AMD Radeon RX 7900 XTX vs NVIDIA GeForce RTX 4090 Mobile Comparison

The data presents a clear hierarchy between the AMD Radeon RX 7900 XTX and the NVIDIA GeForce RTX 4090 Mobile, with the desktop flagship winning eight of nine head-to-head benchmark comparisons. The RX 7900 XTX holds an average benchmark score of 44019, placing it 0.8% ahead of the RTX 4090 Mobile’s 43667, a margin that positions both cards in the 85th percentile of all GPUs. While the numerical gap in average score is narrow, the distribution of wins across specific tests reveals substantial performance differences in compute and graphics workloads. The RTX 4090 Mobile, despite its lower power envelope and mobile form factor, manages to stay competitive in legacy DirectX 10 tests, but falls behind in nearly every other measure. This analysis walks through the architectural underpinnings of these two cards, identifies where each excels, and interprets the benchmark data to determine which user profile aligns with each product.

The Verdict — who should pick which, strictly from the data

Based on benchmark results, the AMD Radeon RX 7900 XTX is the superior choice for users prioritizing raw graphics performance and compute throughput. It wins eight of nine head-to-head tests, with its most dominant victories in Passmark GPU Compute (43.3% ahead), Passmark DirectX 11 (35.9% ahead), and Passmark G2D (28.8% ahead). The card’s average score of 44019 also edges out the RTX 4090 Mobile’s 43667, and it sits within 0.4% of the AMD Radeon Pro 580, which holds a 44195 average score. For desktop users with the power budget and physical space, the RX 7900 XTX delivers consistently higher frame rates and compute performance across modern APIs.

The NVIDIA GeForce RTX 4090 Mobile is the data-driven choice for users requiring a high-performance GPU in a portable, low-power package. Its 120 W TDP is less than one-third of the RX 7900 XTX’s 355 W, and it requires no power connectors, making it suitable for laptops where thermals and battery life matter. While it loses the overall benchmark war, it wins the Passmark DirectX 10 test (173 vs. 166, a 4% advantage), showing a niche strength in older API workloads. The RTX 4090 Mobile also carries an Active production status, whereas the RX 7900 XTX is End-of-life, suggesting longer availability for the mobile part. Users who need desktop-class performance in a mobile chassis should pick the RTX 4090 Mobile; those who need maximum performance regardless of power or size should pick the RX 7900 XTX.

Architecture Differences — node, cores, cache, features that differ

The two GPUs come from fundamentally different architectural lineages. The AMD Radeon RX 7900 XTX uses the Navi 31 chip built on RDNA 3.0 architecture, with the codename Plum Bonito, while the NVIDIA GeForce RTX 4090 Mobile uses the AD103 chip built on Ada Lovelace architecture. Both are manufactured on a 5 nm process at TSMC, but the RX 7900 XTX packs more transistors: 57,700 million across a 529 mm² die, versus 45,900 million on a 379 mm² die for the RTX 4090 Mobile. Interestingly, the RTX 4090 Mobile has a higher transistor density at 121.1M per mm², compared to 109.1M per mm² for the RX 7900 XTX, indicating NVIDIA’s more compact layout.

Core configurations differ significantly. The RX 7900 XTX features 6144 shading units, 384 TMUs, and 192 ROPs, while the RTX 4090 Mobile has 9728 shading units, 304 TMUs, and 112 ROPs. The AMD card has 96 ray tracing cores, while NVIDIA has 76 RT cores but also includes 304 tensor cores, which the AMD card lacks entirely. This tensor core presence gives the RTX 4090 Mobile dedicated hardware for AI workloads, though the benchmark data does not directly test this capability. The FP32 and FP16 throughput also diverges: the RX 7900 XTX delivers 61.39 TFLOPS FP32 and 122.8 TFLOPS FP16 (2:1 ratio), while the RTX 4090 Mobile provides 32.98 TFLOPS for both FP32 and FP16 (1:1 ratio), indicating AMD’s advantage in raw floating-point throughput.

