 TFLOPS FP16 via a 2:1 ratio. This means the L4 handles both single-precision and half-precision workloads with equal vigor, while the W6600X trades precision for speed in FP16. The L4’s texture rate of 489.6 GTexel/s versus 317.3 GTexel/s and pixel rate of 163.2 GPixel/s versus 158.7 GPixel/s further cement its lead in rendering-adjacent tasks. The L4 also wins on memory capacity and bandwidth—24 GB at 300.1 GB/s versus 8 GB at 256.0 GB/s—which directly impacts large dataset handling in AI inference or rendering workloads.

The W6600X, however, wins on clock speed. Its base clock of 2068 MHz and boost of 2479 MHz exceed the L4’s 795 MHz base and 2040 MHz boost, reflecting the different design philosophies: the L4 prioritizes efficiency with a 72 W TDP, while the W6600X runs hotter at 120 W. The W6600X also has a narrower but faster memory clock at 2000 MHz (16 Gbps effective) versus the L4’s 1563 MHz (12.5 Gbps effective), though the L4 compensates with a wider 192-bit bus versus 128-bit. The W6600X’s FP16 performance of 20.31 TFLOPS, while lower than the L4’s 30.29 TFLOPS, represents a 2:1 ratio over its FP32, making it potentially better suited for workloads that leverage half-precision math with the right software stack.

Architecture Differences

The NVIDIA L4 uses the AD104 chip built on a 5 nm process at TSMC, housing 35,800 million transistors on a 294 mm² die with a transistor density of 121.8 million per mm². The AMD Radeon Pro W6600X uses the Navi 23 chip on a 7 nm process, also at TSMC, with 11,060 million transistors on a 237 mm² die and a density of 46.7 million per mm². This density disparity—the L4 packs roughly 2.6 times more transistors per square millimeter—explains the L4’s massive compute advantage despite its lower clocks.

The L4 features 7,424 shading units, 240 TMUs, 80 ROPs, 60 ray tracing cores, and 240 tensor cores. The W6600X counters with 2,048 shading units, 128 TMUs, 64 ROPs, and 32 ray tracing cores, but has no tensor cores listed. The L4’s tensor cores provide dedicated AI acceleration hardware that the W6600X lacks entirely, a critical differentiator for machine learning workloads. Both GPUs support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, and both have no display outputs, indicating their compute-focused design.

The L4 is a single-slot card with no power connectors, drawing just 72 W, while the W6600X is dual-slot with a 120 W TDP and requires a 300 W suggested PSU versus the L4’s 250 W. The L4 uses a standard PCIe 4.0 x16 interface, while the W6600X uses Apple MPX, limiting its host compatibility to Apple systems. The L4 is 169 mm long and 56 mm tall, while the W6600X dimensions are not provided. The L4 is currently Active in production, released in March 2023, while the W6600X is End-of-life, released in August 2021.

FAQ

Q: Which GPU has higher raw compute performance?

A: The NVIDIA L4 delivers 30.29 TFLOPS FP32, exactly three times the W6600X’s 10.15 TFLOPS. Its FP16 performance also leads at 30.29 TFLOPS (1:1) versus 20.31 TFLOPS (2:1).

Q: What memory configuration differences exist?

A: The L4 offers 24 GB GDDR6 on a 192-bit bus with 300.1 GB/s bandwidth. The W6600X provides 8 GB GDDR6 on a 128-bit bus with 256.0 GB/s bandwidth. The L4 triples capacity and adds 17% more bandwidth.

Q: Does the W6600X have any advantage in clock speeds?

A: Yes. The W6600X runs at 2068 MHz base and 2479 MHz boost, versus the L4’s 795 MHz base and 2040 MHz boost. Its memory clock is also higher at 2000 MHz (16 Gbps effective) versus 1563 MHz (12.5 Gbps effective).

Q: Which card supports AI workloads better?

A: The L4 includes 240 tensor cores specifically designed for AI acceleration. The W6600X has no tensor cores listed, meaning it lacks dedicated AI hardware and must rely on general-purpose shader compute.

Q: Are these cards compatible with the same systems?

