AMD Steam Machine GPU vs NVIDIA GeForce RTX 4070 Mobile Comparison

The Verdict

The database comparison for these two mobile graphics solutions is heavily one-sided, but that is only because the AMD Steam Machine GPU has no recorded benchmark scores, a 50th percentile standing, and zero average score, while the NVIDIA GeForce RTX 4070 Mobile holds a 73rd percentile standing and an average benchmark score of 27,435. The data shows that the RTX 4070 Mobile is the only one of the two with any measured performance data, making it the clear choice for any task requiring proven compute or graphics capability.

The AMD Steam Machine GPU, a console-oriented part from Valve's hardware line, is listed as Active in production with a release date after the NVIDIA part, but it lacks any benchmark entries. The RTX 4070 Mobile, by contrast, has nine separate benchmark scores ranging from a Passmark G2D score of 763 to a Geekbench OpenCL score of 109,197. For a buyer choosing between these two specific GPUs, the recorded data supports only the NVIDIA part as a functional, measurable graphics processor.

Architecture Differences

The architectural split between these two parts is fundamental. The AMD Steam Machine GPU uses the Navi 33 chip built on RDNA 3.0 architecture, with the codename Hotpink Bonefish, and is classified under the generation "Console GPU (Valve)". It is fabricated on a 6 nm process at TSMC, containing 13,300 million transistors on a 204 mm² die, which yields a transistor density of 65.2M per mm².

The NVIDIA GeForce RTX 4070 Mobile uses the AD106 chip built on Ada Lovelace architecture, classified under "GeForce 40 Mobile". It is fabricated on a 5 nm process at TSMC, containing 22,900 million transistors on a 188 mm² die, which yields a higher transistor density of 121.8M per mm². The NVIDIA die is physically smaller but packs nearly 73% more transistors, indicating a denser, more complex design.

Feature-wise, the RTX 4070 Mobile includes 144 tensor cores, which the AMD part does not list at all. Both GPUs support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, so API compatibility is identical. The AMD part uses 28 ray tracing cores, while the NVIDIA part uses 36 RT cores. Display output differs: the AMD part has 1x HDMI 2.1a and 1x DisplayPort 2.1, while the NVIDIA part is listed as "Portable Device Dependent", reflecting its laptop integration.

Head-to-Head Benchmarks

There are no head-to-head benchmark entries in the database, and the AMD Steam Machine GPU has zero benchmark scores. The RTX 4070 Mobile, however, provides a full benchmark profile. The Geekbench OpenCL score of 109,197 and the Geekbench Vulkan score of 108,367 show strong compute performance. In Passmark tests, the RTX 4070 Mobile scores 19587 in G3D, 8399 in GPU compute, 763 in G2D, and lower scores in older DirectX versions: 223 in DirectX 9, 179 in DirectX 11, 116 in DirectX 10, and 85 in DirectX 12.

The RTX 4070 Mobile's nearest rivals in the database include the AMD Radeon RX 6700 XT with an average score of 27,425 and a delta of 0%, the NVIDIA GeForce RTX 3090 with an average score of 27,565 and a delta of -0.5%, the NVIDIA RTX PRO 4000 Blackwell with an average score of 27,135 and a delta of 1.1%, and the AMD Radeon Pro Vega 20 with an average score of 27,839 and a delta of -1.5%. This places the RTX 4070 Mobile within a tight performance band around these desktop-class parts, trailing the Radeon Pro Vega 20 by 1.5% and leading the RTX PRO 4000 Blackwell by 1.1%.

Since the AMD Steam Machine GPU has no scores, no direct comparison of wins is possible. The wins tally shows 0 for AMD and 0 for NVIDIA in the head-to-head field, but the practical interpretation is that the NVIDIA part has measurable results while the AMD part does not.

Specification Differences

The specifications diverge on nearly every hardware metric. Clock speeds: the AMD part runs a base clock of 1720 MHz, a boost of 2450 MHz, and a game clock of 2250 MHz, while the NVIDIA part runs a base of 1395 MHz and a boost of 1695 MHz, with no game clock listed. Memory clocks differ as well: AMD uses 2250 MHz with 18 Gbps effective, NVIDIA uses 2000 MHz with 16 Gbps effective.

