NVIDIA GeForce RTX 4090 Mobile vs NVIDIA GeForce RTX 5080 Mobile Comparison

The Verdict

The data presents a close generational contest with a clear split in strengths. The NVIDIA GeForce RTX 4090 Mobile wins 5 of the 9 head-to-head benchmarks, while the RTX 5080 Mobile wins 4. The 4090 Mobile's victories are decisive in compute-oriented workloads, particularly OpenCL where it leads by 8.3% (180,831 vs 166,986). The 5080 Mobile's wins are narrower in most cases, with its largest margin being a 10.1% lead in the Passmark G2D test (1095 vs 984). However, the 4090 Mobile holds a higher average benchmark score of 43,667 compared to the 5080 Mobile's 38,349, and it sits at the 84th percentile of all GPUs versus the 81st for the newer part. For users prioritizing raw compute throughput, the 4090 Mobile is the data-backed choice. For those focused on 2D performance, specific DirectX 12 workloads, and a dramatically lower 80 W TDP, the 5080 Mobile presents a compelling alternative. The 5080 Mobile does not dethrone the 4090 Mobile as the overall performance leader in this dataset.

Architecture Differences

The two mobile GPUs represent distinct NVIDIA architectures built on the same process node. The RTX 4090 Mobile uses the AD103 chip based on Ada Lovelace architecture, fabricated on a 5 nm process at TSMC. It packs 45,900 million transistors on a 379 mm² die, yielding a transistor density of 121.1M / mm². In contrast, the RTX 5080 Mobile is powered by the GB203 chip built on Blackwell 2.0 architecture, also on TSMC's 5 nm node. It contains 45,600 million transistors on a slightly smaller 378 mm² die, with a density of 120.6M / mm². The transistor counts are nearly identical, with the 4090 Mobile holding a negligible lead of 300 million transistors.

The architectural divergence is most visible in the compute unit counts. The 4090 Mobile features 9,728 shading units, 304 TMUs, and 112 ROPs, while the 5080 Mobile contains 7,680 shading units, 240 TMUs, and 96 ROPs. The RT core and tensor core counts follow the same pattern: the 4090 Mobile has 76 RT cores and 304 tensor cores, whereas the 5080 Mobile has 60 RT cores and 240 tensor cores. This gives the Ada Lovelace part a 26.7% advantage in shading units, a 26.7% lead in TMUs, and a 16.7% lead in ROPs. The 5080 Mobile compensates with a different memory subsystem. Both use a 256-bit bus, but the 5080 Mobile employs GDDR7 memory running at 28 Gbps effective, producing 896.0 GB/s of bandwidth. The 4090 Mobile uses GDDR6 at 18 Gbps effective, yielding 576.0 GB/s. The 5080 Mobile's bandwidth advantage is 55.6% higher. Clock speeds are also notable: the 4090 Mobile has a higher base clock (1335 MHz vs 975 MHz) and boost clock (1695 MHz vs 1500 MHz), but the 5080 Mobile's Blackwell architecture delivers its wins through efficiency and memory bandwidth rather than raw clock speed. The 5080 Mobile's TDP is 80 W, a full 40 W lower than the 4090 Mobile's 120 W.

Head-to-Head Benchmarks

The OpenCL benchmark is the largest single gap between the two cards. The 4090 Mobile scores 180,831 against the 5080 Mobile's 166,986, a 8.3% delta in favor of the Ada Lovelace part. This aligns with the 4090 Mobile's 43.1% higher FP32 compute (32.98 TFLOPS vs 23.04 TFLOPS) and its larger shading unit count. The Vulkan test is far closer, with the 4090 Mobile winning 170,774 to 169,754, a margin of just 0.6%. That near-tie suggests the newer architecture's memory bandwidth helps close the gap in API-level workloads that are less compute-bound.

In DirectX legacy tests, the results split. The 4090 Mobile wins DirectX 10 (173 vs 171, +1.2%) and DirectX 11 (262 vs 253, +3.6%). The 5080 Mobile takes DirectX 12 (116 vs 107, +7.8%) and DirectX 9 (314 vs 310, +1.3%). The DirectX 12 result is particularly interesting: despite the 4090 Mobile's higher raw compute, the 5080 Mobile's GDDR7 bandwidth and Blackwell optimizations deliver a decisive win. The DirectX 9 and DirectX 10 scores are nearly identical, indicating that neither architecture has a substantial edge in older API paths.

The Passmark G2D test is the 5080 Mobile's strongest showing. Its score of 1095 beats the 4090 Mobile's 984 by 10.1%. This 2D performance gap is the largest delta percentage in either direction across all tests. The 3D test, Passmark G3D, goes to the 5080 Mobile by a slim 1.8% margin (27,711 vs 27,212). This result is notable because the 4090 Mobile has substantially more compute units, yet the 5080 Mobile still edges ahead in overall 3D rendering. Finally, the GPU compute test favors the 4090 Mobile at 12,347 vs 12,134, a 1.8% lead that reinforces its compute-oriented strength.

