NVIDIA GeForce RTX 4080 Mobile vs NVIDIA N1X 40SM Comparison

The Verdict

The data presents a stark contrast: the NVIDIA GeForce RTX 4080 Mobile is a fully realized, actively benchmarked mobile graphics processor, while the NVIDIA N1X 40SM is a specification sheet with no recorded performance data. The RTX 4080 Mobile holds a percentile rank of 81 among all GPUs, with an average benchmark score of 38135 across nine tests. The N1X 40SM, by contrast, has an average benchmark score of 0, a percentile rank of 50, and an empty benchmark array. For any user seeking a discrete GPU for a laptop, the RTX 4080 Mobile is the only option with measurable evidence of performance. The N1X 40SM, based on the recorded data, is an unproven entity with no wins in any head-to-head comparison.

Architecture Differences

The two GPUs belong to entirely different architectural generations and design philosophies. The RTX 4080 Mobile uses the AD104 chip, built on the Ada Lovelace architecture, and is part of the GeForce 40-series. The N1X 40SM uses the GB20B chip, built on the Blackwell 2.0 architecture, and is designated as part of a Blackwell IGP (N1x) generation. Both are fabricated by TSMC on a 5 nm process, but the similarities end there. The RTX 4080 Mobile integrates 35,800 million transistors on a 294 mm² die, yielding a transistor density of 121.8 million per square millimeter. The N1X 40SM has a larger die at 382 mm², but its transistor count is listed as unknown, and no density figure is provided.

The memory subsystems diverge sharply. The RTX 4080 Mobile uses 12 GB of GDDR6 memory on a 192-bit bus, with a memory clock of 2250 MHz (18 Gbps effective), producing a bandwidth of 432.0 GB/s. The N1X 40SM uses 128 GB of LPDDR5X memory on a 256-bit bus, with a memory clock of 1067 MHz (8.5 Gbps effective), yielding a lower bandwidth of 273.2 GB/s despite the larger frame buffer. The bus interface also differs: the RTX 4080 Mobile uses PCIe 4.0 x16, while the N1X 40SM uses PCIe 5.0 x16.

Compute resources favor the RTX 4080 Mobile in shading and ray tracing. It has 7424 shading units, 232 TMUs, 80 ROPs, 58 RT cores, and 232 tensor cores. The N1X 40SM has 5120 shading units, 320 TMUs, only 40 ROPs, 40 RT cores, and 160 tensor cores. The N1X 40SM counters with a higher texture rate of 750.7 GTexel/s versus 386.3 GTexel/s for the RTX 4080 Mobile, but its pixel rate is lower at 93.84 GPixel/s versus 133.2 GPixel/s.

Clock speeds also differ substantially. The RTX 4080 Mobile has a base clock of 1290 MHz and a boost clock of 1665 MHz. The N1X 40SM has a much lower base clock of 741 MHz but a significantly higher boost clock of 2346 MHz. Both deliver similar FP32 and FP16 compute: the RTX 4080 Mobile achieves 24.72 TFLOPS, while the N1X 40SM achieves 24.02 TFLOPS, a difference of 0.70 TFLOPS.

The RTX 4080 Mobile is a fully supported discrete GPU with DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 APIs. The N1X 40SM lists N/A for DirectX, OpenGL, and Vulkan, indicating no software API support in the recorded data. The RTX 4080 Mobile has a TDP of 110 W, while the N1X 40SM's TDP is unknown. Both are IGP-class in slot width, use no power connectors, and depend on portable device outputs; the N1X 40SM lists 1x HDMI as its display output.

Where Each One Wins

The RTX 4080 Mobile wins in every measurable category because the N1X 40SM has no benchmark scores. Across the nine recorded tests, the RTX 4080 Mobile delivers results that place it in the 81st percentile of all GPUs. Its strongest outcome is in Passmark G3D, where it scores 24926, and its weakest is in Passmark DirectX 12, where it scores 96. The N1X 40SM cannot be compared on any test, as its benchmark array is empty and its average score is zero.

The N1X 40SM does hold theoretical advantages in specific hardware specifications. Its 128 GB of LPDDR5X memory dwarfs the RTX 4080 Mobile's 12 GB, making it potentially more suited for workloads requiring massive memory capacity. Its texture rate of 750.7 GTexel/s is nearly double that of the RTX 4080 Mobile, and its 320 TMUs outnumber the RTX 4080 Mobile's 232. Its boost clock of 2346 MHz is also higher. However, none of these advantages are validated by performance data, so they remain theoretical only.

FAQ

Q: Which GPU has a higher average benchmark score?

A: The NVIDIA GeForce RTX 4080 Mobile has an average benchmark score of 38135. The NVIDIA N1X 40SM has an average benchmark score of 0, with no benchmark tests recorded.

Q: What is the memory capacity of each GPU?

A: The RTX 4080 Mobile has 12 GB of GDDR6 memory. The N1X 40SM has 128 GB of LPDDR5X memory.