Memory bandwidth favors AMD at 288.0 GB/s versus NVIDIA's 256.0 GB/s, though both use 8 GB of GDDR6 on a 128-bit bus. Compute unit counts favor NVIDIA heavily: 4608 shading units versus 1792, 144 TMUs versus 112, and 48 ROPs versus 64. The AMD part has a higher pixel rate at 156.8 GPixel/s versus 81.36 GPixel/s, but NVIDIA has a slightly lower texture rate at 244.1 GTexel/s versus AMD's 274.4 GTexel/s.

FP32 throughput favors AMD at 17.56 TFLOPS versus NVIDIA's 15.62 TFLOPS, with both listing FP16 at 1:1 ratio to FP32. Power draw is close: AMD at 110 W, NVIDIA at 115 W. The NVIDIA part specifies a PCIe 4.0 x8 bus interface, while the AMD part has no bus interface listed. The AMD part has physical dimensions of 156 mm length, 152 mm height, and 162 mm width, while the NVIDIA part has no dimensions listed and is classified as an IGP (integrated graphics processor) with slot width "IGP". Both use no external power connectors. Release dates differ: AMD on 2026-06-28, NVIDIA on 2023-01-02. The NVIDIA part has a predecessor (GeForce 30 Mobile) and successor (GeForce 50 Mobile), while the AMD part has neither.

FAQ

Q: Which GPU has a higher average benchmark score?

A: The NVIDIA GeForce RTX 4070 Mobile has an average benchmark score of 27,435. The AMD Steam Machine GPU has an average benchmark score of 0, as it has no recorded benchmarks.

Q: What is the process node difference between the two GPUs?

A: The AMD Steam Machine GPU uses a 6 nm process at TSMC, while the NVIDIA GeForce RTX 4070 Mobile uses a 5 nm process at TSMC.

Q: Do both GPUs support the same graphics APIs?

A: Yes, both support DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

Q: How does the RTX 4070 Mobile compare to its nearest rival, the AMD Radeon RX 6700 XT?

A: The RTX 4070 Mobile has an average score of 27,435, while the RX 6700 XT has an average score of 27,425, resulting in a delta of 0% between them.

Q: What is the memory bandwidth of each GPU?

A: The AMD Steam Machine GPU has a memory bandwidth of 288.0 GB/s, while the NVIDIA GeForce RTX 4070 Mobile has 256.0 GB/s. Both use 8 GB of GDDR6 on a 128-bit bus.

Q: Which GPU has more shading units?

A: The NVIDIA GeForce RTX 4070 Mobile has 4608 shading units, while the AMD Steam Machine GPU has 1792 shading units.

Q: What is the transistor density of each chip?

A: The AMD Steam Machine GPU has a transistor density of 65.2M per mm², while the NVIDIA GeForce RTX 4070 Mobile has a density of 121.8M per mm².

Where Each One Wins

The NVIDIA GeForce RTX 4070 Mobile wins in every measured category, simply because it has measurements. It delivers a Geekbench OpenCL score of 109,197 and a Geekbench Vulkan score of 108,367, which represent strong compute and graphics workloads. Its Passmark G3D score of 19,587 and GPU compute score of 8,399 indicate solid rasterization and compute capability. The RTX 4070 Mobile also holds a 73rd percentile ranking among all GPUs in the database, placing it above the median part.

The AMD Steam Machine GPU wins in theoretical specifications only. It has a higher boost clock of 2450 MHz versus 1695 MHz, a higher FP32 throughput of 17.56 TFLOPS versus 15.62 TFLOPS, higher memory bandwidth of 288.0 GB/s versus 256.0 GB/s, a higher pixel rate of 156.8 GPixel/s versus 81.36 GPixel/s, a higher texture rate of 274.4 GTexel/s versus 244.1 GTexel/s, and more ROPs at 64 versus 48. It also draws slightly less power at 110 W versus 115 W and has a smaller transistor count at 13,300 million versus 22,900 million.

For a user relying on recorded performance data, the RTX 4070 Mobile is the only viable option. For a user comparing paper specifications, the AMD part offers higher throughput in several compute metrics but lacks any benchmark validation. The RTX 4070 Mobile also benefits from being part of the GeForce 40-series with a defined predecessor and successor, while the AMD part is isolated as a console GPU with no family lineage. The RTX 4070 Mobile's tensor cores (144) provide a feature set absent from the AMD specification sheet, which may matter for AI-adjacent workloads, though no benchmark data exists to quantify that advantage.