AMD Instinct MI325X vs AMD Steam Deck OLED GPU Comparison

FAQ

Q: What are the two processors compared here?

A: The AMD Instinct MI325X is a server accelerator built on the CDNA 3.0 architecture, while the AMD Steam Deck OLED GPU is a console graphics processor based on RDNA 2.0. Both are manufactured by AMD but target entirely different markets.

Q: How do the memory subsystems differ?

A: The MI325X uses 256 GB of HBM3e memory on an 8192-bit bus, delivering 6.14 TB/s of bandwidth. The Steam Deck OLED GPU uses 16 GB of LPDDR5 on a 128-bit bus, providing 176.0 GB/s. The MI325X has 16 times the memory capacity and roughly 35 times the bandwidth.

Q: What is the transistor count and die size difference?

A: The MI325X packs 153,000 million transistors on a 1017 mm² die using a 5 nm process. The Steam Deck OLED GPU has 2,400 million transistors on a 131 mm² die using a 6 nm process. The MI325X die is about 7.8 times larger in area.

Q: Which processor has higher clock speeds?

A: The MI325X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The Steam Deck OLED GPU also has a 1000 MHz base clock but boosts to only 1600 MHz. The MI325X holds a 500 MHz advantage at boost.

Q: What are the FP32 compute capabilities?

A: The MI325X delivers 81.72 TFLOPS of FP32 performance. The Steam Deck OLED GPU delivers 1.638 TFLOPS. The MI325X is approximately 50 times faster in single-precision floating-point throughput.

Q: Do both support modern graphics APIs?

A: The Steam Deck OLED GPU supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3. The MI325X reports N/A for DirectX, OpenGL, and Vulkan, as it is a compute-focused accelerator with no display outputs.

Architecture Differences

The AMD Instinct MI325X and the AMD Steam Deck OLED GPU represent two distinct branches of AMD's graphics roadmap. The MI325X uses the CDNA 3.0 architecture, designed for data center compute workloads, while the Steam Deck OLED GPU uses RDNA 2.0, aimed at power-efficient gaming in a handheld console.

The process nodes differ significantly. The MI325X is fabricated on a 5 nm process at TSMC, while the Steam Deck OLED GPU uses a 6 nm process. This contributes to a massive difference in transistor density: the MI325X achieves 150.4 million transistors per mm², compared to 18.3 million per mm² for the Steam Deck chip. The MI325X die size is 1017 mm² versus 131 mm², and the transistor count is 153,000 million versus 2,400 million.

Shader resources are orders of magnitude apart. The MI325X has 19,456 shading units and 1,216 texture mapping units (TMUs). The Steam Deck OLED GPU has 512 shading units and 32 TMUs. The MI325X reports zero ROPs and zero pixel rate, reflecting its lack of rasterization hardware. The Steam Deck OLED GPU has 16 ROPs and a pixel rate of 25.60 GPixel/s.

Memory architecture is fundamentally different. The MI325X uses HBM3e with a 8192-bit bus, while the Steam Deck OLED GPU uses LPDDR5 on a 128-bit bus. The MI325X has no display outputs, while the Steam Deck OLED GPU provides one USB Type-C port.

Thermal design power is another differentiator: the MI325X is rated at 1000 W with a suggested PSU of 1400 W, while the Steam Deck OLED GPU operates at 15 W. The MI325X is an OAM module with no power connectors listed, while the Steam Deck OLED GPU has no separate power connector data.

Head-to-Head Benchmarks

The recorded benchmark data shows no direct head-to-head results between these two processors. The wins tally is zero for each, and the nearest rivals lists are empty for both. The average benchmark score for each is 0, and both sit at the 50th percentile among all GPUs in the database.

This absence of comparative benchmarks makes sense given the intended use cases. The MI325X is a compute accelerator with no display outputs, no graphics API support, and no pixel rate. It cannot run traditional graphics benchmarks. The Steam Deck OLED GPU is a consumer console chip with full DirectX 12 Ultimate support, Vulkan 1.3, and OpenGL 4.6.

Theoretical compute figures can be compared instead. The MI325X delivers 81.72 TFLOPS FP32 and the same 81.72 TFLOPS FP16 with a 1:1 ratio. The Steam Deck OLED GPU delivers 1.638 TFLOPS FP32 and 3.277 TFLOPS FP16 with a 2:1 ratio. In FP32, the MI325X is roughly 50 times faster. In FP16, the MI325X is about 25 times faster.

Texture rates show a similar gap. The MI325X achieves 2,553.6 GTexel/s, while the Steam Deck OLED GPU manages 51.20 GTexel/s. That is a 50-fold difference. The MI325X pixel rate is 0 MPixel/s, while the Steam Deck OLED GPU produces 25.60 GPixel/s, a category where the console chip is the only functional unit.

Memory bandwidth is 6.14 TB/s for the MI325X versus 176.0 GB/s for the Steam Deck OLED GPU. The MI325X leads by a factor of roughly 35. The Steam Deck OLED GPU draws 15 W of power, while the MI325X draws 1000 W. Efficiency per watt strongly favors the console chip, but absolute throughput strongly favors the accelerator.

The Verdict

The data indicates these two processors are not competitors in any practical sense. The MI325X is a data center compute accelerator with no graphics output, no rasterization hardware, and no consumer API support. The Steam Deck OLED GPU is a low-power console chip designed for portable gaming with full graphics API compatibility.

