AMD Radeon Instinct MI300 vs AMD Steam Machine GPU Comparison

Where Each One Wins

The AMD Radeon Instinct MI300 and the AMD Steam Machine GPU occupy opposite ends of the hardware spectrum, and the recorded data reflects that split clearly. The MI300 is a data center accelerator built around the CDNA 3.0 architecture, while the Steam Machine GPU is a console-oriented graphics processor using RDNA 3.0. The benchmark data shows no head-to-head wins for either part, but the specification fields point to distinct roles.

The MI300 wins decisively in compute throughput. Its FP32 output of 47.87 TFLOPS dwarfs the Steam Machine GPU's 17.56 TFLOPS, a margin of roughly 2.7 times. The gap widens dramatically in FP16 work: the MI300 delivers 383.0 TFLOPS with an 8:1 ratio, while the Steam Machine GPU manages 17.56 TFLOPS at a 1:1 ratio. That is a 21.8 times advantage for the MI300 in half-precision math, which matters for machine learning training and inference workloads where reduced precision is standard practice.

Memory capacity and bandwidth also favor the MI300 without contest. The accelerator carries 128 GB of HBM3 across an 8192-bit bus, yielding 6.55 TB/s of bandwidth. The Steam Machine GPU has 8 GB of GDDR6 on a 128-bit bus, producing 288.0 GB/s. The MI300 offers 16 times the memory capacity and roughly 22.7 times the bandwidth. For large model weights or massive dataset residency, the MI300 is the only one of the two that can hold the working set on-board.

Texture throughput follows the same pattern. The MI300 reaches 1,496.0 GTexel/s with 880 TMUs, while the Steam Machine GPU reaches 274.4 GTexel/s with 112 TMUs. The MI300 is about 5.5 times faster in texture fill. Pixel rate is a different story: the MI300 lists 0 MPixel/s with no ROPs, while the Steam Machine GPU outputs 156.8 GPixel/s from 64 ROPs. That means the MI300 cannot rasterize frames at all, while the Steam Machine GPU is a complete rendering device.

The Steam Machine GPU wins where graphics output matters. It provides 1x HDMI 2.1a and 1x DisplayPort 2.1, whereas the MI300 has no display outputs. It also supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI300 lists no API support in the database. The Steam Machine GPU uses 28 ray tracing cores, a feature the MI300 does not expose. For gaming or any interactive visual workload, the Steam Machine GPU is the only viable choice. The MI300 is a compute engine without a display path.

Architecture Differences

The two chips come from different architectural families. The MI300 uses CDNA 3.0, AMD's compute-optimized design, on the Aqua Vanjaram die. The Steam Machine GPU uses RDNA 3.0, the graphics-optimized design, on the Navi 33 die with the codename Hotpink Bonefish. This architectural split explains nearly every behavioral difference in the data.

Manufacturing nodes differ as well. The MI300 is built on a 5 nm process at TSMC, while the Steam Machine GPU uses a 6 nm process, also at TSMC. The smaller node helps the MI300 pack far more circuitry into its package. Transistor counts reflect the scale gap: the MI300 contains 153,000 million transistors on a 1017 mm² die, while the Steam Machine GPU contains 13,300 million transistors on a 204 mm² die. That is roughly 11.5 times more transistors on a die about 5 times larger. Transistor density also favors the MI300 at 150.4M per mm² versus 65.2M per mm² for the Steam Machine GPU.

The compute pipelines diverge sharply. The MI300 has 14,080 shading units and 880 TMUs but zero ROPs, which aligns with a pure compute accelerator that never needs to output pixels. The Steam Machine GPU has 1,792 shading units, 112 TMUs, and 64 ROPs, a balanced configuration for a rasterizing console part. The MI300 lists no ray tracing cores, while the Steam Machine GPU includes 28. Neither part lists tensor cores in the database, so AI acceleration must come through the shader and FP16 paths rather than dedicated tensor hardware.

Power and cooling requirements underline the different deployment contexts. The MI300 has a 600 W TDP with dual 8-pin power connectors and a suggested PSU of 1000 W. The Steam Machine GPU has a 110 W TDP and no external power connectors, drawing everything from its host slot. Clock behavior also differs: the MI300 runs at a 1000 MHz base and 1700 MHz boost, while the Steam Machine GPU runs at a 1720 MHz base, 2250 MHz game clock, and 2450 MHz boost. The Steam Machine GPU achieves higher clock speeds on a smaller, lower-power design, while the MI300 relies on massive parallelism and memory bandwidth rather than raw frequency.

Memory technology separates the two further. The MI300 uses HBM3 with a 1600 MHz memory clock and 6.4 Gbps effective data rate. The Steam Machine GPU uses GDDR6 with a 2250 MHz memory clock and 18 Gbps effective data rate. The MI300's 8192-bit bus is 64 times wider than the Steam Machine GPU's 128-bit bus, which is how it reaches 6.55 TB/s despite a slower per-pin data rate. The Steam Machine GPU compensates with a faster per-pin transfer rate but cannot approach the aggregate bandwidth.

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark scores for these two parts, and the average benchmark score for each is zero. The percentile ranking for both is 50th among all GPUs, which places them at the midpoint of the distribution in the database. Without direct measured scores, the specification fields serve as the only comparative evidence.

The largest measurable gap is in FP16 throughput. The MI300's 383.0 TFLOPS at an 8:1 ratio versus the Steam Machine GPU's 17.56 TFLOPS at a 1:1 ratio represents a 21.8 times difference. This is the single most lopsided comparison in the entire data set. It indicates that the MI300 is designed for half-precision compute workloads, likely neural network training or inference, where the 8:1 ratio means it can trade precision for speed. The Steam Machine GPU's 1:1 ratio suggests it treats FP16 as a straightforward half-width mode with no special acceleration.

