AMD Radeon Instinct MI308X vs Lisuan Tech LX ULTRA Comparison

FAQ

Q: What are the core specifications of the AMD Radeon Instinct MI308X and the Lisuan Tech LX ULTRA?

A: The AMD Radeon Instinct MI308X uses the Aqua Vanjaram chip on a 5 nm process at TSMC, featuring 153,000 million transistors on a 1017 mm² die. The Lisuan Tech LX ULTRA uses the 7G105 chip on a 6 nm process at TSMC, with transistor count and die size listed as unknown. The MI308X has 19,456 shading units, while the LX ULTRA has 6,144.

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

A: The MI308X has 192 GB of HBM3 memory on an 8192-bit bus, delivering 10.3 TB/s bandwidth. The LX ULTRA has 24 GB of GDDR6 memory on a 192-bit bus, delivering 432.0 GB/s bandwidth. The MI308X's memory bandwidth exceeds the LX ULTRA's by a substantial margin.

Q: What are the respective compute performance figures for FP32 and FP16 workloads?

A: The MI308X delivers 81.72 TFLOPS FP32 and 653.7 TFLOPS FP16 (8:1). The LX ULTRA delivers 24.58 TFLOPS FP32 and 49.15 TFLOPS FP16 (2:1). The MI308X leads in both precision formats.

Q: What are the power requirements for each card?

A: The MI308X has a TDP of 750 W with a suggested PSU of 1150 W. The LX ULTRA has a TDP of 225 W with a suggested PSU of 550 W. The MI308X uses an OAM Module slot width with no power connectors specified, while the LX ULTRA is a dual-slot card using a single 16-pin power connector.

Q: What are the interface and display capabilities of each card?

A: The MI308X uses PCIe 5.0 x16 and has no display outputs. The LX ULTRA uses PCIe 4.0 x16 and has 4x DisplayPort 1.4a outputs. The LX ULTRA supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3, while the MI308X lists no API support.

Q: When were the cards released, and what are their physical dimensions?

A: The MI308X was released on 2023-12-05, while the LX ULTRA was released on 2026-03-16. The LX ULTRA measures 268 mm in length, 112 mm in height, and 40 mm in width. The MI308X has no listed dimensions.

The Verdict

The data indicates a clear split between the two cards based on workload type and physical form factor. The AMD Radeon Instinct MI308X is the compute-dominant option. Its FP32 output of 81.72 TFLOPS is more than triple the 24.58 TFLOPS of the LX ULTRA. Its FP16 output of 653.7 TFLOPS exceeds the LX ULTRA's 49.15 TFLOPS by more than 13 times. The MI308X also holds a commanding lead in memory capacity and bandwidth: 192 GB of HBM3 at 10.3 TB/s versus 24 GB of GDDR6 at 432.0 GB/s. For data-center scale workloads, the MI308X is the only choice from this data.

The Lisuan Tech LX ULTRA is the practical, self-contained alternative. It is a dual-slot card with 4x DisplayPort 1.4a outputs, meaning it can drive displays directly. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.3, which the MI308X does not. Its TDP of 225 W and suggested PSU of 550 W are far lower than the MI308X's 750 W TDP and 1150 W suggested PSU. The LX ULTRA also uses a standard PCIe 4.0 x16 interface and fits within a 268 mm length, with a production status of Active. The MI308X, by contrast, is an OAM Module with no display outputs, no API listings, and no production status.

Benchmark records show no wins for either card, and both sit at the 50th percentile among all GPUs with an average benchmark score of zero. The verdict hinges on the intended use: for raw compute throughput and massive memory pools, the MI308X. For a desktop-capable card with API support and lower power demands, the LX ULTRA.

Head-to-Head Benchmarks

The recorded data contains no head-to-head benchmark entries, so the comparison relies entirely on the specification-level metrics. The largest numerical advantage for the MI308X appears in memory bandwidth: 10.3 TB/s versus 432.0 GB/s, a difference of roughly 23.8 times. In FP16 compute, the MI308X's 653.7 TFLOPS versus 49.15 TFLOPS represents more than a 13-fold lead. In FP32, the MI308X's 81.72 TFLOPS versus 24.58 TFLOPS is a 3.3 times advantage. Texture rate favors the MI308X at 2,553.6 GTexel/s against the LX ULTRA's 384.0 GTexel/s. The LX ULTRA counters in pixel rate: 192.0 GPixel/s versus 0 MPixel/s for the MI308X, which has no ROPs listed and outputs no pixels. The LX ULTRA also leads in API compatibility, with DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.3 supported, while the MI308X lists none.