Q: Which GPU has more shading units?

A: The RTX 4080 Mobile has 7424 shading units. The N1X 40SM has 5120 shading units.

Q: What are the FP32 performance figures for both GPUs?

A: The RTX 4080 Mobile delivers 24.72 TFLOPS FP32. The N1X 40SM delivers 24.02 TFLOPS FP32.

Q: Does the N1X 40SM support DirectX 12 Ultimate?

A: No. The recorded data lists the N1X 40SM's DirectX support as N/A. The RTX 4080 Mobile supports DirectX 12 Ultimate (12_2).

Q: What is the pixel rate difference between the two?

A: The RTX 4080 Mobile has a pixel rate of 133.2 GPixel/s. The N1X 40SM has a pixel rate of 93.84 GPixel/s.

Head-to-Head Benchmarks

There are no recorded head-to-head benchmarks between the RTX 4080 Mobile and the N1X 40SM. The head-to-head array is empty, and the wins count for both is zero. The only comparative data available comes from the RTX 4080 Mobile's own benchmark scores and its nearest rivals list, which does not include the N1X 40SM.

The RTX 4080 Mobile's benchmark results provide a baseline for understanding its performance tier. In Geekbench OpenCL, it scores 159575, and in Geekbench Vulkan, it scores 145807. Its Passmark scores vary by API generation: DirectX 10 at 157, DirectX 11 at 244, DirectX 12 at 96, and DirectX 9 at 286. The 2D score is 929, the 3D score is 24926, and the GPU compute score is 11191. These figures place the RTX 4080 Mobile at 1.3% ahead of the NVIDIA GeForce RTX 4070 and the NVIDIA Tesla P4, both with an average score of 37648 and 37628 respectively, and 0.4% behind the NVIDIA GeForce MX570 at 38299 and 0.6% behind the NVIDIA GeForce RTX 5080 Mobile at 38349.

The N1X 40SM's absence from the benchmark database means no direct comparisons can be drawn. Its theoretical specifications, such as 24.02 TFLOPS FP32, are close to the RTX 4080 Mobile's 24.72 TFLOPS, but without test scores, the data cannot confirm any performance equivalence. The RTX 4080 Mobile's 81st percentile rank is the only concrete performance metric available in this comparison.

Specification Differences

The two GPUs differ in nearly every recorded specification field. The RTX 4080 Mobile uses the AD104 chip with Ada Lovelace architecture, while the N1X 40SM uses the GB20B chip with Blackwell 2.0 architecture. The RTX 4080 Mobile's die size is 294 mm², while the N1X 40SM's is 382 mm². Transistor count is 35,800 million for the RTX 4080 Mobile and unknown for the N1X 40SM; transistor density is 121.8 million per square millimeter for the RTX 4080 Mobile and null for the N1X 40SM.

Clock speeds differ: the RTX 4080 Mobile runs at 1290 MHz base and 1665 MHz boost, while the N1X 40SM runs at 741 MHz base and 2346 MHz boost. Memory configurations are distinct: the RTX 4080 Mobile has 12 GB GDDR6 at 2250 MHz (18 Gbps effective) on a 192-bit bus with 432.0 GB/s bandwidth; the N1X 40SM has 128 GB LPDDR5X at 1067 MHz (8.5 Gbps effective) on a 256-bit bus with 273.2 GB/s bandwidth.

Compute unit counts vary: the RTX 4080 Mobile has 7424 shading units, 232 TMUs, 80 ROPs, 58 RT cores, and 232 tensor cores; the N1X 40SM has 5120 shading units, 320 TMUs, 40 ROPs, 40 RT cores, and 160 tensor cores. Pixel rates are 133.2 GPixel/s for the RTX 4080 Mobile versus 93.84 GPixel/s for the N1X 40SM. Texture rates are 386.3 GTexel/s for the RTX 4080 Mobile versus 750.7 GTexel/s for the N1X 40SM. FP32 and FP16 are both 24.72 TFLOPS for the RTX 4080 Mobile and 24.02 TFLOPS for the N1X 40SM.

Power and interface specs also diverge: the RTX 4080 Mobile has a TDP of 110 W, while the N1X 40SM's TDP is unknown. The RTX 4080 Mobile uses PCIe 4.0 x16, while the N1X 40SM uses PCIe 5.0 x16. Display outputs are portable device dependent for the RTX 4080 Mobile and 1x HDMI for the N1X 40SM. API support is complete for the RTX 4080 Mobile (DirectX 12 Ultimate, OpenGL 4.6, Vulkan 1.4) and N/A for the N1X 40SM. The RTX 4080 Mobile's release date is January 2, 2023, while the N1X 40SM's is May 31, 2026. The RTX 4080 Mobile is part of the GeForce 40-series with a predecessor in GeForce 30 Mobile and a successor in GeForce 50 Mobile; the N1X 40SM has no listed predecessor or successor.