AMD Instinct MI300 vs AMD Steam Machine GPU Comparison

Head-to-Head Benchmarks

The database contains no recorded benchmark scores for either the AMD Instinct MI300 or the AMD Steam Machine GPU. Both GPUs hold a 50th percentile position against all GPUs in the database, and both have an average benchmark score of zero. The head-to-head comparison table is empty, with zero wins recorded for either part.

The absence of measured performance data means the two accelerators cannot be ranked against each other through synthetic or real-world test suites. The Instinct MI300 delivers a theoretical FP32 throughput of 47.87 TFLOPS and FP16 performance of 47.87 TFLOPS (1:1), while the Steam Machine GPU reaches 17.56 TFLOPS in both FP32 and FP16 (1:1). These raw compute figures indicate a large gap in peak arithmetic capability, but without benchmark results, the practical performance delta remains unquantified.

Texture and pixel throughput also diverge sharply. The Instinct MI300 processes 1,496.0 GTexel/s, which is roughly 5.4 times the Steam Machine GPU's 274.4 GTexel/s. Pixel rate tells a different story: the Instinct MI300 reports 0 MPixel/s, as it has no ROPs, while the Steam Machine GPU delivers 156.8 GPixel/s. The Instinct MI300 is not designed for rasterized output, so its pixel rate is effectively nonexistent.

Memory bandwidth favors the Instinct MI300 by an enormous margin. The MI300 accesses 5.32 TB/s across an 8192-bit HBM3 interface, compared to 288.0 GB/s over a 128-bit GDDR6 bus for the Steam Machine GPU. That is approximately 18.5 times the bandwidth. The MI300 also holds 128 GB of memory versus 8 GB, a 16-fold capacity advantage.

Clock speeds show the Steam Machine GPU running at higher frequencies. Its base clock is 1720 MHz, boost is 2450 MHz, and game clock is 2250 MHz. The Instinct MI300 runs at 1000 MHz base and 1700 MHz boost. The Steam Machine GPU's memory clock of 2250 MHz (18 Gbps effective) also exceeds the Instinct MI300's 1300 MHz (5.2 Gbps effective), though the MI300 compensates with a vastly wider bus.

Neither GPU has recorded wins in any category, so the database offers no direct score-based comparison. The theoretical specifications, however, clearly separate the two into different performance tiers.

Where Each One Wins

The Instinct MI300 wins on every metric tied to raw compute scale, memory capacity, and memory bandwidth. Its 47.87 TFLOPS FP32 figure is 2.7 times the Steam Machine GPU's 17.56 TFLOPS. Texture rate, at 1,496.0 GTexel/s versus 274.4 GTexel/s, gives the MI300 a 5.4x advantage. The 128 GB HBM3 pool with 5.32 TB/s bandwidth dwarfs the 8 GB GDDR6 configuration with 288.0 GB/s. These characteristics point to workloads that saturate large data sets or require sustained arithmetic throughput, such as compute-heavy data center tasks.

The Steam Machine GPU wins on pixel processing and display connectivity. It has 64 ROPs and produces 156.8 GPixel/s, while the MI300 has zero ROPs and no pixel output. The Steam Machine GPU also offers 1x HDMI 2.1a and 1x DisplayPort 2.1 outputs, whereas the MI300 has no display outputs. The Steam Machine GPU draws 110 W under its TDP rating, compared to 600 W for the MI300, and requires no power connectors, making it far simpler to integrate into a compact console chassis. Its dimensions of 156 mm by 152 mm by 162 mm contrast with the MI300's 267 mm length and 111 mm height, though the MI300's width is not recorded.

The Steam Machine GPU supports a full graphics API stack: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI300 lists N/A for DirectX, OpenGL, and Vulkan. For any rendering or gaming workload, the Steam Machine GPU is the only one of the two with functional graphics APIs and output capability. The MI300 is a compute accelerator, not a renderer.

The MI300 uses PCIe 5.0 x16 for host connection and requires a 1000 W suggested PSU with 2x 8-pin power connectors. The Steam Machine GPU lists no bus interface, no PSU recommendation, and no power connectors. This reflects their different deployment contexts: the MI300 targets server racks with dedicated power delivery, while the Steam Machine GPU is designed for a fixed console enclosure.

Architecture Differences

The two GPUs come from different architectural families. The Instinct MI300 uses CDNA 3.0, built on the Aqua Vanjaram chip, while the Steam Machine GPU uses RDNA 3.0, built on the Navi 33 chip (codename Hotpink Bonefish). Both are manufactured by TSMC, but on different nodes: the MI300 uses 5 nm, and the Steam Machine GPU uses 6 nm.