For compute workloads that require massive FP32 or FP16 throughput, the MI325X is the only choice. Its 81.72 TFLOPS FP32, 6.14 TB/s memory bandwidth, and 256 GB HBM3e capacity are unmatched by the Steam Deck OLED GPU's 1.638 TFLOPS and 176.0 GB/s. The MI325X also offers 1,216 TMUs versus 32, and a texture rate of 2,553.6 GTexel/s versus 51.20 GTexel/s.

For graphics rendering and gaming, the Steam Deck OLED GPU is the functional option. It supports DirectX 12 Ultimate, Vulkan 1.3, and OpenGL 4.6, while the MI325X reports N/A for all three. The Steam Deck OLED GPU has a pixel rate of 25.60 GPixel/s and 16 ROPs, while the MI325X has zero ROPs and zero pixel rate.

The Steam Deck OLED GPU also wins on power efficiency. At 15 W TDP, it delivers usable graphics performance for a handheld device. The MI325X requires 1000 W and a 1400 W suggested PSU, making it unsuitable for any consumer form factor. The Steam Deck OLED GPU is in production and physically sized at 298 mm by 117 mm by 49 mm, while the MI325X is an OAM module with no listed dimensions.

Specification Differences

The following fields differ between the two processors:

• Architecture: CDNA 3.0 (MI325X) versus RDNA 2.0 (Steam Deck OLED GPU)
• Chip: Aqua Vanjaram versus Sephiroth
• Generation: Instinct (MIx) versus Console GPU (Valve)
• Process Node: 5 nm versus 6 nm
• Transistors: 153,000 million versus 2,400 million
• Die Size: 1017 mm² versus 131 mm²
• Transistor Density: 150.4M / mm² versus 18.3M / mm²
• Boost Clock: 2100 MHz versus 1600 MHz
• Memory Clock: 1500 MHz 6 Gbps effective versus 1375 MHz 11 Gbps effective
• Memory Size: 256 GB versus 16 GB
• Memory Type: HBM3e versus LPDDR5
• Memory Bus Width: 8192 bit versus 128 bit
• Memory Bandwidth: 6.14 TB/s versus 176.0 GB/s
• Shading Units: 19,456 versus 512
• TMUs: 1,216 versus 32
• ROPs: 0 versus 16
• RT Cores: null versus 8
• Pixel Rate: 0 MPixel/s versus 25.60 GPixel/s
• Texture Rate: 2,553.6 GTexel/s versus 51.20 GTexel/s
• FP32: 81.72 TFLOPS versus 1.638 TFLOPS
• FP16: 81.72 TFLOPS (1:1) versus 3.277 TFLOPS (2:1)
• TDP: 1000 W versus 15 W
• Slot Width: OAM Module versus null
• Power Connectors: None versus null
• Suggested PSU: 1400 W versus null
• Bus Interface: PCIe 5.0 x16 versus null
• Display Outputs: No outputs versus 1x USB Type-C
• DirectX: N/A versus 12 Ultimate (12_2)
• OpenGL: N/A versus 4.6
• Vulkan: N/A versus 1.3
• Dimensions: null versus 298 mm x 117 mm x 49 mm
• Production Status: null versus Active
• Release Date: 2024-10-09 versus 2023-11-08

Where Each One Wins

AMD Instinct MI325X wins in compute throughput. The FP32 figure of 81.72 TFLOPS dwarfs the Steam Deck OLED GPU's 1.638 TFLOPS. The FP16 throughput of 81.72 TFLOPS (1:1) exceeds the Steam Deck's 3.277 TFLOPS (2:1). The texture rate of 2,553.6 GTexel/s is 50 times the Steam Deck's 51.20 GTexel/s.

AMD Instinct MI325X wins in memory capacity and bandwidth. The 256 GB HBM3e pool with 6.14 TB/s bandwidth enables working sets that are impossible on the Steam Deck's 16 GB LPDDR5 at 176.0 GB/s. The 8192-bit bus is 64 times wider than the Steam Deck's 128-bit bus.

AMD Steam Deck OLED GPU wins in graphics rendering. It has 16 ROPs and a 25.60 GPixel/s pixel rate, while the MI325X has zero ROPs and zero pixel rate. The Steam Deck supports DirectX 12 Ultimate, Vulkan 1.3, and OpenGL 4.6, while the MI325X has no API support.

AMD Steam Deck OLED GPU wins in power efficiency and form factor. The 15 W TDP allows operation in a handheld device, while the 1000 W TDP of the MI325X requires a 1400 W suggested PSU. The Steam Deck has a physical size of 298 mm by 117 mm by 49 mm, while the MI325X is an OAM module with no consumer-friendly dimensions.

AMD Steam Deck OLED GPU wins in production status. It is listed as Active, while the MI325X has no production status recorded. The Steam Deck also has a release date of 2023-11-08, earlier than the MI325X's 2024-10-09.

AMD Instinct MI325X wins in shader resources. The 19,456 shading units and 1,216 TMUs provide massive parallel compute capacity. The Steam Deck's 512 shading units and 32 TMUs are sufficient for gaming at portable resolutions but cannot approach the accelerator's raw throughput.