AMD Radeon PRO V620 vs NVIDIA L20 Comparison

The NVIDIA L20 and AMD Radeon PRO V620 are both dual-slot, PCIe 4.0 x16 server/workstation accelerators, but they target very different performance tiers. The L20 is a current-generation Ada Lovelace part built on TSMC’s 5 nm node, while the V620 is an end-of-life RDNA 2.0 part on a 7 nm process. Benchmark data shows the L20 holding a commanding lead in both OpenCL and Vulkan workloads, with an average score advantage of roughly 84%. This analysis breaks down where each card excels, what the architectural differences mean in practice, and which workloads favor which GPU.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The NVIDIA L20 scores 251,147 on average, while the AMD Radeon PRO V620 scores 136,472. That is an 84.1% difference in favor of the L20, placing it in the 99th percentile of all GPUs, versus the V620’s 96th percentile.

Q: How do the two compare in raw compute throughput?

A: The L20 delivers 59.35 TFLOPS of FP32 performance and 59.35 TFLOPS of FP16 (1:1 ratio). The V620 offers 20.28 TFLOPS FP32 and 40.55 TFLOPS FP16 (2:1 ratio). In FP32, the L20 is nearly 3x faster; in FP16, the L20 still holds a 46% advantage.

Q: Which card has more memory, and does it matter for the benchmarks?

A: The L20 has 48 GB of GDDR6 on a 384-bit bus with 864.0 GB/s bandwidth. The V620 has 32 GB on a 256-bit bus with 512.0 GB/s. The L20’s 68.75% higher memory capacity and 68.75% higher bandwidth likely contribute to its OpenCL lead of 113.3% over the V620.

Q: Are these cards comparable in physical size?

A: Both are 267 mm (10.5 inches) long and dual-slot. The L20 is 111 mm (4.4 inches) tall, while the V620 is 120 mm (4.7 inches) tall and 50 mm (2 inches) wide. The V620 is slightly taller and has a stated width, but both fit standard server chassis.

Q: What are the power requirements for each?

A: The L20 has a 275 W TDP with a single 16-pin connector and a suggested 600 W PSU. The V620 has a 300 W TDP with two 8-pin connectors and a suggested 700 W PSU. Despite being slower, the V620 draws more power.

Q: Which card has Tensor cores, and what does that imply?

A: The L20 has 368 Tensor cores; the V620 has none listed. This indicates the L20 is positioned for AI/ML inference workloads, while the V620’s feature set is limited to standard RDNA 2 compute and graphics.

Architecture Differences

The NVIDIA L20 is built on the AD102 chip using Ada Lovelace architecture, fabricated on TSMC’s 5 nm process. It packs 76,300 million transistors on a 609 mm² die, yielding a transistor density of 125.3M per mm². The V620 uses the Navi 21 chip with RDNA 2.0 architecture, on TSMC’s 7 nm node, with 26,800 million transistors on a 520 mm² die, for a density of 51.5M per mm². The L20’s newer node and denser design translate directly into higher clock-for-clock efficiency and more compute units.

The L20 has 11,776 shading units, 368 TMUs, 128 ROPs, 92 RT cores, and 368 Tensor cores. The V620 offers 4,608 shading units, 288 TMUs, 128 ROPs, and 72 RT cores, but no Tensor cores. The L20’s shading unit count is 2.56x higher, and its RT core count is 27.8% higher. The V620 compensates slightly with a higher base clock of 1825 MHz versus 1440 MHz, but the L20 boosts to 2520 MHz, which is 14.5% higher than the V620’s 2200 MHz boost.

Memory architecture differs substantially. The L20 uses a 384-bit bus with 48 GB of GDDR6 at 18 Gbps effective, achieving 864.0 GB/s. The V620 uses a 256-bit bus with 32 GB at 16 Gbps effective, for 512.0 GB/s. The L20’s bandwidth advantage is 68.75%, which is critical for memory-bound workloads like large model inference or high-resolution rendering.

Pixel and texture rates follow the same pattern: the L20 outputs 322.6 GPixel/s and 927.4 GTexel/s, while the V620 manages 281.6 GPixel/s and 633.6 GTexel/s. The L20 leads by 14.6% in pixel fill and 46.4% in texture fill. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API compatibility is identical.

The V620 has no display outputs, while the L20 has 4x DisplayPort 1.4a. This makes the L20 usable for headless rendering with occasional display connection, while the V620 is strictly a compute-only accelerator.

The Verdict

The data is unambiguous: the NVIDIA L20 wins every benchmark against the AMD Radeon PRO V620. In Geekbench OpenCL, the L20 scores 274,276 versus 128,580, a 113.3% lead. In Vulkan, the L20 scores 228,018 versus 144,364, a 57.9% lead. The L20’s average score of 251,147 places it 84.1% above the V620’s 136,472.

For buyers choosing between these two, the L20 is the pick for any workload where raw compute, memory bandwidth, or AI acceleration matters. Its nearest rivals are the NVIDIA L40 (-11.6%) and RTX 6000 Ada (-12.6%), meaning it sits just below the top tier of Ada server cards. The V620, by contrast, is competitive only with cards like the AMD Radeon Pro W6800X Duo (0.5% delta) and NVIDIA A10M (0.9% delta) — it is a mid-range part, not a flagship.

