AMD Instinct MI455X vs Lisuan Tech LX ULTRA Comparison

FAQ

Q: What are the architectural generations of the AMD Instinct MI455X and Lisuan Tech LX ULTRA?

A: The AMD Instinct MI455X uses the CDNA 5.0 architecture, while the Lisuan Tech LX ULTRA uses the TrueGPU architecture.

Q: How do the memory capacities compare between the two cards?

A: The AMD Instinct MI455X features 432 GB of HBM4 memory, whereas the Lisuan Tech LX ULTRA features 24 GB of GDDR6 memory.

Q: What is the difference in process node size?

A: The AMD Instinct MI455X is built on a 2 nm process at TSMC, while the Lisuan Tech LX ULTRA is built on a 6 nm process at TSMC.

Q: Which card has a higher FP32 compute capability?

A: The AMD Instinct MI455X delivers 157.3 TFLOPS of FP32 performance, compared to the Lisuan Tech LX ULTRA's 24.58 TFLOPS.

Q: What are the power requirements for each card?

A: The AMD Instinct MI455X has a TDP of 2300 W and a suggested PSU of 2700 W, while the Lisuan Tech LX ULTRA has a TDP of 225 W and a suggested PSU of 550 W.

Q: Do these cards support standard display outputs?

A: The AMD Instinct MI455X has no display outputs, while the Lisuan Tech LX ULTRA includes 4x DisplayPort 1.4a outputs.

Architecture Differences

The AMD Instinct MI455X and Lisuan Tech LX ULTRA diverge sharply at nearly every architectural layer. The MI455X is built on CDNA 5.0, AMD's compute-focused architecture, fabricated on a 2 nm TSMC process. The LX ULTRA uses the TrueGPU architecture on a 6 nm TSMC process. The MI455X packs a massive MI450 256CU chip with 320,000 million transistors on a 2990 mm² die, yielding a transistor density of 107.0M per mm². The LX ULTRA's 7G105 chip has an unknown transistor count and die size, but its 6 nm node places it in an entirely different integration class.

Compute resource counts reveal the scale of the gap. The MI455X contains 32,768 shading units, 1,024 TMUs, and no ROPs, reflecting its compute-accelerator role. The LX ULTRA contains 6,144 shading units, 192 TMUs, and 96 ROPs, a conventional graphics-oriented configuration. The MI455X reports a pixel rate of 0 MPixel/s and a texture rate of 2,457.6 GTexel/s. The LX ULTRA reports a pixel rate of 192.0 GPixel/s and a texture rate of 384.0 GTexel/s. Neither card lists ray tracing or tensor core counts in the database.

Memory architecture reinforces the split. The MI455X uses 432 GB of HBM4 across a 24,576-bit bus, delivering 23.3 TB/s of bandwidth, with memory clocked at 1900 MHz (7.6 Gbps effective). The LX ULTRA uses 24 GB of GDDR6 across a 192-bit bus, delivering 432.0 GB/s, with memory clocked at 2250 MHz (18 Gbps effective). The MI455X operates at a 1000 MHz base and 2400 MHz boost, while the LX ULTRA has no recorded base or boost clocks. The MI455X connects via PCIe 6.0 x16, the LX ULTRA via PCIe 4.0 x16.

API support separates them further. The MI455X lists DirectX, OpenGL, and Vulkan as N/A, aligning with its no-display-output design. The LX ULTRA supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3. Physical design differs accordingly: the MI455X is an EAM Module with no power connectors, while the LX ULTRA is a dual-slot card with a 1x 16-pin connector, measuring 268 mm by 112 mm by 40 mm.

Head-to-Head Benchmarks

The benchmark database contains no recorded head-to-head benchmark entries for these two products. Both cards have an average benchmark score of 0 and a percentile versus all GPUs of 50. The wins counter shows 0 for either side. This absence of measured results means the comparison must rely on the recorded specification fields, which themselves establish a clear functional separation.

The FP32 compute figures provide the most direct numeric comparison. The MI455X delivers 157.3 TFLOPS, which is 6.4 times the LX ULTRA's 24.58 TFLOPS. In FP16, the MI455X again delivers 157.3 TFLOPS with a 1:1 ratio, while the LX ULTRA delivers 49.15 TFLOPS with a 2:1 ratio. The MI455X therefore leads in FP16 as well, at a 3.2 times advantage. These ratios come directly from the recorded values: 157.3 divided by 24.58 equals 6.4, and 157.3 divided by 49.15 equals 3.2.

Memory bandwidth shows the largest relative gap. The MI455X's 23.3 TB/s compares to the LX ULTRA's 432.0 GB/s, a difference of roughly 54 times. The MI455X also holds a 17.9 times advantage in texture rate: 2,457.6 GTexel/s versus 384.0 GTexel/s. The LX ULTRA counters in pixel throughput, recording 192.0 GPixel/s against the MI455X's 0 MPixel/s, a category where the MI455X cannot participate by design.

Power consumption inverts the performance relationship. The MI455X draws 2300 W with a suggested 2700 W PSU. The LX ULTRA draws 225 W with a suggested 550 W PSU, meaning the LX ULTRA operates at roughly one-tenth the TDP. Physical footprint also differs: the MI455X is an EAM Module with no specified dimensions, while the LX ULTRA occupies a standard dual-slot profile.

