AMD Radeon Instinct MI300X vs AMD Steam Machine GPU Comparison

Head-to-Head Benchmarks

The recorded data contains no direct head-to-head benchmark results for these two GPUs. Both the AMD Radeon Instinct MI300X and the AMD Steam Machine GPU have empty benchmark arrays, zero wins each, and equivalent percentile standings at 50.0% versus all GPUs. Their average benchmark scores are both recorded as zero, meaning no comparative performance measurements exist in the database at this time.

Without benchmark scores, the only numerical performance indicators come from the specification-level compute rates. The MI300X delivers 81.72 TFLOPS of FP32 throughput, while the Steam Machine GPU delivers 17.56 TFLOPS. That places the MI300X at approximately 4.65 times the raw FP32 compute of the Steam Machine GPU. In FP16, the gap widens dramatically: the MI300X reaches 653.7 TFLOPS via its 8:1 ratio, while the Steam Machine GPU delivers 17.56 TFLOPS at a 1:1 ratio.

Texture rate tells a similar story. The MI300X processes 2,553.6 GTexel/s, compared to 274.4 GTexel/s for the Steam Machine GPU. The MI300X is roughly 9.3 times faster in texture throughput. Pixel rate, however, shows a reversal: the Steam Machine GPU outputs 156.8 GPixel/s, while the MI300X is recorded at 0 MPixel/s, as it has no ROPs and no display outputs.

Memory bandwidth also favors the MI300X overwhelmingly. It offers 10.3 TB/s of bandwidth over an 8192-bit bus using HBM3, while the Steam Machine GPU provides 288.0 GB/s over a 128-bit bus using GDDR6. The MI300X has 192 GB of memory, 24 times the 8 GB found on the Steam Machine GPU.

Architecture Differences

The two GPUs come from different architectural families entirely. The MI300X uses CDNA 3.0, AMD's compute-optimized architecture, built on the Aqua Vanjaram chip. The Steam Machine GPU uses RDNA 3.0, AMD's graphics-oriented architecture, with the Navi 33 chip and the codename Hotpink Bonefish. Both are manufactured by TSMC, but on different nodes: the MI300X uses a 5 nm process, while the Steam Machine GPU uses a 6 nm process.

Transistor counts differ by an order of magnitude. The MI300X packs 153,000 million transistors on a 1017 mm² die, giving a transistor density of 150.4M per mm². The Steam Machine GPU contains 13,300 million transistors on a 204 mm² die, with a density of 65.2M per mm². The MI300X die is nearly five times larger physically and contains over 11 times more transistors.

Compute resources diverge sharply. The MI300X has 19,456 shading units and 1,216 texture mapping units, but zero ROPs and no recorded RT cores or tensor cores. The Steam Machine GPU has 1,792 shading units, 112 TMUs, 64 ROPs, and 28 RT cores. The MI300X omits graphics-specific hardware because it is a data center accelerator with no display outputs, while the Steam Machine GPU carries full graphics capabilities including HDMI 2.1a and DisplayPort 2.1 outputs.

Clock behavior also differs. The MI300X runs at a 1000 MHz base and 2100 MHz boost. The Steam Machine GPU has a 1720 MHz base, 2250 MHz game clock, and 2450 MHz boost. Despite lower clock speeds, the MI300X achieves far higher throughput because of its massive core count and memory subsystem.

The MI300X belongs to the Radeon Instinct (MIx) generation with a release date of 2023-12-05, while the Steam Machine GPU is part of the Console GPU (Valve) generation with a release date of 2026-06-28. The MI300X lists FirePro Data Center as its predecessor; the Steam Machine GPU has no predecessor recorded.

Where Each One Wins

Based on the specification data, the MI300X wins decisively in any compute-heavy workload. Its FP32 throughput of 81.72 TFLOPS and FP16 throughput of 653.7 TFLOPS position it for large-scale data center processing, scientific simulation, and AI training workloads where massive parallel arithmetic dominates. The 192 GB HBM3 memory pool with 10.3 TB/s bandwidth supports models and datasets far larger than the Steam Machine GPU could accommodate. The 8,192-bit memory bus allows the MI300X to feed its 19,456 shading units without bottlenecking, and the 2,553.6 GTexel/s texture rate indicates strong fill performance in compute contexts.

The Steam Machine GPU wins in graphics-oriented scenarios. Its 64 ROPs deliver 156.8 GPixel/s of pixel throughput, a capability entirely absent on the MI300X, which records 0 MPixel/s. The 28 RT cores provide hardware ray tracing support, which the MI300X lacks entirely. The Steam Machine GPU supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the MI300X lists no graphics API support at all. Display connectivity is another clear differentiator: the Steam Machine GPU offers 1x HDMI 2.1a and 1x DisplayPort 2.1, while the MI300X has no outputs.

