AMD Radeon Instinct MI308X vs AMD Steam Machine GPU Comparison

Q: What are the core architectures of the AMD Radeon Instinct MI308X and the AMD Steam Machine GPU?

A: The MI308X uses the CDNA 3.0 architecture with the Aqua Vanjaram chip, while the Steam Machine GPU uses the RDNA 3.0 architecture with the Navi 33 chip (codename Hotpink Bonefish).

Q: How do the memory systems differ between the two cards?

A: The MI308X has 192 GB of HBM3 memory on an 8192-bit bus with 10.3 TB/s bandwidth, whereas the Steam Machine GPU has 8 GB of GDDR6 on a 128-bit bus with 288.0 GB/s bandwidth.

Q: Which card has a higher boost clock?

A: The Steam Machine GPU boosts to 2450 MHz, while the MI308X boosts to 2100 MHz.

Q: What are the transistor counts and die sizes?

A: The MI308X contains 153,000 million transistors on a 1017 mm² die (TSMC 5 nm), while the Steam Machine GPU contains 13,300 million transistors on a 204 mm² die (TSMC 6 nm).

Q: What is the FP32 compute output for each?

A: The MI308X delivers 81.72 TFLOPS FP32, and the Steam Machine GPU delivers 17.56 TFLOPS FP32.

Q: Which card has display outputs?

A: The Steam Machine GPU has 1x HDMI 2.1a and 1x DisplayPort 2.1, while the MI308X has no outputs.

Architecture Differences

The two AMD parts target completely separate computing domains, and their silicon reflects that split. The MI308X is built on the CDNA 3.0 architecture, a compute-optimized design with the Aqua Vanjaram chip. The Steam Machine GPU is built on RDNA 3.0, a graphics-oriented architecture using the Navi 33 die, codenamed Hotpink Bonefish. The fabrication nodes differ: the MI308X uses TSMC 5 nm, while the Steam Machine GPU uses TSMC 6 nm.

Transistor integration shows the scale gap. The MI308X packs 153,000 million transistors into 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 MI308X is a massive accelerator, while the Steam Machine GPU is a compact console part.

Compute resources diverge sharply. The MI308X has 19,456 shading units and 1,216 texture mapping units, but it has zero ROPs and no dedicated ray tracing cores. Its pixel rate is listed as 0 MPixel/s, which confirms it is not a rasterization device. The Steam Machine GPU has 1,792 shading units, 112 TMUs, 64 ROPs, and 28 ray tracing cores, with a pixel rate of 156.8 GPixel/s. The texture rates also differ: the MI308X reaches 2,553.6 GTexel/s, whereas the Steam Machine GPU reaches 274.4 GTexel/s.

Memory architecture is another fundamental split. The MI308X uses 192 GB of HBM3 on a 8192-bit bus, delivering 10.3 TB/s of bandwidth. Memory clock is 2525 MHz, which translates to 10.1 Gbps effective. The Steam Machine GPU uses 8 GB of GDDR6 on a 128-bit bus, with 288.0 GB/s bandwidth. Its memory clock is 2250 MHz, or 18 Gbps effective. The MI308X also carries a PCIe 5.0 x16 interface, while the Steam Machine GPU has no recorded bus interface.

Clock behavior differs as well. The Steam Machine GPU has a base clock of 1720 MHz, a game clock of 2250 MHz, and a boost clock of 2450 MHz. The MI308X has a base of 1000 MHz and a boost of 2100 MHz, with no game clock listed. The FP32 throughput reflects the architectural intent: the MI308X delivers 81.72 TFLOPS, while the Steam Machine GPU delivers 17.56 TFLOPS. FP16 performance is dramatically different, with the MI308X at 653.7 TFLOPS (8:1 ratio) versus the Steam Machine GPU at 17.56 TFLOPS (1:1 ratio).

Power and physical design also diverge. The MI308X has a TDP of 750 W, uses an OAM Module slot, and requires a suggested PSU of 1150 W, with no power connectors and no display outputs. The Steam Machine GPU has a TDP of 110 W, no listed slot width, no power connectors, and offers two display outputs. The Steam Machine GPU measures 156 mm in length, 152 mm in height, and 162 mm in width. The MI308X has no recorded dimensions.

API support is only listed for the Steam Machine GPU: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The MI308X has no API entries, reinforcing its role as a compute accelerator rather than a gaming card. Release dates also differ, with the MI308X released on December 5, 2023, and the Steam Machine GPU scheduled for June 28, 2026.

The Verdict

The recorded data points to two different purchasing scenarios. The MI308X is a data-center compute accelerator. Its 192 GB HBM3 pool, 10.3 TB/s bandwidth, 19,456 shading units, and 81.72 TFLOPS FP32 make it suitable for large-scale scientific or AI workloads. The absence of ROPs, display outputs, and a zero pixel rate indicate it is not intended for rendering or desktop use. The 750 W TDP and OAM Module form factor further separate it from consumer hardware.

The Steam Machine GPU is a console-oriented graphics processor. Its 28 ray tracing cores, 64 ROPs, 156.8 GPixel/s pixel rate, and 17.56 TFLOPS FP32 align with real-time rendering requirements. The 8 GB GDDR6 and 288.0 GB/s bandwidth are modest but consistent with a compact console design. The 110 W TDP and physical dimensions (156 mm x 152 mm x 162 mm) suggest integration into a small-form-factor device. Its support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 confirms a graphics-first feature set.