Specification Differences

The two cards differ across nearly every measured specification. The MI308X uses a 5 nm process; the LX ULTRA uses 6 nm, both at TSMC. The MI308X has 153,000 million transistors on a 1017 mm² die, while the LX ULTRA's transistor count and die size are unknown. The MI308X has 19,456 shading units, 1,216 TMUs, and 0 ROPs. The LX ULTRA has 6,144 shading units, 192 TMUs, and 96 ROPs. The MI308X has no pixel rate (0 MPixel/s) and a texture rate of 2,553.6 GTexel/s. The LX ULTRA has a pixel rate of 192.0 GPixel/s and a texture rate of 384.0 GTexel/s. The MI308X's clocks are listed as 1000 MHz base and 2100 MHz boost, with memory at 2525 MHz (10.1 Gbps effective). The LX ULTRA has no base or boost clock listed, but memory runs at 2250 MHz (18 Gbps effective). The MI308X memory is 192 GB HBM3 on an 8192-bit bus; the LX ULTRA memory is 24 GB GDDR6 on a 192-bit bus. Bandwidth is 10.3 TB/s for the MI308X and 432.0 GB/s for the LX ULTRA. The MI308X TDP is 750 W with a suggested PSU of 1150 W; the LX ULTRA TDP is 225 W with a suggested PSU of 550 W. The MI308X uses an OAM Module slot width and has no power connectors; the LX ULTRA is dual-slot with one 16-pin connector. The MI308X uses PCIe 5.0 x16; the LX ULTRA uses PCIe 4.0 x16. The MI308X has no display outputs; the LX ULTRA has 4x DisplayPort 1.4a. The MI308X lists no API support; the LX ULTRA lists DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3. The MI308X has no listed dimensions; the LX ULTRA is 268 mm long, 112 mm tall, and 40 mm wide. The MI308X released on 2023-12-05; the LX ULTRA released on 2026-03-16. The LX ULTRA is listed as Active in production status; the MI308X has no production status.

Architecture Differences

The MI308X is built on the CDNA 3.0 architecture, designed for compute-oriented data center tasks. The LX ULTRA uses the TrueGPU architecture from the 7G100 generation. The MI308X's memory subsystem is HBM3 with an 8192-bit bus, allowing for the 192 GB capacity and 10.3 TB/s bandwidth. The LX ULTRA uses GDDR6 with a 192-bit bus, yielding 24 GB and 432.0 GB/s. The MI308X has no ROPs, which aligns with its role as a pure compute accelerator with no display path. The LX ULTRA includes 96 ROPs and a pixel rate of 192.0 GPixel/s, indicating a rendering-capable pipeline. The MI308X has no listed RT cores or tensor cores, and neither does the LX ULTRA. The MI308X's FP16 ratio is 8:1 relative to FP32, while the LX ULTRA's is 2:1, indicating different optimization priorities. The MI308X also carries a much larger transistor count and die size, though the LX ULTRA's figures are unknown. The MI308X has no API support listed, while the LX ULTRA supports modern DirectX, OpenGL, and Vulkan versions. The MI308X uses PCIe 5.0 x16, which offers a newer bus generation than the LX ULTRA's PCIe 4.0 x16.

Where Each One Wins

The MI308X wins in compute-intensive, memory-bound workloads. Its FP32 output of 81.72 TFLOPS and FP16 output of 653.7 TFLOPS position it for large-scale numerical processing, AI training, and scientific simulation. Its 192 GB HBM3 memory at 10.3 TB/s bandwidth supports datasets far beyond the LX ULTRA's 24 GB capacity. The MI308X also leads in texture rate at 2,553.6 GTexel/s, which benefits workloads with heavy texturing demands. For environments where PCIe 5.0 connectivity and OAM module form factors are standard, the MI308X fits that infrastructure.

The LX ULTRA wins in workstation and desktop scenarios where display output and API support matter. Its 4x DisplayPort 1.4a outputs and support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.3 make it a functional graphics card for interactive applications. Its 96 ROPs and 192.0 GPixel/s pixel rate enable rendering tasks that the MI308X cannot perform, as the MI308X lists 0 ROPs and 0 MPixel/s. The LX ULTRA also wins on power efficiency: a 225 W TDP versus 750 W, with a suggested PSU of 550 W versus 1150 W. Its dual-slot design and 268 mm length make it physically installable in standard chassis, whereas the MI308X is an OAM Module with no listed dimensions. The LX ULTRA's PCIe 4.0 x16 interface is more common in consumer and workstation motherboards, while the MI308X requires PCIe 5.0 support. The LX ULTRA also has a production status of Active, whereas the MI308X has none listed.