NVIDIA GeForce RTX 4090 vs NVIDIA GeForce RTX 4090 Mobile Comparison

The Verdict

The data is unambiguous. The desktop NVIDIA GeForce RTX 4090 wins every single head-to-head benchmark against the NVIDIA GeForce RTX 4090 Mobile. Out of nine recorded comparisons, the desktop card takes all nine, with no wins for the mobile part. The desktop card’s average benchmark score of 60,347 places it in the 88th percentile of all GPUs, while the mobile card’s 43,667 average lands in the 84th percentile. If you need maximum compute throughput, the desktop RTX 4090 is the only choice from this pair.

The mobile RTX 4090 is not a weak part, however. Its average score of 43,667 puts it right alongside the NVIDIA Quadro M6000 (43,301) and the GeForce RTX 5050 Mobile (43,268), with delta percentages of 0.8% and 0.9% respectively. It is effectively a peer of those cards. The desktop 4090, by contrast, sits near the AMD Radeon Pro W6600M (61,896) and Intel Arc Pro A60 (60,326), with deltas of -2.5% and 0%. The desktop card is in a completely different performance class.

For a desktop workstation or high-end gaming rig, the desktop RTX 4090 is the obvious pick. For a laptop, the mobile RTX 4090 is what you get, and the data shows it performs at roughly the level of a previous-generation Quadro. The choice is not about preference, it is about form factor. The desktop card offers massive compute, while the mobile card provides a portable but smaller slice of that capability.

Architecture Differences

Both cards use NVIDIA’s Ada Lovelace architecture and are built on TSMC’s 5 nm process node. That is where the architectural similarities end. The desktop RTX 4090 uses the AD102 chip, a massive die measuring 609 mm² with 76,300 million transistors. The mobile RTX 4090 uses the AD103 chip, which is substantially smaller at 379 mm² and 45,900 million transistors. Transistor density is close, 125.3M per mm² for the desktop and 121.1M per mm² for the mobile, but the raw transistor count difference is huge.

The desktop chip has 16,384 shading units, 512 texture mapping units (TMUs), and 176 render output units (ROPs). The mobile chip has 9,728 shading units, 304 TMUs, and 112 ROPs. Ray tracing cores scale similarly: 128 on the desktop versus 76 on the mobile. Tensor cores follow the same pattern, 512 on the desktop versus 304 on the mobile. Every compute resource is roughly 40% to 60% higher on the desktop part.

Memory architecture differs as well. The desktop card uses 24 GB of GDDR6X on a 384-bit bus, delivering 1.01 TB/s of bandwidth. The mobile card uses 16 GB of GDDR6 on a narrower 256-bit bus, providing 576.0 GB/s. Clock speeds also favor the desktop. The desktop base clock is 2235 MHz with a boost of 2520 MHz, while the mobile part runs at 1335 MHz base and 1695 MHz boost. The memory clock is 1313 MHz (21 Gbps effective) on desktop versus 2250 MHz (18 Gbps effective) on mobile.

Power delivery is another major divider. The desktop card has a TDP of 450 W and requires a 16-pin power connector with a suggested 850 W PSU. The mobile card has a TDP of 120 W, uses no external power connectors, and is an integrated graphics package (IGP). This is a fundamental difference: one is a triple-slot expansion card, the other is soldered into a laptop.

Where Each One Wins

There is no benchmark category where the mobile RTX 4090 wins. The desktop card dominates across all nine recorded tests. The biggest margin is in Passmark GPU Compute, where the desktop scores 26,613 versus 12,347, a delta of 115.5%. That is more than double the mobile card’s compute throughput. For any workload that stresses raw GPGPU math, this is a massive gap.

In Geekbench Vulkan, the desktop card scores 271,631 against the mobile’s 170,774, a 59.1% advantage. This suggests a significant lead in cross-platform graphics API performance. The desktop also wins Geekbench OpenCL by 41.2%, scoring 255,416 versus 180,831. The desktop’s advantage in 3DMark Steel Nomad DX12 is not listed as a head-to-head, but the desktop’s 9,223 score (from its own benchmark list) indicates a strong showing in modern raster workloads.

The desktop card wins Passmark G3D by 40.4%, scoring 38,194 versus 27,212. For DirectX 12, the desktop wins by 40.2% (150 versus 107). DirectX 11 shows a 24.4% lead (326 versus 262), and DirectX 10 a 29.5% lead (224 versus 173). Even the oldest API tested, DirectX 9, sees a 28.1% advantage for the desktop (397 versus 310). The 2D performance gap is smaller but still clear, with the desktop scoring 1,299 versus 984 in Passmark G2D, a 32% lead.

The desktop card is the clear winner for any high-end gaming, rendering, or compute task. The mobile card is suitable for lighter workloads, but it is not a substitute for the desktop part.

FAQ

Q: Is the desktop RTX 4090 faster than the mobile RTX 4090 in every test?

