AMD Radeon RX 7900M vs NVIDIA L40 Comparison

Head-to-Head Benchmarks

The recorded data contains two directly comparable benchmark tests between the NVIDIA L40 and the AMD Radeon RX 7900M. The results are one-sided, with the NVIDIA L40 winning both tests by substantial margins.

In Geekbench OpenCL, the NVIDIA L40 scores 330,926 points against the AMD Radeon RX 7900M's 129,499 points. This gives the L40 a 155.5% advantage, meaning it delivers roughly two and a half times the compute throughput in this workload. The gap is enormous and reflects the fundamental difference in positioning between a server-grade accelerator and a mobile graphics solution.

The second test, Geekbench Vulkan, shows a narrower but still decisive lead for the L40. The NVIDIA card scores 237,295 points while the AMD card manages 158,760 points, a 49.5% difference. Vulkan is a lower-level API that can favor architectures with strong raw geometry throughput, but even here the L40's larger silicon and higher power envelope carry it clearly ahead.

Looking at the broader database picture, the NVIDIA L40 sits at the 99th percentile among all GPUs, with an average benchmark score of 284,111 across its recorded tests. Its nearest rivals in the database are the NVIDIA RTX 6000 Ada Generation at 287,237 (1.1% lower), the NVIDIA L40S at 295,763 (3.9% higher), the AMD Instinct MI300X at 317,994 (10.7% higher), and the NVIDIA L20 at 251,147 (13.1% lower). The L40 is clearly positioned in the top tier of professional accelerators.

The AMD Radeon RX 7900M, by contrast, sits at the 94th percentile with an average benchmark score of 97,487. Its nearest rivals include the AMD Radeon Pro VII at 97,131 (0.4% lower), the NVIDIA Quadro RTX 6000 at 101,872 (4.3% higher), the AMD Radeon Instinct MI60 at 92,466 (5.4% lower), and the NVIDIA RTX A4500 at 91,671 (6.3% lower). The 7900M is competitive among mobile and workstation parts but operates in a different performance class entirely from the L40.

Where Each One Wins

The data shows no benchmark wins for the AMD Radeon RX 7900M in the head-to-head comparison. The NVIDIA L40 takes both recorded tests, so the win count stands at 2 for NVIDIA and 0 for AMD.

That said, the use cases diverge sharply based on the specifications. The NVIDIA L40 is designed for server deployments. It draws 300 W, uses a dual-slot form factor with a 16-pin power connector, and requires a 700 W power supply. It has 48 GB of GDDR6 memory on a 384-bit bus, yielding 864.0 GB/s of bandwidth. This is a card built for large datasets, rendering farms, and compute clusters where density and throughput matter more than portability.

The AMD Radeon RX 7900M is a mobile part, listed as an integrated graphics processor (IGP) with no power connectors and no dedicated slot width. Its power draw is 180 W, which is high for a mobile GPU but still far below the L40's 300 W. It carries 16 GB of GDDR6 on a 256-bit bus, giving 576.0 GB/s of bandwidth. The display outputs are listed as "Portable Device Dependent," confirming its role inside laptops rather than standalone cards.

So the practical split is clear: the L40 wins wherever raw compute and memory capacity are the priority, such as AI training, scientific simulation, or high-end 3D rendering. The 7900M wins wherever power efficiency and physical size matter, such as high-performance laptops or compact mobile workstations. The benchmark data does not capture that second scenario, but the specifications make it obvious.

Architecture Differences

The two GPUs come from entirely different architectural lineages. The NVIDIA L40 uses the AD102 chip on the Ada Lovelace architecture, built on a 5 nm process at TSMC. It packs 76,300 million transistors onto a 609 mm² die, giving a transistor density of 125.3 million per square millimeter. The chip includes 18,176 shading units, 568 texture mapping units, 192 ROPs, 142 ray tracing cores, and 568 tensor cores.

The AMD Radeon RX 7900M uses the Navi 31 chip on the RDNA 3.0 architecture, codenamed Plum Bonito. It is also built on a 5 nm process at TSMC, but the die is smaller at 529 mm² and contains 57,700 million transistors, translating to 109.1 million per square millimeter. The chip has 4,608 shading units, 288 TMUs, 192 ROPs, and 72 ray tracing cores. Notably, it has no tensor cores listed in the database.

The compute characteristics differ in a telling way. The L40 delivers 90.52 TFLOPS of FP32 and the same 90.52 TFLOPS for FP16, indicating a 1:1 ratio where the hardware does not double-rate half-precision. The 7900M delivers 38.52 TFLOPS of FP32 but 77.05 TFLOPS of FP16, a 2:1 ratio that shows AMD's architecture handles half-precision at twice the rate of full precision. For workloads that use FP16, the AMD card is relatively stronger than its FP32 number suggests, though it still trails the L40 in absolute terms.

