AMD Radeon RX 6650M XT vs NVIDIA L40S Comparison

Head-to-Head Benchmarks

The recorded database contains a single direct head-to-head benchmark result between these two GPUs: Geekbench OpenCL. The NVIDIA L40S posts a score of 330,727, while the AMD Radeon RX 6650M XT records 76,904. This translates to a delta of 330.1 percent, meaning the L40S outperforms the RX 6650M XT by a factor of roughly 4.3 in this compute-oriented workload. The win count stands at 1 for the L40S and 0 for the RX 6650M XT, so the head-to-head comparison is decisive in favor of the server-class part.

Context from the average benchmark scores reinforces the gap. The L40S carries an average benchmark score of 295,763 across all recorded tests, placing it in the 99th percentile of all GPUs in the database. The RX 6650M XT, by contrast, has an average score of 76,904 and sits in the 91st percentile. The percentile difference is notable: even though both are high performers relative to the broader GPU population, the L40S is near the very top of the entire database, while the RX 6650M XT is merely above average.

The L40S also outperforms its own nearest rivals in the database, which helps contextualize its OpenCL result. It sits 3 percent ahead of the NVIDIA RTX 6000 Ada Generation and 4.1 percent ahead of the NVIDIA L40. It trails the AMD Instinct MI300X by 7 percent and the NVIDIA H200 NVL by 11.7 percent. These comparisons show that the L40S is not an outlier in its class; it is simply at the upper end of a tightly clustered group of high-end accelerators.

For the RX 6650M XT, the nearest rivals reveal a different story. It is 1 percent behind the NVIDIA GeForce RTX 5090 D, 2.6 percent behind the AMD Radeon RX 6850M XT, 3.1 percent behind the NVIDIA Tesla P100 PCIe 12 GB, and 3.4 percent behind the NVIDIA Tesla P100 PCIe 16 GB. The RX 6650M XT is thus competitive with a range of desktop and datacenter cards from previous generations, but it is nowhere near the absolute performance tier occupied by the L40S.

The Verdict

The data points to a clear separation of roles. The NVIDIA L40S is a server-class accelerator built for compute-heavy workloads. Its OpenCL score of 330,727 is more than four times the RX 6650M XT's 76,904, and its 99th percentile standing places it among the fastest GPUs in the entire database. Anyone needing maximum compute throughput for large-scale tasks should choose the L40S.

The AMD Radeon RX 6650M XT is a mobile part, classified as an IGP (integrated graphics processor) in the database, with a 91st percentile rank. Its average score of 76,904 puts it in the same neighborhood as the RTX 5090 D and the RX 6850M XT, but it is not designed to compete with the L40S. The RX 6650M XT is for portable systems where power constraints and physical size matter more than raw compute dominance.

Strictly from the recorded data, the L40S wins the only direct benchmark comparison. There is no recorded test where the RX 6650M XT takes a victory. The verdict is therefore straightforward: the L40S is the superior performer in absolute terms, while the RX 6650M XT serves a fundamentally different market segment.

Architecture Differences

The two GPUs come from different architectural generations and design philosophies. The NVIDIA L40S is built on the Ada Lovelace architecture, using the AD102 chip, and belongs to the Server Ada generation. The AMD Radeon RX 6650M XT uses the RDNA 2.0 architecture with the Navi 23 chip, part of the Navi Mobile generation for the RX 6000M series.

Process technology differs substantially. The L40S is fabricated on a 5 nm process at TSMC, with 76,300 million transistors packed into a 609 mm² die. That yields a transistor density of 125.3 million per square millimeter. The RX 6650M XT uses a 7 nm process, also from TSMC, but contains only 11,060 million transistors on a 237 mm² die, giving a density of 46.7 million per square millimeter. The L40S is thus not only larger but also significantly denser in transistor packing.

Compute resources scale accordingly. The L40S has 18,176 shading units, 568 texture mapping units, and 192 ROPs. It also features 142 ray tracing cores and 568 tensor cores. The RX 6650M XT has 2,048 shading units, 128 TMUs, and 64 ROPs, with 32 ray tracing cores and no tensor cores listed. The L40S has roughly nine times the shading units and more than four times the ray tracing cores.

Memory architecture is another major divergence. The L40S uses 48 GB of GDDR6 memory on a 384-bit bus, delivering 864.0 GB/s of bandwidth. The RX 6650M XT has 8 GB of GDDR6 on a 128-bit bus, with 256.0 GB/s of bandwidth. The L40S offers six times the memory capacity and more than three times the bandwidth.

Clock speeds tell a different story. The RX 6650M XT has a higher base clock at 2068 MHz versus 1110 MHz for the L40S, and a game clock of 2162 MHz. The boost clocks are closer: 2416 MHz for the AMD part and 2520 MHz for the NVIDIA part. The L40S compensates for its lower base clock with far wider execution resources.

FAQ

Q: Which GPU has the higher OpenCL benchmark score?

