AMD Radeon RX 6650M vs NVIDIA L4 Comparison

Where Each One Wins

The recorded data presents a clear split between these two GPUs, though it is not a balanced one. The NVIDIA L4 wins both head-to-head benchmark comparisons, taking the Geekbench OpenCL test with a score of 140838 against 65800, and the Vulkan test with 121306 against 77735. That gives the L4 two wins and the AMD Radeon RX 6650M zero wins in direct comparison.

However, the wins are not just about counting victories; the margins tell a more interesting story. In OpenCL, the L4 leads by 114%, more than doubling the AMD part's output. In Vulkan, the gap narrows considerably to 56.1%, though the L4 still holds a commanding advantage. This suggests the AMD Radeon RX 6650M is relatively stronger in compute-oriented workloads that leverage Vulkan's lower-level API access, while the NVIDIA part excels in OpenCL's more generalized compute paths.

Looking at the broader database context, the L4 sits at the 95th percentile among all GPUs tested, while the RX 6650M lands at the 91st percentile. Both are high-performing parts, but the percentile gap indicates the L4 belongs to a distinctly higher performance tier. The average benchmark score reinforces this: the L4 averages 131072 across its recorded tests, whereas the RX 6650M averages 71768. That is a substantial separation in overall capability.

For use-case segmentation, the data implies the NVIDIA L4 is better suited for compute-heavy server workloads where raw throughput and consistent performance across different API environments matter most. The AMD Radeon RX 6650M, being a mobile part (Navi Mobile generation) with end-of-life production status, appears positioned for portable systems where the lower absolute performance is acceptable given the form factor constraints. Neither part is a gaming-first product in the traditional sense, though both support DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4.

Architecture Differences

The architectural divide between these two GPUs is substantial. The NVIDIA L4 uses the AD104 chip built on Ada Lovelace architecture, fabricated on a 5 nm process at TSMC. The AMD Radeon RX 6650M uses the Navi 23 chip with RDNA 2.0 architecture, also fabricated at TSMC but on a larger 7 nm node. This process difference is significant: the L4 packs 35,800 million transistors into a 294 mm² die, yielding a transistor density of 121.8 million per square millimeter. The RX 6650M contains 11,060 million transistors on a 237 mm² die, with a density of only 46.7 million per square millimeter.

The L4's transistor budget enables a far larger execution engine. It has 7424 shading units, 240 texture mapping units, and 80 raster operation units. The RX 6650M counters with 1792 shading units, 112 TMUs, and 64 ROPs. The NVIDIA part also features 60 ray tracing cores and 240 tensor cores, while the AMD part has 28 ray tracing cores and no tensor cores listed in the database. This absence of tensor cores is notable: the L4's tensor hardware supports AI and machine learning workloads that the AMD part cannot accelerate through dedicated tensor hardware.

Memory architecture differs as well. The L4 carries 24 GB of GDDR6 on a 192-bit bus, delivering 300.1 GB/s of bandwidth. The RX 6650M has 8 GB of GDDR6 on a 128-bit bus, with 224.0 GB/s of bandwidth. The L4's memory clock runs at 1563 MHz (12.5 Gbps effective), while the AMD part runs at 1750 MHz (14 Gbps effective). The AMD chip's higher memory clock partially compensates for its narrower bus, but the L4's wider bus still wins on total bandwidth.

Clock behavior also diverges. The L4 has a base clock of 795 MHz and a boost clock of 2040 MHz. The RX 6650M runs much higher: 2068 MHz base, 2416 MHz boost, with a game clock of 2222 MHz. The AMD part relies on higher clock speeds to extract performance from its smaller architecture, while the L4 uses its massive shading unit count and tensor cores to achieve throughput.

The L4 is a server part (generation "Server Ada (Lxx)") with a 72 W TDP, single-slot form factor, and no display outputs. The RX 6650M is a mobile part (generation "Navi Mobile (RX 6000M)") with a 120 W TDP, integrated into the system (IGP slot width), and display outputs described as "Portable Device Dependent". The L4 uses a PCIe 4.0 x16 interface, while the AMD part uses PCIe 4.0 x8.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The NVIDIA L4 averages 131072 across its recorded benchmarks, compared to 71768 for the AMD Radeon RX 6650M. The L4's nearest rival, the NVIDIA GeForce RTX 3090 Ti, scores 131938, which is 0.7% higher than the L4.

Q: How do the two GPUs compare in the Vulkan benchmark?

A: The NVIDIA L4 scores 121306 in Geekbench Vulkan, while the AMD Radeon RX 6650M scores 77735. The L4 wins by 56.1%. This is a smaller margin than the OpenCL test, where the L4 leads by 114%.

Q: What are the memory capacity differences?

A: The NVIDIA L4 has 24 GB of GDDR6 memory on a 192-bit bus with 300.1 GB/s bandwidth. The AMD Radeon RX 6650M has 8 GB of GDDR6 on a 128-bit bus with 224.0 GB/s bandwidth. The L4 provides three times the capacity and 34% more bandwidth.

Q: Does the AMD Radeon RX 6650M have tensor cores?

A: No. The database lists tensor cores as null for the AMD part. The NVIDIA L4 includes 240 tensor cores, which are dedicated to AI and machine learning acceleration.

Q: Which GPU has a higher boost clock?

A: The AMD Radeon RX 6650M boosts to 2416 MHz, compared to the NVIDIA L4's 2040 MHz boost clock. The AMD part also has a higher base clock at 2068 MHz versus 795 MHz for the L4.