Memory architecture differences are stark. The RX 7900 XTX offers 24 GB of GDDR6 on a 384-bit bus with 960.0 GB/s bandwidth, while the RTX 4090 Mobile has 16 GB of GDDR6 on a 256-bit bus with 576.0 GB/s bandwidth. The AMD card’s memory clock is 2500 MHz (20 Gbps effective) versus 2250 MHz (18 Gbps effective) for NVIDIA. Both support PCIe 4.0 x16, DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The RX 7900 XTX is a dual-slot card with 2x 8-pin power connectors and a 750 W suggested PSU, while the RTX 4090 Mobile is an IGP (integrated graphics processor) with no power connectors and no suggested PSU, reflecting their desktop versus mobile design intents.

Where Each One Wins — use-case split based on benchmark wins

The RX 7900 XTX dominates in compute-heavy and modern graphics workloads. Its largest victory comes in Passmark GPU Compute, where it scores 17689 versus 12347, a 43.3% advantage that indicates strong performance in general-purpose GPU tasks like rendering, simulation, or scientific computing. In Passmark DirectX 11, the AMD card leads 356 to 262, a 35.9% margin, suggesting better performance in games and applications that rely on this widely-used API. The Passmark G2D test shows a 28.8% lead (1267 vs. 984), pointing to superior 2D graphics and desktop compositing performance. For DirectX 12 workloads, the RX 7900 XTX wins 131 to 107, a 22.4% edge, which is relevant for modern games and VR applications.

The RTX 4090 Mobile wins only one test: Passmark DirectX 10, scoring 173 versus 166, a 4% advantage. This suggests a slight edge in older DirectX 10 games or applications that have not been updated to newer API versions. The mobile card also benefits from its 304 tensor cores, which the RX 7900 XTX lacks, potentially giving it an advantage in AI-accelerated tasks like DLSS or machine learning inference, though no benchmark in the data directly measures this. For users on battery power or in thermally constrained environments, the RTX 4090 Mobile’s 120 W TDP versus 355 W for the AMD card makes it the practical choice for sustained mobile use, even if it loses on pure performance.

FAQ

Q: Which GPU has the higher average benchmark score?

A: The AMD Radeon RX 7900 XTX has an average benchmark score of 44019, which is 0.8% higher than the NVIDIA GeForce RTX 4090 Mobile’s 43667.

Q: In which test does the RTX 4090 Mobile outperform the RX 7900 XTX?

A: The RTX 4090 Mobile wins the Passmark DirectX 10 test, scoring 173 compared to 166 for the RX 7900 XTX, a 4% advantage.

Q: How much larger is the RX 7900 XTX’s memory bandwidth?

A: The RX 7900 XTX has 960.0 GB/s bandwidth, which is significantly higher than the RTX 4090 Mobile’s 576.0 GB/s, representing a 66.7% advantage for the AMD card.

Q: What is the power consumption difference between the two cards?

A: The RX 7900 XTX has a TDP of 355 W, while the RTX 4090 Mobile has a TDP of 120 W, making the NVIDIA card consume about 66% less power.

Q: Does the RTX 4090 Mobile have tensor cores that the RX 7900 XTX lacks?

A: Yes, the RTX 4090 Mobile includes 304 tensor cores, while the RX 7900 XTX has no tensor cores listed in its specifications.

Q: Which card has more shading units?

A: The RTX 4090 Mobile has 9728 shading units, which is 3584 more than the RX 7900 XTX’s 6144 shading units.

Head-to-Head Benchmarks

The largest victory for the AMD Radeon RX 7900 XTX comes in the Passmark GPU Compute test, where it scores 17689 against 12347 for the RTX 4090 Mobile, a 43.3% delta. This indicates a substantial lead in general compute workloads, likely stemming from the AMD card’s higher FP32 throughput (61.39 TFLOPS versus 32.98 TFLOPS) and larger memory bandwidth. The Passmark DirectX 11 test shows the second-biggest gap, with the RX 7900 XTX leading 356 to 262, a 35.9% advantage. This suggests AMD’s architecture handles DirectX 11 workloads more efficiently, possibly due to its higher texture rate of 959.2 GTexel/s versus 515.3 GTexel/s for NVIDIA.

