NVIDIA GeForce RTX 4090 Mobile vs NVIDIA RTX 5880 Ada Generation Comparison

The NVIDIA RTX 5880 Ada Generation and the NVIDIA GeForce RTX 4090 Mobile represent two distinct design philosophies within the Ada Lovelace architecture: one is a full-scale workstation behemoth, the other a power-constrained laptop flagship. The data shows a clear split in their strengths, with the desktop workstation dominating compute and OpenCL workloads while the mobile part wins in several legacy DirectX and 2D tests. Across eight head-to-head benchmarks, the RTX 5880 Ada takes 3 wins while the RTX 4090 Mobile takes 5, yet the magnitude of the workstation’s victories in key compute tasks is far more decisive.

Where Each One Wins

The RTX 5880 Ada Generation is the clear choice for raw compute throughput and modern API performance. Its most dominant showing is in the Geekbench OpenCL test, where it scores 326,898 against the mobile card’s 180,831, an 80.8% advantage. This is a massive gap that points to workloads like GPU-accelerated rendering, scientific simulation, and machine learning inference. The workstation also wins the Passmark GPU Compute test with a score of 14,208 versus 12,347, a 15.1% lead, further cementing its status as a compute-first part. Additionally, it edges out the mobile GPU in Passmark DirectX 9 with a score of 335 versus 310, an 8.1% win, suggesting better legacy geometry throughput in older titles or APIs.

The RTX 4090 Mobile, conversely, wins in several synthetic graphics and legacy DirectX tests. Its strongest win is in Passmark DirectX 12, where it scores 107 against the workstation’s 70, a 34.6% margin. This is a surprising result given the workstation’s superior hardware, but the data is clear. The mobile part also wins Passmark DirectX 11 (262 vs 228, a 13% lead) and DirectX 10 (173 vs 167, a 3.5% lead). The 4090 Mobile also takes the Passmark G2D test with a score of 984 versus 777, a 21% lead, indicating faster 2D desktop rendering. Finally, in the aggregate Passmark G3D test, the mobile card scores 27,212 against 25,096 for the workstation, a 7.8% win. This suggests that in a general 3D gaming or rendering workload, the mobile part is surprisingly competitive, despite its lower raw specifications.

Architecture Differences

Both GPUs are built on the same 5 nm process at TSMC and share the Ada Lovelace architecture, but they use different physical chips. The RTX 5880 Ada is based on the AD102 die, which contains 76,300 million transistors on a 609 mm² die. The RTX 4090 Mobile uses the smaller AD103 chip, with 45,900 million transistors on a 379 mm² die. This die size difference is the root of the performance disparity. The workstation’s larger chip allows for significantly more execution resources: 14,080 shading units versus 9,728, 440 texture mapping units versus 304, and 176 ROPs versus 112. The RTX 5880 also features 110 RT cores and 440 tensor cores, compared to 76 RT cores and 304 tensor cores on the mobile part.

The memory subsystem is another major architectural divergence. The RTX 5880 Ada is equipped with 48 GB of GDDR6 memory on a 384-bit bus, delivering a bandwidth of 864.0 GB/s. The RTX 4090 Mobile has 16 GB of GDDR6 on a 256-bit bus, with a bandwidth of 576.0 GB/s. This gives the workstation a 50% advantage in memory bandwidth, which is critical for large datasets and high-resolution textures. The transistor density is also slightly higher on the workstation (125.3M per mm² versus 121.1M), although both are remarkably dense for the process node. The mobile GPU’s lower power envelope of 120 W versus 285 W for the workstation is a key enabler of its existence in a laptop form factor, but it also explains why its clock speeds are lower.

Head-to-Head Benchmarks

The most significant head-to-head result is the Geekbench OpenCL test. The RTX 5880 Ada’s score of 326,898 is 80.8% higher than the RTX 4090 Mobile’s 180,831. This is the single largest delta in the comparison and speaks to the workstation’s ability to scale compute tasks across its 14,080 shading units and 440 tensor cores. In the Passmark GPU Compute test, the workstation wins again with 14,208 versus 12,347, a 15.1% advantage. This consistency in compute-heavy benchmarks is the RTX 5880’s primary value proposition.