Transistor counts differ by an order of magnitude. The MI300 packs 153,000 million transistors on a 1017 mm² die, yielding 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 MI300's die is roughly five times larger and holds over 11 times more transistors.

Shader resources follow the same pattern. The MI300 has 14,080 shading units and 880 TMUs, while the Steam Machine GPU has 1,792 shading units and 112 TMUs. The MI300 has no ROPs, no ray tracing cores, and no tensor cores listed. The Steam Machine GPU has 64 ROPs and 28 ray tracing cores, but no tensor cores.

Memory architecture is fundamentally different. The MI300 uses HBM3 with a 8192-bit bus and 128 GB capacity. The Steam Machine GPU uses GDDR6 with a 128-bit bus and 8 GB capacity. The MI300's memory clock is 1300 MHz (5.2 Gbps effective), while the Steam Machine GPU's memory clock is 2250 MHz (18 Gbps effective). Despite the lower clock, the MI300's bus width delivers 5.32 TB/s, versus 288.0 GB/s for the Steam Machine GPU.

Feature sets diverge on graphics support. The MI300 has no display outputs and no graphics API support. The Steam Machine GPU provides HDMI 2.1a and DisplayPort 2.1 outputs, plus DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4. The MI300 does not expose pixel rate, while the Steam Machine GPU reports 156.8 GPixel/s.

Power delivery also differs. The MI300 has a TDP of 600 W, uses 2x 8-pin connectors, and recommends a 1000 W PSU. The Steam Machine GPU has a TDP of 110 W, uses no connectors, and has no PSU recommendation. The MI300 is a PCIe 5.0 x16 card sized at 267 mm by 111 mm. The Steam Machine GPU is a compact module at 156 mm by 152 mm by 162 mm.

The MI300 was released in January 2023 as part of the Instinct (MIx) generation, succeeding Radeon Instinct. The Steam Machine GPU is scheduled for a June 2026 release as a Console GPU (Valve), with production status marked Active. The MI300's production status is not recorded.

The Verdict

The recorded data separates these two GPUs into distinct roles with no overlap. The Instinct MI300 is a compute-oriented accelerator with 47.87 TFLOPS FP32, 128 GB of HBM3, 5.32 TB/s bandwidth, and no display or graphics API support. The Steam Machine GPU is a graphics-oriented console chip with 17.56 TFLOPS FP32, 8 GB GDDR6, 288.0 GB/s bandwidth, 64 ROPs, 28 ray tracing cores, and full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support.

For workloads involving large-scale parallel computation, high-bandwidth memory access, or high texture throughput, the MI300's specifications dominate. Its 5.4x texture rate advantage and 18.5x memory bandwidth advantage make it suited for data center compute tasks. The absence of rasterization hardware means it cannot drive displays or run graphics pipelines.

For rendering, gaming, or any workload requiring pixel output, the Steam Machine GPU is the only viable option. It is the sole GPU of the two with ROPs, display outputs, and graphics API support. Its 110 W TDP and lack of external power connectors also make it appropriate for a compact console form factor.

The database records no benchmark scores or wins for either GPU, so the verdict rests entirely on architectural and specification differences. The MI300 targets compute density at 600 W with a 1000 W PSU requirement, while the Steam Machine GPU targets efficiency and graphics capability at 110 W with no additional power delivery. Neither part can substitute for the other in its intended environment. The MI300 is the choice for compute-heavy server workloads; the Steam Machine GPU is the choice for console graphics output.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The AMD Instinct MI300 delivers 47.87 TFLOPS FP32, while the AMD Steam Machine GPU delivers 17.56 TFLOPS FP32, giving the MI300 a 2.7x advantage.

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

A: No. The Instinct MI300 lists no display outputs and reports a pixel rate of 0 MPixel/s, with no ROPs. The Steam Machine GPU offers 1x HDMI 2.1a and 1x DisplayPort 2.1.

Q: How much memory does each GPU have and what type?

A: The Instinct MI300 has 128 GB of HBM3 on an 8192-bit bus with 5.32 TB/s bandwidth. The Steam Machine GPU has 8 GB of GDDR6 on a 128-bit bus with 288.0 GB/s bandwidth.

Q: What ray tracing capabilities does each GPU have?

A: The Steam Machine GPU includes 28 ray tracing cores. The Instinct MI300 lists no ray tracing cores.

Q: What are the power requirements for each GPU?

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

Q: Which GPU supports DirectX 12 Ultimate?

A: The Steam Machine GPU supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The Instinct MI300 lists N/A for DirectX, OpenGL, and Vulkan.

Q: What process nodes are used for each GPU?

A: The Instinct MI300 uses a 5 nm TSMC process, while the Steam Machine GPU uses a 6 nm TSMC process.