AMD Instinct MI325X vs AMD Steam Machine GPU Comparison

The Verdict

The data presents two AMD GPUs with fundamentally different purposes. The AMD Instinct MI325X is a data center compute accelerator with no display outputs, designed for server workloads. The AMD Steam Machine GPU is a compact console graphics processor with active display outputs, built for gaming systems. Neither card is a substitute for the other. The MI325X targets high-performance computing, scientific simulation, and AI training where massive memory capacity and compute throughput are paramount. The Steam Machine GPU targets compact gaming hardware where efficiency, small physical footprint, and standard graphics APIs are required. Buyers should select based on workload: the MI325X for compute-heavy server tasks, the Steam Machine GPU for console gaming applications.

FAQ

Q: Which GPU has more memory bandwidth?

A: The AMD Instinct MI325X has a memory bandwidth of 6.14 TB/s, which is over 21 times higher than the Steam Machine GPU's 288.0 GB/s.

Q: Can the AMD Instinct MI325X output video to a display?

A: No. The MI325X has no display outputs, while the Steam Machine GPU provides 1x HDMI 2.1a and 1x DisplayPort 2.1.

Q: What is the difference in shading units between the two cards?

A: The MI325X has 19,456 shading units, while the Steam Machine GPU has 1,792 shading units. That is a 10.9 times difference in favor of the MI325X.

Q: Which GPU supports DirectX?

A: Only the Steam Machine GPU supports DirectX 12 Ultimate (12_2). The MI325X has no DirectX support, with its API entries marked as N/A.

Q: What is the thermal design power difference?

A: The MI325X has a TDP of 1000 W, while the Steam Machine GPU has a TDP of 110 W. The MI325X consumes roughly 9 times more power.

Q: Which GPU is based on a smaller manufacturing process?

A: The MI325X uses a 5 nm TSMC process, while the Steam Machine GPU uses a 6 nm TSMC process.

Where Each One Wins

The AMD Instinct MI325X wins decisively in raw compute throughput. Its FP32 performance is 81.72 TFLOPS, compared to 17.56 TFLOPS for the Steam Machine GPU. The texture rate of 2,553.6 GTexel/s versus 274.4 GTexel/s shows a similar magnitude of advantage. The MI325X also dominates in memory capacity with 256 GB of HBM3e versus 8 GB of GDDR6, and in memory bus width at 8192 bit versus 128 bit.

The AMD Steam Machine GPU wins in practical gaming and display capabilities. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, while the MI325X has no graphics API support listed. The Steam Machine GPU has a pixel rate of 156.8 GPixel/s, while the MI325X has 0 MPixel/s. The Steam Machine GPU also wins on power efficiency, with a 110 W TDP versus 1000 W, and on physical size, with dimensions of 156 mm by 152 mm by 162 mm versus an OAM Module form factor for the MI325X.

Head-to-Head Benchmarks

The recorded data shows no direct head-to-head benchmark scores between these two cards. The benchmark database lists zero wins for each side in direct comparisons. Both cards sit at the 50th percentile versus all GPUs, and neither has an average benchmark score above zero. This absence of comparative benchmark data indicates these products occupy separate market segments that rarely overlap in testing scenarios.

The FP32 compute figures, however, provide a clear mathematical comparison. The MI325X delivers 81.72 TFLOPS, which is 4.65 times the 17.56 TFLOPS of the Steam Machine GPU. The FP16 figures are identical to the FP32 figures for both cards at a 1:1 ratio, meaning the performance gap remains consistent across precision formats.

Memory bandwidth shows the most extreme disparity. The MI325X's 6.14 TB/s is 21.3 times the Steam Machine GPU's 288.0 GB/s. This bandwidth advantage, combined with 32 times more memory capacity (256 GB versus 8 GB), makes the MI325X suitable for large model training and inference workloads that would be impossible on the Steam Machine GPU.

The Steam Machine GPU counterbalances with features the MI325X lacks entirely. It has 28 ray tracing cores, a 156.8 GPixel/s pixel rate, and full graphics API support. The MI325X has no ray tracing cores listed, no pixel rate, and no API support. For any workload requiring rasterization, ray tracing, or display output, the Steam Machine GPU is the only functional choice.

Architecture Differences

The MI325X uses the Aqua Vanjaram chip built on CDNA 3.0 architecture, while the Steam Machine GPU uses the Navi 33 chip built on RDNA 3.0 architecture. These are distinct architectures optimized for different workloads. CDNA 3.0 focuses on compute density and memory throughput, while RDNA 3.0 balances compute with graphics rendering features.

The MI325X measures 1017 mm² with 153,000 million transistors, resulting in a transistor density of 150.4M per mm². The Steam Machine GPU measures 204 mm² with 13,300 million transistors, yielding a density of 65.2M per mm². The MI325X uses a 5 nm process node from TSMC, while the Steam Machine GPU uses a 6 nm node from the same foundry.

The MI325X has 19,456 shading units and 1,216 texture mapping units. It has zero ROPs, which aligns with its lack of rasterization capability. The Steam Machine GPU has 1,792 shading units, 112 TMUs, 64 ROPs, and 28 ray tracing cores. The presence of ROPs and ray tracing cores in the Steam Machine GPU confirms its graphics-oriented design.

Clock speeds differ significantly. The MI325X runs at a base of 1000 MHz and boosts to 2100 MHz. The Steam Machine GPU has a base of 1720 MHz, a boost of 2450 MHz, and a game clock of 2250 MHz. Memory clocks also differ: the MI325X operates at 1500 MHz with 6 Gbps effective, while the Steam Machine GPU operates at 2250 MHz with 18 Gbps effective.

The MI325X belongs to the Instinct (MIx) generation and follows the Radeon Instinct predecessor. The Steam Machine GPU belongs to the Console GPU (Valve) generation with the codename Hotpink Bonefish. The Steam Machine GPU has an active production status, while the MI325X's production status is not listed.

Specification Differences

The MI325X uses HBM3e memory with 256 GB capacity, an 8192 bit bus, and 6.14 TB/s bandwidth. The Steam Machine GPU uses GDDR6 memory with 8 GB capacity, a 128 bit bus, and 288.0 GB/s bandwidth.

The MI325X has a TDP of 1000 W and a suggested PSU of 1400 W. The Steam Machine GPU has a TDP of 110 W with no suggested PSU listed. The MI325X uses an OAM Module slot width with no power connectors, while the Steam Machine GPU has no slot width listed and no power connectors.

The MI325X connects via PCIe 5.0 x16, while the Steam Machine GPU has no bus interface listed. The MI325X has no display outputs, while the Steam Machine GPU offers 1x HDMI 2.1a and 1x DisplayPort 2.1.

The MI325X has no supported APIs, with DirectX, OpenGL, and Vulkan all marked as N/A. The Steam Machine GPU supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

The MI325X has no physical dimensions listed, while the Steam Machine GPU measures 156 mm in length, 152 mm in height, and 162 mm in width.

The MI325X was released on October 9, 2024, while the Steam Machine GPU has a release date of June 28, 2026. Neither card has a launch MSRP listed in the database. The MI325X has a predecessor named Radeon Instinct, while the Steam Machine GPU has no predecessor recorded. Neither card has a successor listed.