NVIDIA GeForce RTX 4080 vs NVIDIA GeForce RTX 5090 Mobile Comparison

The desktop-class NVIDIA GeForce RTX 4080 and the mobile NVIDIA GeForce RTX 5090 Mobile are separated by more than just their form factor. The benchmark data shows a decisive overall victory for the older desktop card, which wins 9 out of 10 head-to-head tests, yet the mobile chip posts a notable win in one specific API test and offers significant advantages in memory capacity and power efficiency. The recorded scores reveal a 20.2% gap in average benchmark score, with the RTX 4080 averaging 54,247 points against the RTX 5090 Mobile's 45,152 points. The desktop card also holds an 86th percentile rank among all GPUs, compared to the mobile part's 84th percentile. This analysis breaks down the exact numbers, where each GPU wins, and who should choose which based strictly on the measured data.

Head-to-Head Benchmarks

The most lopsided result in the entire comparison comes from the Passmark GPU Compute test. The RTX 4080 scores 20,671, which is 54.2% ahead of the RTX 5090 Mobile's 13,401. This is the largest delta in any test and indicates a massive advantage in raw compute workloads such as rendering, physics simulation, or any task that leverages general-purpose GPU processing. The desktop part's higher boost clock of 2505 MHz versus 1515 MHz, combined with its larger FP32 throughput of 48.74 TFLOPS against 31.80 TFLOPS, explains this crushing lead.

In Geekbench Vulkan, the RTX 4080 again dominates, scoring 263,779 versus 198,405, a 32.9% advantage. This test stresses low-level graphics API performance, and the desktop card's superior texture rate of 761.5 GTexel/s versus 496.9 GTexel/s and pixel rate of 280.6 GPixel/s versus 169.7 GPixel/s are directly reflected in the score. The RTX 4080 also wins the Passmark G2D test by 17.2%, with 1,239 points against 1,057, showing that even 2D desktop workloads favor the higher-clocked desktop part.

The middle ground is occupied by several tests with wins between 11% and 17%. In Passmark G3D, the RTX 4080 scores 34,457 against 30,034, a 14.7% lead. The Passmark DirectX 11 test shows a 16.7% win for the desktop card (314 versus 269), while Passmark DirectX 9 gives the RTX 4080 a 14.2% edge (370 versus 324). The 3DMark Steel Nomad DX12 test, which is a modern gaming workload, shows the RTX 4080 ahead by 11.9%, scoring 6,567 versus 5,871. Even the Geekbench OpenCL compute test, which is less graphics-focused, favors the desktop card by 6.4% (214,739 versus 201,834). The Passmark DirectX 10 test shows an 11.5% win for the RTX 4080 (204 versus 183).

There is exactly one test where the RTX 5090 Mobile comes out on top: Passmark DirectX 12. The mobile chip scores 138 against the desktop's 132, a 4.3% win. This is a narrow margin, but it is a genuine reversal. The newer Blackwell 2.0 architecture, with its 82 RT cores and 328 tensor cores versus the Ada Lovelace part's 76 and 304 respectively, may contribute to this single test victory, even though the mobile part operates at far lower clocks. Aside from that one result, the RTX 4080 is consistently faster, often by a wide margin.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The RTX 4080 has a significantly higher average benchmark score of 54,247 points, compared to the RTX 5090 Mobile's 45,152 points.

Q: What is the biggest performance gap between the two cards?

A: The largest gap is in the Passmark GPU Compute test, where the RTX 4080 leads by 54.2%, scoring 20,671 versus the mobile chip's 13,401.

Q: Does the RTX 5090 Mobile win any benchmark at all?

A: Yes, it wins the Passmark DirectX 12 test, scoring 138 versus the RTX 4080's 132, a 4.3% advantage.

Q: How do the two cards compare in terms of memory bandwidth?

A: The RTX 5090 Mobile has a higher memory bandwidth of 896.0 GB/s using GDDR7 memory, while the RTX 4080 offers 716.8 GB/s with GDDR6X memory.

Q: What is the difference in power consumption?

A: The RTX 4080 has a TDP of 320 W, while the RTX 5090 Mobile is rated at just 95 W, making the mobile chip substantially more power-efficient on paper.

Q: Which card has better percentile ranking among all GPUs?

A: The RTX 4080 ranks in the 86th percentile, while the RTX 5090 Mobile ranks in the 84th percentile, showing the desktop card holds a slightly higher standing overall.

The Verdict

Based on the recorded data, the NVIDIA GeForce RTX 4080 is the clear choice for anyone who prioritizes raw performance and has the physical space and power budget for a desktop card. It wins 9 of 10 tests, with leads ranging from 4.3% to 54.2%. Its average score of 54,247 is 20.2% higher than the mobile part's 45,152, and it ranks two percentile points higher. For gaming, rendering, or compute tasks where maximum frame rates and shortest render times matter, the RTX 4080 is the superior hardware.