The V620’s only advantages are its lower TDP (300 W vs 275 W is actually higher, so no) — correction: the V620 draws more power. It has no winning category in the provided data. The L20 is faster, more memory-rich, more power-efficient per FLOP, and has a longer production runway (Active status versus End-of-life). The V620 should only be chosen if it is already owned or available at a steep discount, but on pure performance metrics, the L20 wins decisively.

Specification Differences

| Specification | NVIDIA L20 | AMD Radeon PRO V620 |

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

| Architecture | Ada Lovelace | RDNA 2.0 |

| Process Node | 5 nm | 7 nm |

| Transistors | 76,300 million | 26,800 million |

| Die Size | 609 mm² | 520 mm² |

| Transistor Density | 125.3M / mm² | 51.5M / mm² |

| Base Clock | 1440 MHz | 1825 MHz |

| Boost Clock | 2520 MHz | 2200 MHz |

| Memory Size | 48 GB | 32 GB |

| Memory Type | GDDR6 | GDDR6 |

| Memory Bus | 384 bit | 256 bit |

| Memory Clock | 2250 MHz (18 Gbps effective) | 2000 MHz (16 Gbps effective) |

| Memory Bandwidth | 864.0 GB/s | 512.0 GB/s |

| Shading Units | 11776 | 4608 |

| TMUs | 368 | 288 |

| ROPs | 128 | 128 |

| RT Cores | 92 | 72 |

| Tensor Cores | 368 | None |

| FP32 | 59.35 TFLOPS | 20.28 TFLOPS |

| FP16 | 59.35 TFLOPS (1:1) | 40.55 TFLOPS (2:1) |

| Pixel Rate | 322.6 GPixel/s | 281.6 GPixel/s |

| Texture Rate | 927.4 GTexel/s | 633.6 GTexel/s |

| TDP | 275 W | 300 W |

| Power Connectors | 1x 16-pin | 2x 8-pin |

| Suggested PSU | 600 W | 700 W |

| Display Outputs | 4x DisplayPort 1.4a | No outputs |

| Height | 111 mm (4.4 inches) | 120 mm (4.7 inches) |

| Width | Not specified | 50 mm (2 inches) |

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

| Release Date | 2023-11-15 | 2021-11-03 |

Head-to-Head Benchmarks

Two benchmark tests are available: Geekbench OpenCL and Geekbench Vulkan. The NVIDIA L20 wins both with substantial margins.

Geekbench OpenCL: The L20 scores 274,276 versus the V620’s 128,580. This is a 113.3% delta, meaning the L20 is more than twice as fast. The OpenCL test typically stresses raw compute throughput and memory bandwidth, which aligns with the L20’s 2.56x more shading units and 68.75% higher memory bandwidth. The V620’s higher base clock (1825 MHz) does not compensate for its lower core count and narrower memory bus.

Geekbench Vulkan: The L20 scores 228,018 versus the V620’s 144,364, a 57.9% delta. The margin is smaller than in OpenCL, suggesting the Vulkan test is more sensitive to driver scheduling or geometry throughput. The L20’s pixel rate (322.6 GPixel/s) and texture rate (927.4 GTexel/s) are both higher, contributing to the win, but the V620’s RDNA 2 architecture handles certain draw calls efficiently enough to keep the gap under 60%.

Overall, the L20 wins both tests, giving it a 2-0 record in direct comparison. The average benchmark score (251,147 vs 136,472) reflects a 84.1% overall advantage. For context, the L20’s nearest rival below it is the NVIDIA PG506-232 at 225,124 (11.6% lower), while the V620’s nearest rival is the AMD Radeon Pro W6800X Duo at 135,774 (0.5% higher) — meaning the V620 is essentially at parity with its closest peers, but the L20 is in a different performance class entirely.

Where Each One Wins

NVIDIA L20 wins: Every benchmark in the data set. The L20 is the clear choice for compute-heavy workloads including FP32 simulation, FP16 machine learning inference, and any task that benefits from 48 GB of memory. The 368 Tensor cores give it a dedicated hardware path for AI workloads, which the V620 lacks entirely. The 1:1 FP16 ratio (59.35 TFLOPS) means the L20 does not sacrifice precision for speed in mixed-precision training or inference. Its 864.0 GB/s bandwidth is ideal for large dataset processing, and the active production status ensures long-term availability and driver support. The L20 also has display outputs, making it usable in hybrid render/compute setups where the V620 cannot drive a monitor.

AMD Radeon PRO V620 wins: Nothing in the provided benchmark data. The V620’s sole technical advantages are a higher base clock (1825 MHz vs 1440 MHz) and a slightly lower transistor count on a larger die, but these do not translate into any performance wins. The V620’s FP16 throughput of 40.55 TFLOPS (2:1 ratio) is notable for a card in its class, but it is still 46% below the L20’s FP16 output. The 72 RT cores provide some ray tracing capability, but with fewer cores and lower fill rates than the L20, it would lose in RT workloads as well. The V620’s end-of-life status is a significant drawback for new deployments. It is a reasonable choice only if the workload is specifically optimized for RDNA 2 and cannot run on NVIDIA hardware, but the data shows no scenario where the V620 outperforms the L20. For anyone building a new system, the L20 is the only rational pick between these two.