A: No. The L4 uses PCIe 4.0 x16, a universal server interface, while the W6600X uses Apple MPX, which is proprietary to Apple systems. The W6600X’s interface restricts it to Mac environments.

Q: What is the production status of each card?

A: The NVIDIA L4 is listed as Active and was released in March 2023. The AMD Radeon Pro W6600X is End-of-life and was released in August 2021.

Head-to-Head Benchmarks

Direct head-to-head benchmark results are not available in the fact pack—the headToHeadBenchmarks field is empty, and no wins are recorded for either card. Instead, the available data comes from separate benchmark suites. The L4 achieved a Geekbench OpenCL score of 140,838 and a Geekbench Vulkan score of 121,306, while the W6600X achieved a Geekbench Metal score of 107,342. These different API tests cannot be directly compared, but the average benchmark scores provide a common metric: the L4 averages 131,072, while the W6600X averages 107,342. That 23,730-point gap represents a 22.1% advantage for the L4.

Looking at nearest rivals provides context. The L4 sits just 0.7% below the NVIDIA GeForce RTX 3090 Ti (131,938), 3.1% below the RTX 4000 Ada (135,218) and A10M (135,230), and 3.2% below the AMD Radeon PRO W6800 (135,396). The W6600X, meanwhile, sits 0.6% above the AMD Radeon Pro Vega II Duo (106,750) and 5.4% above the NVIDIA Quadro RTX 6000 (101,872), but 2.1% below the AMD Radeon Pro Vega II (109,617) and 3.1% below the AMD Radeon PRO W7900 (110,725). This positioning shows the L4 competing near the top of the stack, while the W6600X holds its own among established professional GPUs but cannot reach the L4’s tier.

The compute differences tell the story more dramatically. The L4’s 30.29 TFLOPS FP32 versus 10.15 TFLOPS represents a 200% advantage. Its texture rate of 489.6 GTexel/s versus 317.3 GTexel/s is 54% higher, and its pixel rate of 163.2 GPixel/s versus 158.7 GPixel/s is 2.8% higher. The L4 also has 60 ray tracing cores versus 32, and 240 tensor cores versus none. These disparities compound in real workloads, particularly those that leverage tensor cores or large memory pools.

Specification Differences

The two cards differ across nearly every specification category. The L4 uses a 5 nm process node versus the W6600X’s 7 nm, and its transistor count of 35,800 million dwarfs the W6600X’s 11,060 million. Die size also differs: 294 mm² versus 237 mm², with transistor density at 121.8 million per mm² versus 46.7 million per mm².

Clock speeds favor the W6600X: base 2068 MHz versus 795 MHz, boost 2479 MHz versus 2040 MHz, and memory 2000 MHz (16 Gbps effective) versus 1563 MHz (12.5 Gbps effective). Memory capacity and bandwidth favor the L4: 24 GB versus 8 GB, and 300.1 GB/s versus 256.0 GB/s, with bus widths of 192-bit versus 128-bit.

Compute resources heavily favor the L4: 7,424 shading units versus 2,048, 240 TMUs versus 128, 80 ROPs versus 64, 60 ray tracing cores versus 32, and 240 tensor cores versus none listed. The L4’s FP32 of 30.29 TFLOPS versus 10.15 TFLOPS and FP16 of 30.29 TFLOPS (1:1) versus 20.31 TFLOPS (2:1) reflect this resource gap. Pixel rates are close at 163.2 GPixel/s versus 158.7, but texture rates diverge at 489.6 GTexel/s versus 317.3.

Power and physical specs also differ: the L4 has a 72 W TDP versus 120 W, is single-slot versus dual-slot, has no power connectors versus unspecified connectors, and suggests a 250 W PSU versus 300 W. The L4 uses PCIe 4.0 x16, while the W6600X uses Apple MPX. The L4 measures 169 mm by 56 mm, while the W6600X has no listed dimensions. The L4 was released in March 2023 and is Active, while the W6600X was released in August 2021 and is End-of-life. The W6600X has a launch MSRP of 699 USD; the L4 has no listed launch MSRP.