The RTX 5090 Mobile, however, is not without its merits. Its single win in Passmark DirectX 12 suggests that in specific modern API workloads, it can match or slightly exceed the desktop card. Its 24 GB of GDDR7 memory versus 16 GB of GDDR6X gives it a capacity advantage for large datasets or high-resolution texture packs. More importantly, its 95 W TDP against the desktop's 320 W means it delivers a substantial portion of the RTX 4080's performance at less than one-third of the power draw. For a laptop user who needs strong performance in a constrained thermal envelope, the RTX 5090 Mobile is a sensible pick, but the data does not support it as a faster overall GPU.

Specification Differences

The most obvious difference is in power and form factor. The RTX 4080 is a triple-slot desktop card with a 320 W TDP, a 700 W suggested PSU, and a 1x 16-pin power connector. The RTX 5090 Mobile is an IGP (integrated graphics processor) with a 95 W TDP, no power connectors, and no suggested PSU, designed to be soldered onto a laptop motherboard. The desktop card measures 310 mm in length, 140 mm in height, and 61 mm in width, while the mobile part has no listed dimensions.

Memory configurations also differ. The RTX 4080 uses 16 GB of GDDR6X on a 256-bit bus, providing 716.8 GB/s bandwidth. The RTX 5090 Mobile uses 24 GB of GDDR7 on the same 256-bit bus, but with higher bandwidth at 896.0 GB/s. The desktop card has a base clock of 2205 MHz and a boost of 2505 MHz, while the mobile chip runs much lower at 990 MHz base and 1515 MHz boost. The bus interface differs as well: the RTX 4080 uses PCIe 4.0 x16, while the RTX 5090 Mobile uses PCIe 5.0 x16. Display outputs are another split: the desktop card offers 1x HDMI 2.1 and 3x DisplayPort 1.4a, while the mobile part's outputs are listed as "Portable Device Dependent".

Architecture Differences

The RTX 4080 is built on the AD103 chip using the Ada Lovelace architecture, while the RTX 5090 Mobile uses the GB203 chip with the Blackwell 2.0 architecture. Both are manufactured on a 5 nm process at TSMC, and their transistor counts are nearly identical: 45,900 million for the desktop card and 45,600 million for the mobile chip. Die sizes are also close, at 379 mm² and 378 mm² respectively, with transistor densities of 121.1M / mm² versus 120.6M / mm².

Despite the similar silicon fundamentals, the internal configurations differ. The RTX 4080 has 9,728 shading units, 304 TMUs, and 112 ROPs. The RTX 5090 Mobile has more shading units at 10,496, more TMUs at 328, but the same 112 ROPs. The RTX 5090 Mobile also has more RT cores (82 versus 76) and more tensor cores (328 versus 304). However, the desktop card's much higher clocks give it a huge lead in fill rates: 280.6 GPixel/s versus 169.7 GPixel/s for pixels, and 761.5 GTexel/s versus 496.9 GTexel/s for textures. The FP32 and FP16 compute figures also favor the desktop card, at 48.74 TFLOPS versus 31.80 TFLOPS for both precision levels. Both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API compatibility is identical.

Where Each One Wins

The RTX 4080 wins in almost every measurable scenario. For high-refresh-rate gaming at 1440p or 4K, the 3DMark Steel Nomad DX12 score of 6,567 versus 5,871 indicates a solid 11.9% lead in modern game workloads. For legacy DirectX 9, 10, and 11 titles, it is ahead by 14.2%, 11.5%, and 16.7% respectively, making it the better choice for older game libraries. For compute-heavy tasks like video encoding, machine learning inference, or 3D rendering, the 54.2% lead in Passmark GPU Compute and the 32.9% lead in Geekbench Vulkan make the desktop card the obvious pick. Even for general 2D desktop usage, the Passmark G2D score of 1,239 versus 1,057 shows a 17.2% advantage.

The RTX 5090 Mobile wins in only one recorded benchmark: Passmark DirectX 12, where it scores 138 versus 132. This suggests that in specific modern DirectX 12 applications that are optimized for the newer Blackwell 2.0 architecture, the mobile chip can match or slightly outperform the desktop part. Additionally, its 24 GB of memory versus 16 GB means it can handle larger working sets, such as high-resolution textures or multi-model AI workloads, without running out of VRAM. For users who value portability and energy efficiency over raw speed, the 95 W TDP versus 320 W makes the mobile chip far easier to cool and power, which is a practical win for laptop builders. However, in terms of pure benchmark performance, the data shows the RTX 4080 is the winner in 9 out of 10 categories.