For a user building a compute node, the MI308X is the only viable choice from the data. For a console or embedded graphics system, the Steam Machine GPU is the functional option. The two cards do not overlap in purpose, and the benchmark data contains no scores to compare them directly. Both sit at the 50th percentile against all GPUs, but with zero recorded benchmark scores, the percentile values carry no comparative weight.

Specification Differences

The following fields differ between the two products:

• Chip: Aqua Vanjaram (MI308X) vs. Navi 33 (Steam Machine GPU)
• Architecture: CDNA 3.0 vs. RDNA 3.0
• Codename: None vs. Hotpink Bonefish
• Generation: Radeon Instinct (MIx) vs. Console GPU (Valve)
• Process Node: 5 nm vs. 6 nm
• Transistors: 153,000 million vs. 13,300 million
• Die Size: 1017 mm² vs. 204 mm²
• Transistor Density: 150.4M per mm² vs. 65.2M per mm²
• Base Clock: 1000 MHz vs. 1720 MHz
• Boost Clock: 2100 MHz vs. 2450 MHz
• Game Clock: None vs. 2250 MHz
• Memory Clock: 2525 MHz (10.1 Gbps effective) vs. 2250 MHz (18 Gbps effective)
• Memory Size: 192 GB vs. 8 GB
• Memory Type: HBM3 vs. GDDR6
• Memory Bus Width: 8192 bit vs. 128 bit
• Memory Bandwidth: 10.3 TB/s vs. 288.0 GB/s
• Shading Units: 19,456 vs. 1,792
• TMUs: 1,216 vs. 112
• ROPs: 0 vs. 64
• RT Cores: None vs. 28
• Pixel Rate: 0 MPixel/s vs. 156.8 GPixel/s
• Texture Rate: 2,553.6 GTexel/s vs. 274.4 GTexel/s
• FP32: 81.72 TFLOPS vs. 17.56 TFLOPS
• FP16: 653.7 TFLOPS (8:1) vs. 17.56 TFLOPS (1:1)
• TDP: 750 W vs. 110 W
• Slot Width: OAM Module vs. None
• Suggested PSU: 1150 W vs. None
• Bus Interface: PCIe 5.0 x16 vs. None
• Display Outputs: No outputs vs. 1x HDMI 2.1a, 1x DisplayPort 2.1
• APIs: None vs. DirectX 12 Ultimate (12_2), OpenGL 4.6, Vulkan 1.4
• Dimensions: None vs. 156 mm length, 152 mm height, 162 mm width
• Production Status: None vs. Active
• Release Date: December 5, 2023 vs. June 28, 2026
• Predecessor: FirePro Data Center vs. None

The two cards share the AMD manufacturer and TSMC foundry. No other fields match.

Head-to-Head Benchmarks

The database contains no recorded benchmark scores for either card, and the head-to-head benchmark list is empty. Both products show an average benchmark score of 0 and a percentile of 50 against all GPUs. There are no wins attributed to either side, with both winsA and winsB at 0.

Without benchmark results, the measured performance differences must come from the specification sheet. The MI308X leads in raw compute throughput. Its FP32 output of 81.72 TFLOPS is 4.65 times the Steam Machine GPU's 17.56 TFLOPS. In FP16, the gap widens further: the MI308X provides 653.7 TFLOPS versus 17.56 TFLOPS, a 37.2x difference. Texture rate also favors the MI308X, with 2,553.6 GTexel/s against 274.4 GTexel/s, a 9.3x advantage.

Memory bandwidth shows the most extreme divergence. The MI308X delivers 10.3 TB/s, which is 35.8 times the Steam Machine GPU's 288.0 GB/s. The memory size difference is also substantial: 192 GB versus 8 GB, a 24x gap. The MI308X's 8192-bit bus is 64 times wider than the Steam Machine GPU's 128-bit bus.

The Steam Machine GPU wins on clock speeds. Its base clock of 1720 MHz is 72% higher than the MI308X's 1000 MHz. The boost clock of 2450 MHz exceeds the MI308X's 2100 MHz by 16.7%. The Steam Machine GPU also has a game clock of 2250 MHz, which the MI308X lacks entirely. The pixel rate of 156.8 GPixel/s on the Steam Machine GPU is unopposed, as the MI308X has 0 MPixel/s.

The Steam Machine GPU also holds advantages in graphics-specific features. It has 64 ROPs and 28 ray tracing cores, both absent from the MI308X. Its 110 W TDP is 640 W lower than the MI308X's 750 W, which indicates a much lower power draw. The Steam Machine GPU also supports modern graphics APIs, while the MI308X lists no API support.

The release timeline shows the Steam Machine GPU arriving later, with a date of June 28, 2026, versus December 5, 2023 for the MI308X. The production status is active for the Steam Machine GPU, while the MI308X has no production status recorded.

Given the lack of benchmark scores, the performance narrative is entirely derived from these specifications. The MI308X is a compute monster, dominating in throughput, memory capacity, and bandwidth. The Steam Machine GPU is a compact graphics processor, leading in clock rates, pixel output, ray tracing capability, and power efficiency. The data confirms they are not competitors, as their design targets are mutually exclusive.