Specification Differences

The key specification differences between the two mobile GPUs are clear and consistent with their architectural split. The 4090 Mobile has a base clock of 1335 MHz and a boost clock of 1695 MHz, while the 5080 Mobile operates at 975 MHz base and 1500 MHz boost. The 4090 Mobile's memory is 16 GB of GDDR6 on a 256-bit bus, with a bandwidth of 576.0 GB/s. The 5080 Mobile also has 16 GB, but it is GDDR7 on the same 256-bit bus, providing 896.0 GB/s of bandwidth. The shading unit count is 9,728 on the 4090 Mobile versus 7,680 on the 5080 Mobile. TMUs are 304 vs 240, and ROPs are 112 vs 96. RT cores are 76 vs 60, and tensor cores are 304 vs 240. The pixel rate for the 4090 Mobile is 189.8 GPixel/s, while the 5080 Mobile achieves 144.0 GPixel/s. Texture rates are 515.3 GTexel/s for the 4090 Mobile and 360.0 GTexel/s for the 5080 Mobile. FP32 and FP16 performance are both 32.98 TFLOPS on the 4090 Mobile, while the 5080 Mobile delivers 23.04 TFLOPS in each. The TDP is 120 W for the 4090 Mobile and 80 W for the 5080 Mobile, a significant efficiency gap. The bus interface differs as well: the 4090 Mobile uses PCIe 4.0 x16, while the 5080 Mobile uses PCIe 5.0 x16. Both are IGP slot width with no power connectors, and both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The 4090 Mobile's release date is 2023-01-02, while the 5080 Mobile launched on 2025-04-01.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The NVIDIA GeForce RTX 4090 Mobile has the higher average benchmark score at 43,667, compared to the RTX 5080 Mobile's 38,349. The 4090 Mobile also holds a higher percentile rank at 84 versus 81 for the 5080 Mobile.

Q: Where does the RTX 5080 Mobile have its biggest advantage?

A: The RTX 5080 Mobile's largest win is in the Passmark G2D test, where it scores 1095 versus 984 for the 4090 Mobile, a 10.1% advantage. It also leads in DirectX 12 (116 vs 107, +7.8%) and DirectX 9 (314 vs 310, +1.3%).

Q: How does memory bandwidth differ between the two?

A: The RTX 5080 Mobile has 896.0 GB/s of bandwidth from its GDDR7 memory on a 256-bit bus. The RTX 4090 Mobile has 576.0 GB/s from GDDR6 on the same 256-bit bus. The 5080 Mobile's bandwidth is 55.6% higher.

Q: Why does the RTX 4090 Mobile win the OpenCL benchmark?

A: The 4090 Mobile scores 180,831 in OpenCL versus 166,986 for the 5080 Mobile, an 8.3% advantage. This correlates with its higher FP32 compute of 32.98 TFLOPS and its 9,728 shading units, compared to 23.04 TFLOPS and 7,680 shading units on the 5080 Mobile.

Q: Are these GPUs from the same generation?

A: No. The RTX 4090 Mobile is from the GeForce 40-series (Ada Lovelace architecture) and was released on 2023-01-02. The RTX 5080 Mobile is from the GeForce 50-series (Blackwell 2.0 architecture) and was released on 2025-04-01.

Q: What are the TDP differences between the two cards?

A: The RTX 4090 Mobile has a TDP of 120 W, while the RTX 5080 Mobile has a TDP of 80 W. The 5080 Mobile consumes 40 W less power, representing a 33.3% reduction in TDP.

Where Each One Wins

The RTX 4090 Mobile is the clear winner in compute-intensive scenarios. It leads in OpenCL by 8.3%, in Vulkan by 0.6%, in DirectX 11 by 3.6%, in DirectX 10 by 1.2%, and in GPU compute by 1.8%. Its higher shading unit count, greater RT and tensor core counts, and higher FP32 throughput make it the superior choice for general-purpose GPU compute, machine learning inference tasks that rely on tensor cores, and any workload that scales with raw shading power. The 4090 Mobile also posts a higher average benchmark score and a higher percentile rank, indicating it is the more capable overall GPU in this dataset.

The RTX 5080 Mobile wins where memory bandwidth and architectural efficiency matter more than raw compute. Its 896.0 GB/s bandwidth versus 576.0 GB/s gives it a 55.6% advantage in memory throughput, which directly contributes to its wins in DirectX 12 (+7.8%), DirectX 9 (+1.3%), Passmark G2D (+10.1%), and Passmark G3D (+1.8%). The 5080 Mobile is the better pick for 2D desktop workloads, applications that leverage DirectX 12's modern feature set, and scenarios where the 80 W TDP is a critical constraint. The G2D result is particularly decisive, suggesting the Blackwell architecture handles memory-bound 2D operations with significantly greater efficiency. The 5080 Mobile's PCIe 5.0 x16 interface also provides a generational upgrade over the 4090 Mobile's PCIe 4.0 x16, though the benchmark data does not quantify the real-world impact of this difference. In summary, the 4090 Mobile remains the performance leader for compute-heavy tasks, while the 5080 Mobile offers a more efficient package that wins in specific API and 2D workloads.