Feature support is comparable on paper. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The L40 uses PCIe 4.0 x16, and so does the 7900M. But the L40 has dedicated tensor cores for AI acceleration, a feature the AMD card lacks entirely. That makes the L40 the only one of the two suited for deep learning workloads that rely on tensor operations.

Specification Differences

The key specification differences between the two are stark and worth listing directly.

Memory capacity: the L40 has 48 GB of GDDR6, the 7900M has 16 GB. That is a 3x difference. Memory bus width: 384-bit versus 256-bit. Memory bandwidth: 864.0 GB/s versus 576.0 GB/s, a 50% advantage for the L40. Shading units: 18,176 versus 4,608. TMUs: 568 versus 288. ROPs are equal at 192 each. Ray tracing cores: 142 versus 72. Tensor cores: 568 on the L40, none on the 7900M.

Clock speeds also move in opposite directions. The L40 has a base clock of 735 MHz and a boost clock of 2490 MHz, which is an unusual spread that shows it is designed to idle low and spike high under load. The 7900M has a base clock of 1825 MHz and a boost of 2090 MHz, a much flatter curve that reflects a mobile part running closer to its sustained limit.

Pixel rate favors the L40 at 478.1 GPixel/s versus 401.3 GPixel/s. Texture rate is heavily in the L40's favor at 1,414.3 GTexel/s versus 601.9 GTexel/s. FP32 throughput is 90.52 TFLOPS versus 38.52 TFLOPS.

Power consumption is 300 W for the L40 and 180 W for the 7900M. The L40 is a dual-slot card with a 16-pin connector and a 700 W suggested PSU. The 7900M has no power connector listed, no slot width, and no suggested PSU, consistent with its mobile nature. The L40 measures 267 mm in length and 111 mm in height. The 7900M has no dimensions recorded.

Production status differs as well: the L40 is end-of-life, released on October 12, 2022, with the predecessor listed as Server Ampere and the successor as Server Hopper. The 7900M is active, released on October 18, 2023, with the predecessor listed as Polaris Mobile and no successor recorded.

FAQ

Q: Which GPU has more memory bandwidth?

A: The NVIDIA L40 has 864.0 GB/s from a 384-bit bus, while the AMD Radeon RX 7900M has 576.0 GB/s from a 256-bit bus. The L40 leads by 50%.

Q: Does the AMD Radeon RX 7900M have tensor cores?

A: No. The database lists no tensor cores for the 7900M. The NVIDIA L40 has 568 tensor cores, which gives it a hardware advantage for AI and machine learning workloads.

Q: What is the FP16 performance difference?

A: The L40 delivers 90.52 TFLOPS of FP16, while the 7900M delivers 77.05 TFLOPS. The L40 is about 17% higher, but the AMD card achieves its FP16 number at a 2:1 ratio versus FP32, while the L40 runs at 1:1.

Q: Which GPU is better for laptop integration?

A: The AMD Radeon RX 7900M. It is listed as an IGP with no power connectors, no slot width, and display outputs dependent on the portable device. The NVIDIA L40 is a dual-slot card with a 16-pin power connector and a 700 W PSU requirement.

Q: Are these GPUs from the same manufacturing process?

A: Yes. Both are built on a 5 nm process at TSMC. The L40 uses the AD102 chip, and the 7900M uses the Navi 31 chip.

Q: Which GPU has a higher average benchmark score?

A: The NVIDIA L40 averages 284,111 across its recorded tests, placing it at the 99th percentile. The AMD Radeon RX 7900M averages 97,487, placing it at the 94th percentile.

The Verdict

The data leaves no ambiguity about raw performance. The NVIDIA L40 is in a different league from the AMD Radeon RX 7900M. It wins both head-to-head tests, one by 155.5% and the other by 49.5%. It has triple the memory capacity, 50% more bandwidth, roughly 2.35x the FP32 throughput, and a massive lead in texture rate. It also carries tensor cores, which the AMD card lacks entirely.

Anyone selecting a GPU for server-side compute, AI inference, or rendering workloads that can use the full 48 GB frame buffer should choose the NVIDIA L40 without hesitation. The 99th percentile ranking and the proximity to the RTX 6000 Ada and L40S in the database confirm it sits at the top of the professional stack.

The AMD Radeon RX 7900M is not a competitor in that space. It is a mobile part, and the data reflects that. The 94th percentile ranking is respectable, and its nearest rivals are older workstation cards like the Quadro RTX 6000 and Radeon Pro VII. It wins no direct comparisons against the L40, but it also draws only 180 W, requires no external power connectors, and fits into a portable device. For a laptop that needs strong graphics and compute capability, the 7900M is a sensible choice.

The deciding factor is form factor and power. If the workload lives in a server rack or a desktop chassis with a 700 W PSU, the L40 is the obvious pick. If the workload must travel in a laptop, the 7900M is the only one of the two that physically fits. The benchmark gap is real and large, but it is also the gap between a stationary accelerator and a mobile one. Choose based on where the work happens, not just on the scoreboard.