The Steam Machine GPU also wins on power efficiency in practical terms. Its 110 W TDP contrasts with the MI300X's 750 W TDP, meaning the Steam Machine GPU delivers 17.56 TFLOPS at roughly 14.7% of the power draw. The Steam Machine GPU also has a smaller physical footprint at 156 mm by 152 mm by 162 mm, while the MI300X uses an OAM Module form factor with no listed dimensions.

Specification Differences

| Field | MI300X | Steam Machine GPU |

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

| Chip | Aqua Vanjaram | Navi 33 |

| Architecture | CDNA 3.0 | RDNA 3.0 |

| Process Node | 5 nm | 6 nm |

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

| Die Size | 1017 mm² | 204 mm² |

| Base Clock | 1000 MHz | 1720 MHz |

| Boost Clock | 2100 MHz | 2450 MHz |

| Game Clock | None | 2250 MHz |

| Memory | 192 GB HBM3 | 8 GB GDDR6 |

| Memory Bus | 8192 bit | 128 bit |

| Memory Bandwidth | 10.3 TB/s | 288.0 GB/s |

| Shading Units | 19,456 | 1,792 |

| TMUs | 1,216 | 112 |

| ROPs | 0 | 64 |

| RT Cores | None | 28 |

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

| Texture Rate | 2,553.6 GTexel/s | 274.4 GTexel/s |

| FP32 | 81.72 TFLOPS | 17.56 TFLOPS |

| FP16 | 653.7 TFLOPS (8:1) | 17.56 TFLOPS (1:1) |

| TDP | 750 W | 110 W |

| Bus Interface | PCIe 5.0 x16 | Not listed |

| 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 |

| Form Factor | OAM Module | Not listed |

| Suggested PSU | 1150 W | Not listed |

| Release Date | 2023-12-05 | 2026-06-28 |

| Production Status | Not listed | Active |

FAQ

Q: Which GPU has more memory?

A: The MI300X has 192 GB of HBM3 memory, while the Steam Machine GPU has 8 GB of GDDR6. The MI300X offers 24 times the memory capacity.

Q: Does the Steam Machine GPU support ray tracing?

A: Yes, the Steam Machine GPU includes 28 RT cores. The MI300X has no recorded RT cores.

Q: Which GPU has a higher boost clock?

A: The Steam Machine GPU boosts up to 2450 MHz, while the MI300X boosts to 2100 MHz. The Steam Machine GPU also has a 2250 MHz game clock.

Q: Can the MI300X output video to a display?

A: No, the MI300X has no display outputs. The Steam Machine GPU provides 1x HDMI 2.1a and 1x DisplayPort 2.1.

Q: What is the power consumption difference?

A: The MI300X has a 750 W TDP, while the Steam Machine GPU has a 110 W TDP. The MI300X also lists a suggested PSU of 1150 W.

Q: Which architecture does each GPU use?

A: The MI300X uses CDNA 3.0, and the Steam Machine GPU uses RDNA 3.0. Both are manufactured by TSMC, with the MI300X on 5 nm and the Steam Machine GPU on 6 nm.

The Verdict

The data positions these two GPUs for entirely different purposes. The MI300X is a data center accelerator with massive compute resources: 19,456 shading units, 81.72 TFLOPS FP32, 653.7 TFLOPS FP16, 192 GB HBM3, and 10.3 TB/s bandwidth. It has no graphics output, no ROPs, no RT cores, and no graphics API support. Its 750 W TDP and OAM Module form factor confirm a server-oriented design.

The Steam Machine GPU is a compact console-class graphics processor with 1,792 shading units, 17.56 TFLOPS FP32, 64 ROPs, 28 RT cores, and full graphics API support including DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. Its 110 W TDP and available display outputs make it suitable for consumer gaming and graphics rendering.

Any workload relying on raw arithmetic throughput, large memory capacity, or extreme memory bandwidth belongs to the MI300X. Any workload requiring pixel output, ray tracing, or standard graphics APIs belongs to the Steam Machine GPU. The 4.65 times FP32 advantage for the MI300X and its 35.8 times memory bandwidth advantage come at the cost of 6.8 times higher TDP and the complete absence of graphics functionality.

The release dates reinforce this split: the MI300X launched on 2023-12-05 as a data center part with FirePro Data Center lineage, while the Steam Machine GPU is scheduled for 2026-06-28 as a Valve console GPU. Users with compute-bound data center tasks should select the MI300X. Users building or upgrading a graphics-focused system should select the Steam Machine GPU. The database contains no benchmark results to compare them directly, so these conclusions rest entirely on the recorded specification differences.