A: The NVIDIA L40S scores 330,727 in Geekbench OpenCL, while the AMD Radeon RX 6650M XT scores 76,904. The L40S wins with a delta of 330.1 percent.

Q: How do these GPUs compare to their nearest rivals?

A: The L40S is 3 percent ahead of the RTX 6000 Ada Generation and 4.1 percent ahead of the L40, but 7 percent behind the AMD Instinct MI300X and 11.7 percent behind the NVIDIA H200 NVL. The RX 6650M XT is 1 percent behind the RTX 5090 D, 2.6 percent behind the RX 6850M XT, 3.1 percent behind the Tesla P100 PCIe 12 GB, and 3.4 percent behind the Tesla P100 PCIe 16 GB.

Q: What are the memory capacities and bandwidths?

A: The L40S has 48 GB of GDDR6 memory on a 384-bit bus with 864.0 GB/s bandwidth. The RX 6650M XT has 8 GB of GDDR6 on a 128-bit bus with 256.0 GB/s bandwidth.

Q: Do both GPUs support the same APIs?

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

Q: What are the power consumption figures?

A: The L40S has a TDP of 300 W and requires a 700 W suggested PSU. The RX 6650M XT has a TDP of 120 W and lists no suggested PSU.

Q: Which GPU has more shading units?

A: The L40S has 18,176 shading units, while the RX 6650M XT has 2,048. The L40S also has 568 tensor cores, which the RX 6650M XT lacks entirely.

Where Each One Wins

The NVIDIA L40S wins in every recorded direct benchmark category. Its single head-to-head result is a Geekbench OpenCL victory with a 330.1 percent delta. Beyond that, the L40S wins on raw compute metrics: FP32 performance of 91.61 TFLOPS versus 9.896 TFLOPS for the RX 6650M XT, and FP16 performance of 91.61 TFLOPS (1:1) versus 19.79 TFLOPS (2:1). The L40S also wins on pixel rate (483.8 GPixel/s versus 154.6 GPixel/s) and texture rate (1,431.4 GTexel/s versus 309.2 GTexel/s).

The AMD Radeon RX 6650M XT does not win any recorded benchmark, but it does hold advantages in specific specification areas. It has a higher base clock (2068 MHz versus 1110 MHz) and a higher game clock (2162 MHz, which the L40S does not list). It also consumes less power at 120 W versus 300 W, and it requires no power connectors, making it suitable for portable device integration. Its slot width is listed as IGP, meaning it occupies no expansion slot in the traditional sense.

For practical use cases, the L40S is the choice for datacenter compute, AI inference, and rendering workloads where massive memory capacity and throughput are essential. The RX 6650M XT is the choice for thin-and-light gaming laptops or mobile workstations where the 120 W power budget and IGP form factor are the primary constraints. The data does not support any scenario where the RX 6650M XT outperforms the L40S in raw performance, but it clearly wins on efficiency per watt in the mobile context.

Specification Differences

The following fields differ between the two GPUs:

• Chip: AD102 (NVIDIA) versus Navi 23 (AMD)
• Architecture: Ada Lovelace versus RDNA 2.0
• Generation: Server Ada (Lxx) versus Navi Mobile (RX 6000M)
• Process node: 5 nm versus 7 nm
• Transistors: 76,300 million versus 11,060 million
• Die size: 609 mm² versus 237 mm²
• Transistor density: 125.3M / mm² versus 46.7M / mm²
• Base clock: 1110 MHz versus 2068 MHz
• Boost clock: 2520 MHz versus 2416 MHz
• Game clock: not listed versus 2162 MHz
• Memory clock: 2250 MHz / 18 Gbps effective versus 2000 MHz / 16 Gbps effective
• Memory size: 48 GB versus 8 GB
• Memory bus width: 384 bit versus 128 bit
• Memory bandwidth: 864.0 GB/s versus 256.0 GB/s
• Shading units: 18,176 versus 2,048
• TMUs: 568 versus 128
• ROPs: 192 versus 64
• RT cores: 142 versus 32
• Tensor cores: 568 versus not listed
• Pixel rate: 483.8 GPixel/s versus 154.6 GPixel/s
• Texture rate: 1,431.4 GTexel/s versus 309.2 GTexel/s
• FP32 performance: 91.61 TFLOPS versus 9.896 TFLOPS
• FP16 performance: 91.61 TFLOPS (1:1) versus 19.79 TFLOPS (2:1)
• TDP: 300 W versus 120 W
• Slot width: Dual-slot versus IGP
• Power connectors: 1x 16-pin versus None
• Suggested PSU: 700 W versus not listed
• Bus interface: PCIe 4.0 x16 versus PCIe 4.0 x8
• Display outputs: 1x HDMI 2.1, 3x DisplayPort 1.4a versus Portable Device Dependent
• Dimensions: 267 mm length, 111 mm height versus not listed
• Release date: 2022-10-12 versus 2022-01-03
• Predecessor: Server Ampere versus Polaris Mobile
• Successor: Server Hopper versus not listed