In the Passmark G2D test, the RX 7900 XTX wins 1267 to 984, a 28.8% margin, reflecting better 2D rendering performance. The DirectX 12 test also favors AMD, with scores of 131 versus 107, a 22.4% lead, which is relevant for modern game titles. The Geekbench Vulkan test shows a 12.8% advantage for the RX 7900 XTX (192597 vs. 170774), indicating stronger cross-platform graphics performance. The Passmark G3D test reveals a 14.8% lead (31238 vs. 27212), confirming the AMD card’s overall graphics superiority. Even in the Geekbench OpenCL test, the RX 7900 XTX wins 189573 to 180831, a 4.8% margin, which is narrower but still favorable.

The RTX 4090 Mobile’s only win in Passmark DirectX 10 (173 vs. 166, a 4% advantage) is a narrow but notable outlier. This could indicate better optimization for legacy APIs, though it does not compensate for losses elsewhere. The data shows that the RX 7900 XTX’s wins are generally large (most above 10%), while the RTX 4090 Mobile’s single win is modest. Across all nine tests, the AMD card’s cumulative performance advantage is clear, with its average score of 44019 also placing it above rivals like the NVIDIA Quadro M6000 (43313, 1.6% behind) and just below the AMD Radeon Pro 580 (44195, 0.4% ahead). The RTX 4090 Mobile, meanwhile, is 2.2% ahead of the AMD Radeon RX 7650 GRE in its nearest rival list, but 1.2% behind the Radeon Pro 580.

Specification Differences

The two GPUs differ across nearly every core specification. The RX 7900 XTX uses the Navi 31 chip on RDNA 3.0, while the RTX 4090 Mobile uses the AD103 chip on Ada Lovelace. Transistor counts differ by 11,800 million, with AMD at 57,700 million and NVIDIA at 45,900 million. Die sizes are 529 mm² for AMD versus 379 mm² for NVIDIA, though the NVIDIA chip has a higher transistor density (121.1M/mm² vs. 109.1M/mm²). Both use 5 nm TSMC process, but the RX 7900 XTX has a base clock of 1929 MHz and boost clock of 2498 MHz, while the RTX 4090 Mobile runs at 1335 MHz base and 1695 MHz boost.

Memory configurations are notably different: 24 GB GDDR6 on a 384-bit bus for AMD versus 16 GB GDDR6 on a 256-bit bus for NVIDIA. Bandwidth is 960.0 GB/s versus 576.0 GB/s, a 384 GB/s difference. Memory clocks are 2500 MHz (20 Gbps effective) for AMD and 2250 MHz (18 Gbps effective) for NVIDIA. The RX 7900 XTX has 6144 shading units, 384 TMUs, and 192 ROPs, compared to 9728 shading units, 304 TMUs, and 112 ROPs for the RTX 4090 Mobile. Ray tracing cores are 96 for AMD and 76 for NVIDIA, while only NVIDIA has 304 tensor cores. Pixel rates are 479.6 GPixel/s for AMD versus 189.8 GPixel/s for NVIDIA, and texture rates are 959.2 GTexel/s versus 515.3 GTexel/s. FP32 throughput is 61.39 TFLOPS for AMD and 32.98 TFLOPS for NVIDIA; FP16 is 122.8 TFLOPS (2:1) for AMD and 32.98 TFLOPS (1:1) for NVIDIA. The TDP is 355 W for AMD and 120 W for NVIDIA, with the AMD card being dual-slot with 2x 8-pin connectors, while NVIDIA is an IGP with no connectors. The RX 7900 XTX has a 750 W suggested PSU, while