A: Yes. The desktop card wins all nine head-to-head benchmarks, with no wins for the mobile card.

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

A: The largest difference is in Passmark GPU Compute, where the desktop card scores 26,613 versus 12,347, a delta of 115.5%. The desktop is more than double the mobile card’s compute performance.

Q: How does the mobile RTX 4090 compare to other desktop GPUs?

A: The mobile card’s average score of 43,667 places it near the NVIDIA Quadro M6000 (43,301, delta 0.8%) and the GeForce RTX 5050 Mobile (43,268, delta 0.9%). It is roughly on par with those parts, not with the desktop 4090.

Q: What is the memory bandwidth difference?

A: The desktop card has 1.01 TB/s of bandwidth from 24 GB of GDDR6X on a 384-bit bus. The mobile card has 576.0 GB/s from 16 GB of GDDR6 on a 256-bit bus.

Q: Does the mobile card have a lower power draw?

A: Yes. The desktop card has a TDP of 450 W, while the mobile card has a TDP of 120 W. The mobile card uses no external power connectors, while the desktop requires a 16-pin connector.

Q: Which card has better ray tracing hardware?

A: The desktop card has 128 ray tracing cores, while the mobile card has 76. The desktop also has 512 tensor cores versus 304 on the mobile.

Head-to-Head Benchmarks

The desktop RTX 4090 wins every recorded comparison, but the margins vary by workload. The most decisive result is in Passmark GPU Compute. The desktop scores 26,613, the mobile scores 12,347, and the delta is 115.5%. This is the only test where the desktop more than doubles the mobile score. For compute-heavy tasks like machine learning inference or physics simulation, this gap is decisive.

Geekbench Vulkan shows the next largest gap. The desktop scores 271,631 versus 170,774, a 59.1% delta. This is a strong indicator that the desktop card handles modern cross-platform graphics APIs much better. Geekbench OpenCL follows at 41.2%, with scores of 255,416 and 180,831. Both Geekbench tests point to a consistent lead in general compute and API-level performance.

Passmark G3D, a measure of overall 3D graphics performance, has the desktop at 38,194 and the mobile at 27,212, a 40.4% delta. This is closely followed by Passmark DirectX 12, where the desktop scores 150 versus 107, a 40.2% delta. The DirectX 11 test shows a smaller but still significant lead: 326 versus 262, a 24.4% delta. DirectX 10 shows 224 versus 173, a 29.5% delta, and DirectX 9 shows 397 versus 310, a 28.1% delta.

The 2D test, Passmark G2D, shows the smallest absolute scores but still a clear win. The desktop scores 1,299 versus 984, a 32% delta. Even in a test that is less dependent on raw compute, the desktop maintains its advantage. Across all nine benchmarks, the desktop card’s wins range from 24.4% to 115.5%, with no close contest. The data shows a consistent, across-the-board performance hierarchy.

Specification Differences

The two cards differ substantially in nearly every specification. The chip is different, AD102 on desktop versus AD103 on mobile. The die size is 609 mm² versus 379 mm². Transistor count is 76,300 million versus 45,900 million. The process node is the same, 5 nm from TSMC, but transistor density is slightly higher on desktop at 125.3M per mm² versus 121.1M per mm².

Clock speeds are far apart. The desktop base clock is 2235 MHz, boosted to 2520 MHz. The mobile base is 1335 MHz, boosted to 1695 MHz. Memory clocks also differ: 1313 MHz (21 Gbps effective) on desktop versus 2250 MHz (18 Gbps effective) on mobile. Memory capacity is 24 GB of GDDR6X versus 16 GB of GDDR6. Bus width is 384-bit versus 256-bit, and bandwidth is 1.01 TB/s versus 576.0 GB/s.

Compute resources scale accordingly. Shading units are 16,384 versus 9,728. TMUs are 512 versus 304. ROPs are 176 versus 112. Ray tracing cores are 128 versus 76. Tensor cores are 512 versus 304. Pixel rate is 443.5 GPixel/s versus 189.8 GPixel/s. Texture rate is 1,290.2 GTexel/s versus 515.3 GTexel/s. FP32 and FP16 performance is 82.58 TFLOPS on desktop versus 32.98 TFLOPS on mobile.

Power and physical design are entirely different. The desktop TDP is 450 W with a triple-slot cooler and a single 16-pin connector, requiring an 850 W suggested PSU. The mobile TDP is 120 W, is an integrated graphics package (IGP), uses no external power, and needs no PSU recommendation. The desktop has a PCIe 4.0 x16 interface and fixed display outputs (1x HDMI 2.1, 3x DisplayPort 1.4a). The mobile card also uses PCIe 4.0 x16 but its display outputs are marked as portable device dependent. The desktop card is 304 mm long, 137 mm high, and 61 mm wide; the mobile card has no recorded dimensions. Production status also differs, with the desktop listed as end-of-life and the mobile as active.