NVIDIA GeForce RTX 4090 Mobile vs NVIDIA GeForce RTX 5080 Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive sweep for the NVIDIA GeForce RTX 5080 across all nine shared benchmark tests. The RTX 4090 Mobile does not win a single head-to-head comparison. The most lopsided result appears in Passmark GPU Compute, where the RTX 5080 scores 21,789 against 12,347 for the mobile part, a 76.5% advantage. This gap reflects a fundamental difference in sustained compute throughput between a desktop card with a 360 W envelope and a notebook GPU designed for a 120 W power budget.

Vulkan performance tells a similar story. The RTX 5080 posts 255,450 in Geekbench Vulkan versus 170,774 for the RTX 4090 Mobile, a 49.6% lead. OpenCL results are closer but still favor the desktop part: 235,901 versus 180,831, a 30.5% margin. These compute-oriented tests highlight the architectural and power-class separation between the two products.

In DirectX workloads, the RTX 5080 leads by margins ranging from 20.2% to 41.1%. The smallest delta appears in Passmark DirectX 10, where the RTX 5080 scores 208 against 173. DirectX 12 shows a larger gap: 151 versus 107, a 41.1% difference. DirectX 11 lands in between at 23.7% (324 versus 262), while DirectX 9 results show a 25.5% advantage (389 versus 310). Across these legacy and modern API tests, the desktop card consistently outperforms the mobile part by roughly one-fifth to two-fifths.

The 2D and 3D Passmark tests reinforce the pattern. Passmark G2D gives the RTX 5080 a 43.8% edge (1,415 versus 984), while Passmark G3D shows a 34.4% lead (36,565 versus 27,212). The G3D result is particularly telling because it represents a broad rasterization workload, where the RTX 5080's higher pixel rate of 293.1 GPixel/s and texture rate of 879.3 GTexel/s directly translate into measurable gains over the RTX 4090 Mobile's 189.8 GPixel/s and 515.3 GTexel/s.

Overall, the average benchmark score for the RTX 5080 sits at 56,083, placing it in the 87th percentile among all GPUs in the database. The RTX 4090 Mobile averages 43,667, which lands in the 84th percentile. The 28.4% difference in average scores between the two parts is consistent with the individual test deltas, confirming that this is not a case of one benchmark skewing the result but rather a uniform performance hierarchy.

Architecture Differences

Both chips are fabricated on a 5 nm process at TSMC, and their transistor counts are nearly identical: 45,600 million for the RTX 5080 and 45,900 million for the RTX 4090 Mobile. Die sizes are also close, with the RTX 5080 measuring 378 mm² and the RTX 4090 Mobile at 379 mm². The transistor densities work out to 120.6M per mm² and 121.1M per mm², respectively, meaning the physical silicon is essentially equivalent in scale.

The architectural split comes from the underlying designs. The RTX 5080 uses the GB203 chip built on Blackwell 2.0, while the RTX 4090 Mobile relies on the AD103 chip from Ada Lovelace. Blackwell 2.0 introduces a different execution layout, evidenced by the RTX 5080's 10,752 shading units, 336 texture mapping units, and 84 RT cores. The Ada Lovelace part fields 9,728 shading units, 304 TMUs, and 76 RT cores. Both have 112 ROPs, but the RTX 5080 adds 336 tensor cores against 304 on the mobile chip. These counts give the RTX 5080 a 10.5% advantage in shading units and a 10.5% lead in TMUs, which scales directly into its higher fill rates.

Clock speeds create the largest architectural divergence. The RTX 5080 runs at a 2,295 MHz base and 2,617 MHz boost, while the RTX 4090 Mobile operates at 1,335 MHz base and 1,695 MHz boost. That is a 54% higher base clock and a 54% higher boost clock for the desktop part. Combined with the larger shader array, the RTX 5080 reaches 56.28 TFLOPS of FP32 throughput, versus 32.98 TFLOPS for the mobile GPU. FP16 performance matches the FP32 figures on both cards at a 1:1 ratio.

Memory architecture also differs. The RTX 5080 uses 16 GB of GDDR7 on a 256-bit bus, delivering 960.0 GB/s of bandwidth. The RTX 4090 Mobile has 16 GB of GDDR6 on the same 256-bit bus, but bandwidth drops to 576.0 GB/s. The GDDR7 memory runs at 1,875 MHz with 30 Gbps effective speed, while the GDDR6 operates at 2,250 MHz with 18 Gbps effective. The RTX 5080's memory bandwidth advantage of 66.7% is a major factor in its 3D and compute wins.

Power delivery and form factor separate the two even further. The RTX 5080 is a dual-slot desktop card with a 360 W TDP, a single 16-pin power connector, and a suggested 750 W PSU. The RTX 4090 Mobile is an integrated graphics processor with a 120 W TDP, no power connectors, and no PSU recommendation. The RTX 5080 uses PCIe 5.0 x16, while the mobile part uses PCIe 4.0 x16. Display outputs also differ: the RTX 5080 provides 1x HDMI 2.1b and 3x DisplayPort 2.1b, while the RTX 4090 Mobile's outputs are portable device dependent.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The NVIDIA GeForce RTX 5080 averages 56,083 across all recorded benchmarks, while the NVIDIA GeForce RTX 4090 Mobile averages 43,667.