Q: How does the transistor count compare between the two chips?

A: The NVIDIA L4's AD104 chip contains 35,800 million transistors, while the AMD Radeon RX 6650M's Navi 23 chip contains 11,060 million. The L4 has over three times the transistor count on a die that is only 24% larger in area.

Specification Differences

The key specification differences between the two parts are substantial:

| Specification | NVIDIA L4 | AMD Radeon RX 6650M |

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

| Architecture | Ada Lovelace | RDNA 2.0 |

| Process node | 5 nm | 7 nm |

| Transistors | 35,800 million | 11,060 million |

| Die size | 294 mm² | 237 mm² |

| Base clock | 795 MHz | 2068 MHz |

| Boost clock | 2040 MHz | 2416 MHz |

| Game clock | None | 2222 MHz |

| Memory size | 24 GB | 8 GB |

| Memory bus | 192 bit | 128 bit |

| Memory bandwidth | 300.1 GB/s | 224.0 GB/s |

| Shading units | 7424 | 1792 |

| TMUs | 240 | 112 |

| ROPs | 80 | 64 |

| RT cores | 60 | 28 |

| Tensor cores | 240 | None |

| FP32 performance | 30.29 TFLOPS | 8.659 TFLOPS |

| FP16 performance | 30.29 TFLOPS (1:1) | 17.32 TFLOPS (2:1) |

| TDP | 72 W | 120 W |

| Bus interface | PCIe 4.0 x16 | PCIe 4.0 x8 |

| Display outputs | No outputs | Portable Device Dependent |

| Production status | Active | End-of-life |

The L4 also has a pixel rate of 163.2 GPixel/s versus 154.6 GPixel/s for the AMD part, and a texture rate of 489.6 GTexel/s versus 270.6 GTexel/s. The L4 uses no external power connectors and has a suggested PSU of 250 W; the AMD part also uses no external power connectors but has no suggested PSU listed.

Head-to-Head Benchmarks

The direct benchmark comparisons show the NVIDIA L4 winning both recorded tests. In Geekbench OpenCL, the L4 scores 140838 against the RX 6650M's 65800, a delta of 114%. This means the L4 delivers more than double the OpenCL compute performance of the AMD part. In Geekbench Vulkan, the L4 scores 121306 versus 77735, a delta of 56.1%. While still a decisive win, the Vulkan margin is roughly half the OpenCL margin, suggesting the AMD architecture handles Vulkan compute relatively more efficiently.

Context from the nearest rivals helps interpret these numbers. The L4's average score of 131072 places it just 0.7% behind the NVIDIA GeForce RTX 3090 Ti (131938) and 3.1% behind both the NVIDIA RTX 4000 Ada Generation (135218) and NVIDIA A10M (135230). It also trails the AMD Radeon PRO W6800 (135396) by 3.2%. These are all close margins, meaning the L4 sits in a tight performance cluster at the top of the database's GPU rankings.

The RX 6650M's average of 71768 puts it 0.5% behind the NVIDIA TITAN X Pascal (72098) and 0.8% behind the AMD Radeon Pro Vega 64 (72379). It edges out the AMD Radeon RX 6600 LE (70829) by 1.3% and trails the AMD Radeon Vega Frontier Edition (73370) by 2.2%. The AMD part's rivals are older-generation products, which underscores its position as a capable but not top-tier mobile GPU.

The FP32 compute figures reinforce the benchmark results. The L4 delivers 30.29 TFLOPS of FP32 performance, while the RX 6650M delivers 8.659 TFLOPS. That is a 3.5x advantage for the NVIDIA part in raw single-precision throughput. In FP16, the L4 sustains 30.29 TFLOPS at a 1:1 ratio, while the AMD part reaches 17.32 TFLOPS at a 2:1 ratio. The AMD part's FP16 advantage over its own FP32 is due to its packed math execution, but it still falls short of the L4's absolute FP16 output.

The Verdict

The data points to a straightforward conclusion: the NVIDIA L4 is the superior performer in every measured category. It wins both head-to-head benchmarks, delivers significantly higher FP32 and FP16 throughput, carries more memory with higher bandwidth, and includes tensor cores that the AMD part lacks. Its 95th percentile ranking versus the RX 6650M's 91st percentile confirms this hierarchy.

However, the choice is not purely about performance. The AMD Radeon RX 6650M is a mobile part with a 120 W TDP and end-of-life status, designed for portable systems where the L4's server-oriented single-slot form factor with no display outputs would be unusable. The L4 draws only 72 W, which is remarkably low for its performance level, but it requires a PCIe 4.0 x16 slot and external system support that mobile devices cannot provide.

For server and datacenter deployments where compute density and AI acceleration are priorities, the NVIDIA L4 is the clear pick. Its 24 GB memory capacity suits large models, its tensor cores accelerate AI workloads, and its 72 W TDP allows dense system configurations. The AMD Radeon RX 6650M, with its 8 GB memory, no tensor cores, and higher power draw, cannot match these capabilities.

For mobile gaming or portable compute systems, the AMD Radeon RX 6650M remains the only viable option of the two, simply because the L4 is not designed for that environment. Its higher clocks (2068 MHz base, 2416 MHz boost) and game clock of 2222 MHz indicate it can handle graphics workloads reasonably well within its power envelope. Buyers choosing between these two parts should base the decision on their platform requirements first and performance second, since the two GPUs serve mutually exclusive deployment scenarios.