The RTX 4090 Mobile’s biggest win is in Passmark DirectX 12, where it scores 107 versus 70, a 34.6% lead. This is a substantial margin, especially considering the workstation’s superior specifications. The mobile GPU also wins Passmark DirectX 11 by 13% (262 vs 228) and DirectX 10 by 3.5% (173 vs 167). These results suggest that the mobile part’s drivers or clock behavior are optimized for these specific API paths, or that the workstation’s massive compute resources are not fully utilized in these tests. The Passmark G2D test also favors the mobile GPU, with a score of 984 versus 777, a 21% lead. The Passmark G3D test, which aggregates many 3D workloads, shows the mobile part winning 27,212 to 25,096, a 7.8% margin. The only legacy API win for the workstation is in DirectX 9, where it scores 335 versus 310, an 8.1% lead.

Specification Differences

The two cards differ in nearly every measurable specification. The RTX 5880 Ada has a base clock of 975 MHz and a boost clock of 2460 MHz, while the RTX 4090 Mobile has a higher base clock of 1335 MHz but a lower boost clock of 1695 MHz. This reflects the mobile part’s ability to run at a higher idle frequency but a much lower maximum frequency due to thermal and power limits. The workstation’s memory is 48 GB of GDDR6, while the mobile card has 16 GB; both run at 2250 MHz (18 Gbps effective). The bus width is 384-bit versus 256-bit, yielding bandwidth of 864.0 GB/s versus 576.0 GB/s.

The shading unit count is 14,080 versus 9,728, TMUs are 440 versus 304, and ROPs are 176 versus 112. RT cores are 110 versus 76, and tensor cores are 440 versus 304. The pixel rate is 433.0 GPixel/s for the workstation versus 189.8 GPixel/s for the mobile card, and the texture rate is 1,082.4 GTexel/s versus 515.3 GTexel/s. FP32 and FP16 performance is 69.27 TFLOPS for the workstation versus 32.98 TFLOPS for the mobile part. The RTX 5880 Ada has a TDP of 285 W and requires a dual-slot cooler with a single 16-pin power connector and a 600 W recommended PSU. The RTX 4090 Mobile is an IGP (integrated graphics processor) with a 120 W TDP and no power connectors, as it is soldered to the laptop motherboard. The workstation has four DisplayPort 1.4a outputs, while the mobile card’s outputs are portable device dependent. The workstation is 267 mm long and 112 mm high, while the mobile part has no listed dimensions.

FAQ

Q: Which GPU is faster in raw compute performance?

A: The NVIDIA RTX 5880 Ada Generation is decisively faster. It wins the Geekbench OpenCL test with a score of 326,898 versus 180,831, an 80.8% lead, and also wins Passmark GPU Compute with 14,208 versus 12,347, a 15.1% advantage.

Q: Why does the RTX 4090 Mobile win in DirectX 12?

A: The RTX 4090 Mobile scores 107 in Passmark DirectX 12 versus the RTX 5880 Ada’s 70, a 34.6% lead. Despite the workstation’s higher raw specs, the mobile part’s driver and clock behavior appear better optimized for this specific API path in the benchmark data.

Q: What is the biggest specification gap between these two cards?

A: The memory capacity and bandwidth are the largest gaps. The RTX 5880 Ada has 48 GB of GDDR6 on a 384-bit bus with 864.0 GB/s of bandwidth, while the RTX 4090 Mobile has 16 GB on a 256-bit bus with 576.0 GB/s.

Q: How do their transistor counts compare?

A: The RTX 5880 Ada’s AD102 chip contains 76,300 million transistors on a 609 mm² die, while the RTX 4090 Mobile’s AD103 chip has 45,900 million transistors on a 379 mm² die. Both are built on the same 5 nm TSMC process.

Q: Is the RTX 4090 Mobile a better choice for general 3D graphics?

A: According to the Passmark G3D test, yes. The RTX 4090 Mobile scores 27,212 versus 25,096 for the RTX 5880 Ada, a 7.8% win. It also leads in DirectX 10, 11, and 12 tests, making it surprisingly competitive in synthetic 3D workloads.

Q: What are the power requirements for each card?

A: The RTX 5880 Ada has a TDP of 285 W, requires a dual-slot cooler, a single 16-pin power connector, and a 600 W suggested PSU. The RTX 4090 Mobile has a TDP of 120 W, is an IGP with no power connectors, and is dependent on the laptop’s cooling solution.