Specification Differences

| Specification | AMD Instinct MI455X | Lisuan Tech LX ULTRA |

|----------------|---------------------|----------------------|

| Architecture | CDNA 5.0 | TrueGPU |

| Generation | Instinct (MIx) | 7G100 |

| Process Node | 2 nm | 6 nm |

| Foundry | TSMC | TSMC |

| Transistors | 320,000 million | unknown |

| Die Size | 2990 mm² | unknown |

| Transistor Density | 107.0M / mm² | null |

| Base Clock | 1000 MHz | null |

| Boost Clock | 2400 MHz | null |

| Memory Clock | 1900 MHz 7.6 Gbps effective | 2250 MHz 18 Gbps effective |

| Memory Size | 432 GB | 24 GB |

| Memory Type | HBM4 | GDDR6 |

| Memory Bus Width | 24576 bit | 192 bit |

| Memory Bandwidth | 23.3 TB/s | 432.0 GB/s |

| Shading Units | 32768 | 6144 |

| TMUs | 1024 | 192 |

| ROPs | 0 | 96 |

| Pixel Rate | 0 MPixel/s | 192.0 GPixel/s |

| Texture Rate | 2,457.6 GTexel/s | 384.0 GTexel/s |

| FP32 | 157.3 TFLOPS | 24.58 TFLOPS |

| FP16 | 157.3 TFLOPS (1:1) | 49.15 TFLOPS (2:1) |

| TDP | 2300 W | 225 W |

| Slot Width | EAM Module | Dual-slot |

| Power Connectors | None | 1x 16-pin |

| Suggested PSU | 2700 W | 550 W |

| Bus Interface | PCIe 6.0 x16 | PCIe 4.0 x16 |

| Display Outputs | No outputs | 4x DisplayPort 1.4a |

| DirectX | N/A | 12 Ultimate (12_2) |

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.3 |

| Dimensions | null | 268 mm 10.6 inches, 112 mm 4.4 inches, 40 mm 1.6 inches |

| Production Status | null | Active |

| Release Date | 2026-07-22 | 2026-03-16 |

The two cards share only their foundry (TSMC), their null launch MSRP, their null average benchmark score, and their 50th percentile ranking among all GPUs. Every other recorded field differs.

The Verdict

The recorded data draws a clear line between these two products. The AMD Instinct MI455X is a compute accelerator with no display path, no graphics API support, and an enormous memory and compute envelope: 432 GB of HBM4, 23.3 TB/s of bandwidth, and 157.3 TFLOPS in both FP32 and FP16. Its 2300 W TDP and EAM Module form factor place it in data-center or specialized compute environments, not desktop systems. The Lisuan Tech LX ULTRA is a conventional graphics card with 24 GB of GDDR6, 24.58 TFLOPS of FP32, a 192.0 GPixel/s pixel rate, four DisplayPort outputs, full DirectX 12 Ultimate support, and a 225 W TDP in a dual-slot package.

The absence of head-to-head benchmark results means no measured performance comparison exists in the database. The specification fields, however, indicate that the MI455X dominates in raw compute and memory bandwidth, while the LX ULTRA is the only one of the two with any graphics output capability. The MI455X's FP32 score is 6.4 times higher, its FP16 score is 3.2 times higher, and its memory bandwidth is roughly 54 times higher. The LX ULTRA's pixel rate of 192.0 GPixel/s has no counterpart in the MI455X, which records 0 MPixel/s.

Neither card has a recorded launch MSRP, so no price-based assessment is possible. The release dates differ by about four months: the LX ULTRA launched on 2026-03-16, and the MI455X on 2026-07-22. The LX ULTRA has an active production status, while the MI455X's production status is not recorded.

Where Each One Wins

The AMD Instinct MI455X wins in every compute and memory category recorded in the database. It leads in FP32 compute with 157.3 TFLOPS versus 24.58 TFLOPS, in FP16 compute with 157.3 TFLOPS versus 49.15 TFLOPS, in texture rate with 2,457.6 GTexel/s versus 384.0 GTexel/s, and in memory bandwidth with 23.3 TB/s versus 432.0 GB/s. Its 432 GB of HBM4 memory versus 24 GB of GDDR6 gives it a 17.9 times capacity advantage. The MI455X also uses a newer PCIe interface, PCIe 6.0 x16 versus PCIe 4.0 x16, and a newer process node, 2 nm versus 6 nm. Its 2300 W TDP indicates a power envelope suited to installations with dedicated cooling and power infrastructure.

The Lisuan Tech LX ULTRA wins in all graphics-oriented and practical deployment categories. It has a pixel rate of 192.0 GPixel/s, where the MI455X records 0 MPixel/s. It provides four DisplayPort 1.4a outputs, while the MI455X offers no display outputs. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.3, while the MI455X lists all three as N/A. Its 225 W TDP is dramatically lower than the MI455X's 2300 W, and its suggested PSU of 550 W contrasts with the MI455X's 2700 W. The LX ULTRA is a dual-slot card with a 1x 16-pin power connector and recorded dimensions of 268 mm by 112 mm by 40 mm, fitting standard desktop chassis layouts. The MI455X, as an EAM Module with no power connectors, requires a different integration path.

The use-case split follows directly from these fields. The MI455X targets workloads where FP32 and FP16 throughput and memory bandwidth dominate, with no requirement for graphical output. The LX ULTRA targets systems that need rasterization, display connectivity, and standard graphics API support within a conventional power budget. The database shows no overlap in their functional strengths, and the benchmark results, currently empty for both, will be needed to quantify real-world performance in their respective domains.