Q: How much faster is the RTX 5080 in OpenCL compute?

A: The RTX 5080 scores 235,901 in Geekbench OpenCL versus 180,831 for the RTX 4090 Mobile, a 30.5% advantage.

Q: What is the memory bandwidth difference between the two cards?

A: The RTX 5080 provides 960.0 GB/s of bandwidth using 16 GB of GDDR7 on a 256-bit bus, while the RTX 4090 Mobile offers 576.0 GB/s using 16 GB of GDDR6 on the same bus width.

Q: Do both GPUs support the same DirectX feature level?

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

Q: Which card has more RT cores?

A: The RTX 5080 has 84 RT cores, while the RTX 4090 Mobile has 76 RT cores.

Q: What is the TDP of each GPU?

A: The RTX 5080 has a 360 W TDP, and the RTX 4090 Mobile has a 120 W TDP.

Specification Differences

The two GPUs diverge on nearly every measurable specification except memory capacity, bus width, ROP count, and API support. Both have 16 GB of memory on a 256-bit bus, both have 112 ROPs, and both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. Beyond those shared traits, the differences are substantial.

| Specification | RTX 5080 | RTX 4090 Mobile |

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

| Architecture | Blackwell 2.0 | Ada Lovelace |

| Chip | GB203 | AD103 |

| Process Node | 5 nm | 5 nm |

| Transistors | 45,600 million | 45,900 million |

| Die Size | 378 mm² | 379 mm² |

| Base Clock | 2,295 MHz | 1,335 MHz |

| Boost Clock | 2,617 MHz | 1,695 MHz |

| Memory Type | GDDR7 | GDDR6 |

| Memory Clock | 1,875 MHz (30 Gbps effective) | 2,250 MHz (18 Gbps effective) |

| Bandwidth | 960.0 GB/s | 576.0 GB/s |

| Shading Units | 10,752 | 9,728 |

| TMUs | 336 | 304 |

| RT Cores | 84 | 76 |

| Tensor Cores | 336 | 304 |

| Pixel Rate | 293.1 GPixel/s | 189.8 GPixel/s |

| Texture Rate | 879.3 GTexel/s | 515.3 GTexel/s |

| FP32 | 56.28 TFLOPS | 32.98 TFLOPS |

| FP16 | 56.28 TFLOPS (1:1) | 32.98 TFLOPS (1:1) |

| TDP | 360 W | 120 W |

| Slot Width | Dual-slot | IGP |

| Power Connectors | 1x 16-pin | None |

| Suggested PSU | 750 W | None |

| Bus Interface | PCIe 5.0 x16 | PCIe 4.0 x16 |

| Display Outputs | 1x HDMI 2.1b, 3x DisplayPort 2.1b | Portable Device Dependent |

| Dimensions | 304 mm x 137 mm x 40 mm | Not specified |

| Release Date | 2025-01-29 | 2023-01-02 |

| Launch MSRP | 999 USD | Not disclosed |

Where Each One Wins

The RTX 5080 wins every benchmark in the head-to-head comparison, so its use case is straightforward: any workload that can leverage the extra shader throughput, higher clock speeds, and doubled memory bandwidth will benefit. The 76.5% lead in Passmark GPU Compute makes it the clear choice for compute-heavy tasks such as rendering, simulation, or any GPGPU workload that scales with FP32 throughput. Its 960.0 GB/s of memory bandwidth is particularly valuable for large dataset transfers and texture-heavy scenes, where the RTX 4090 Mobile's 576.0 GB/s becomes a bottleneck.

The RTX 5080's 49.6% advantage in Vulkan and 30.5% lead in OpenCL further cement its position for cross-API compute and modern game engines that offload work to the GPU. The 34.4% margin in Passmark G3D suggests that even pure rasterization workloads, which are less bandwidth-sensitive than compute, still favor the desktop part substantially. With a 360 W TDP and dual-slot cooling, the RTX 5080 is best suited for desktop systems where power and physical space are not limiting factors.

The RTX 4090 Mobile, despite losing every benchmark, retains a distinct purpose. Its 120 W TDP and IGP form factor mean it can operate in laptops where the RTX 5080's 360 W requirement is physically impossible. The mobile part still delivers 32.98 TFLOPS of FP32 throughput and 576.0 GB/s of bandwidth, which is respectable for a notebook GPU. It holds the 84th percentile among all GPUs in the database, so it is not a weak part; it simply sits below the desktop flagship in absolute performance.

For users who need maximum performance in a stationary desktop, the RTX 5080 is the unambiguous choice. For users who require high-end gaming or compute in a portable chassis, the RTX 4090 Mobile is the only option between these two, and its 16 GB of GDDR6 memory still provides ample capacity for modern workloads even if bandwidth trails the desktop card. The data shows no scenario where the mobile GPU beats the desktop part, but the mobile part enables a class of systems that the desktop card cannot serve.