FP32 compute shows a 2.7 times gap, with the MI300 at 47.87 TFLOPS and the Steam Machine GPU at 17.56 TFLOPS. This difference matters for scientific computing and simulation workloads that rely on single-precision floating point. The texture rate comparison is similar in magnitude: 1,496.0 GTexel/s versus 274.4 GTexel/s, a 5.5 times advantage for the MI300. The pixel rate reverses the trend entirely, with the Steam Machine GPU at 156.8 GPixel/s and the MI300 at 0 MPixel/s.

Memory bandwidth presents a 22.7 times advantage for the MI300. The 6.55 TB/s figure comes from the combination of 128 GB of HBM3 and an 8192-bit bus. The Steam Machine GPU's 288.0 GB/s is typical for a GDDR6 part with a 128-bit interface. Capacity follows the same direction: 128 GB versus 8 GB, a 16 times difference. The MI300 can hold entire datasets in memory, while the Steam Machine GPU must rely on system memory or streaming.

The Steam Machine GPU wins in clock speed and display capability. Its 2450 MHz boost clock is 44% higher than the MI300's 1700 MHz boost. Its game clock of 2250 MHz still exceeds the MI300's boost. The Steam Machine GPU also lists DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 support, while the MI300 has no API entries at all. These are not compute benchmarks, but they define which workloads each part can actually serve.

Specification Differences

| Field | AMD Radeon Instinct MI300 | AMD Steam Machine GPU |

|---|---|---|

| Architecture | CDNA 3.0 | RDNA 3.0 |

| Chip | Aqua Vanjaram | Navi 33 |

| Codename | None | Hotpink Bonefish |

| Generation | Radeon Instinct (MIx) | Console GPU (Valve) |

| Process node | 5 nm | 6 nm |

| Transistors | 153,000 million | 13,300 million |

| Die size | 1017 mm² | 204 mm² |

| Transistor density | 150.4M / mm² | 65.2M / mm² |

| Base clock | 1000 MHz | 1720 MHz |

| Boost clock | 1700 MHz | 2450 MHz |

| Game clock | None | 2250 MHz |

| Memory clock | 1600 MHz, 6.4 Gbps effective | 2250 MHz, 18 Gbps effective |

| Memory size | 128 GB | 8 GB |

| Memory type | HBM3 | GDDR6 |

| Memory bus | 8192 bit | 128 bit |

| Memory bandwidth | 6.55 TB/s | 288.0 GB/s |

| Shading units | 14080 | 1792 |

| TMUs | 880 | 112 |

| ROPs | 0 | 64 |

| Ray tracing cores | None | 28 |

| Pixel rate | 0 MPixel/s | 156.8 GPixel/s |

| Texture rate | 1,496.0 GTexel/s | 274.4 GTexel/s |

| FP32 | 47.87 TFLOPS | 17.56 TFLOPS |

| FP16 | 383.0 TFLOPS (8:1) | 17.56 TFLOPS (1:1) |

| TDP | 600 W | 110 W |

| Power connectors | 2x 8-pin | None |

| Suggested PSU | 1000 W | None |

| Bus interface | PCIe 5.0 x16 | None |

| Display outputs | No outputs | 1x HDMI 2.1a, 1x DisplayPort 2.1 |

| DirectX | None | 12 Ultimate (12_2) |

| OpenGL | None | 4.6 |

| Vulkan | None | 1.4 |

| Length | 267 mm (10.5 inches) | 156 mm (6.1 inches) |

| Height | 111 mm (4.4 inches) | 152 mm (6 inches) |

| Width | None | 162 mm (6.4 inches) |

| Release date | 2023-01-03 | 2026-06-28 |

| Production status | None | Active |

| Predecessor | FirePro Data Center | None |

The MI300 is physically longer at 267 mm versus 156 mm for the Steam Machine GPU, but the Steam Machine GPU is taller and wider. The MI300 uses PCIe 5.0 x16, while the Steam Machine GPU lists no bus interface. The release dates are separated by roughly three and a half years, with the MI300 arriving in early 2023 and the Steam Machine GPU scheduled for mid-2026.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Radeon Instinct MI300 reaches 47.87 TFLOPS in FP32, while the AMD Steam Machine GPU reaches 17.56 TFLOPS. The MI300 is approximately 2.7 times faster in single-precision compute.

Q: Can the AMD Radeon Instinct MI300 output video to a display?

A: No. The MI300 lists no display outputs, while the AMD Steam Machine GPU provides 1x HDMI 2.1a and 1x DisplayPort 2.1. The MI300 also has a pixel rate of 0 MPixel/s and 0 ROPs, confirming it cannot rasterize frames.

Q: What is the difference in memory bandwidth between the two?

A: The MI300 delivers 6.55 TB/s from 128 GB of HBM3 on an 8192-bit bus. The Steam Machine GPU delivers 288.0 GB/s from 8 GB of GDDR6 on a 128-bit bus. The MI300 has roughly 22.7 times more bandwidth.

Q: Which GPU supports ray tracing?

A: The AMD Steam Machine GPU includes 28 ray tracing cores. The AMD Radeon Instinct MI300 lists no ray tracing cores in the database.

Q: How do the power requirements compare?

A: The MI300 has a 600 W TDP, uses 2x 8-pin power connectors, and suggests a 1000 W PSU. The Steam Machine GPU has a 110 W TDP and no external power connectors.

Q: Which GPU has a higher boost clock?

A: The Steam Machine GPU boosts to 2450 MHz, while the MI300 boosts to 1700 MHz. The Steam Machine GPU's base clock of 1720 MHz is also higher than the MI300's boost clock.