AMD Instinct MI355X vs Lisuan Tech LX ULTRA Comparison

The AMD Instinct MI355X and the Lisuan Tech LX ULTRA occupy entirely different corners of the hardware spectrum. The MI355X is a massive compute accelerator built for data centers, while the LX ULTRA is a conventional consumer graphics card. Direct competition is minimal, but the recorded data reveals a clear performance hierarchy. The MI355X delivers 78.64 TFLOPS of FP32 compute, more than three times the 24.58 TFLOPS of the LX ULTRA. In FP16, the gap widens further: the MI355X delivers 78.64 TFLOPS at a 1:1 ratio, whereas the LX ULTRA reaches 49.15 TFLOPS through a 2:1 rate. The MI355X also holds an enormous memory advantage with 288 GB of HBM3e across an 8192-bit bus, yielding 8.19 TB/s of bandwidth. The LX ULTRA uses 24 GB of GDDR6 on a 192-bit bus for 432.0 GB/s. These are not comparable products, and the data reflects a fundamental division in purpose and scale.

Head-to-Head Benchmarks

The recorded head-to-head benchmark array is empty. Neither the MI355X nor the LX ULTRA has reported benchmark scores in the database, and both hold a percentile rank of 50 against all GPUs. This percentile value indicates median placement, but with an average benchmark score of 0 for both, the percentile is a placeholder rather than a measured result. Without direct benchmark data, the analysis must rely on the technical specifications recorded in the database.

The FP32 compute figures provide the clearest numerical comparison. The MI355X reaches 78.64 TFLOPS, while the LX ULTRA produces 24.58 TFLOPS. The MI355X is 3.2 times faster in raw single-precision throughput. That is a decisive margin, roughly 220% higher than the LX ULTRA. In FP16, the MI355X retains its 78.64 TFLOPS due to the 1:1 ratio, while the LX ULTRA doubles its FP32 rate to 49.15 TFLOPS. Even with that advantage, the MI355X still leads by about 60%.

Texture processing follows a similar pattern. The MI355X achieves 2,457.6 GTexel/s with 1024 texture mapping units. The LX ULTRA manages 384.0 GTexel/s from 192 texture mapping units. The MI355X is 6.4 times faster in texture fill rate. Pixel throughput is a different story. The MI355X records 0 MPixel/s and has no ROPs (0), which is consistent with its design as a compute accelerator without a traditional rasterization pipeline. The LX ULTRA, by contrast, reaches 192.0 GPixel/s with 96 ROPs. In pixel processing, the LX ULTRA is the only one of the two with any capability at all.

Memory bandwidth is another area of overwhelming MI355X superiority. The 8.19 TB/s of the MI355X is roughly 19 times the 432.0 GB/s of the LX ULTRA. The memory bus width difference is stark as well: 8192 bit versus 192 bit. The MI355X carries 288 GB of HBM3e, while the LX ULTRA has 24 GB of GDDR6. The MI355X memory clock is recorded as 2000 MHz with 8 Gbps effective, while the LX ULTRA memory runs at 2250 MHz with 18 Gbps effective. The LX ULTRA's faster GDDR6 signaling does not compensate for the vastly wider HBM3e interface.

FAQ

Q: Which GPU has more FP32 compute power?

A: The AMD Instinct MI355X. It delivers 78.64 TFLOPS FP32, while the Lisuan Tech LX ULTRA delivers 24.58 TFLOPS. This makes the MI355X roughly 3.2 times faster in single-precision throughput.

Q: How do the memory subsystems compare?

A: The MI355X uses 288 GB of HBM3e on an 8192-bit bus with 8.19 TB/s bandwidth. The LX ULTRA uses 24 GB of GDDR6 on a 192-bit bus with 432.0 GB/s bandwidth. The MI355X has 19 times the memory bandwidth and 12 times the memory capacity.

Q: Does the LX ULTRA have any performance advantage over the MI355X?

A: Yes, in pixel processing and graphics API support. The LX ULTRA records 192.0 GPixel/s pixel rate with 96 ROPs, while the MI355X records 0 MPixel/s and has 0 ROPs. The LX ULTRA also supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.3, while the MI355X has no graphics APIs listed.

Q: What are the power requirements for each?

A: The MI355X has a TDP of 1400 W and requires a suggested PSU of 1800 W. It uses an OAM module slot width and has no power connectors, meaning it draws power through the module interface. The LX ULTRA has a TDP of 225 W, uses a single 16-pin power connector, and requires a suggested PSU of 550 W.

Q: What process nodes do the two chips use?

A: The AMD Instinct MI355X is built on a 3 nm process at TSMC with 185,000 million transistors on a 2380 mm² die. The Lisuan Tech LX ULTRA is built on a 6 nm process at TSMC, though its transistor count and die size are listed as unknown in the database.

Q: Which GPU has more shading units?

A: The MI355X has 16,384 shading units, while the LX ULTRA has 6,144. The MI355X also has 1024 TMUs versus 192 TMUs on the LX ULTRA.

Where Each One Wins

The AMD Instinct MI355X wins decisively in compute workloads. Its 78.64 TFLOPS FP32 and 78.64 TFLOPS FP16 put it in a different class from the LX ULTRA. For scientific simulation, AI training, or any workload that relies on dense matrix math, the MI355X is the clear choice. The 288 GB of HBM3e memory with 8.19 TB/s bandwidth allows it to hold and process datasets that would be impossible on the LX ULTRA's 24 GB GDDR6 frame buffer. The texture rate of 2,457.6 GTexel/s also indicates strong capability in texture-heavy compute tasks, though this is secondary to the raw FP32 and memory bandwidth advantages. The MI355X is designed as a compute accelerator, and the data confirms that focus.

The Lisuan Tech LX ULTRA wins in traditional graphics rendering. It delivers 192.0 GPixel/s pixel rate, a capability the MI355X entirely lacks. The MI355X has no ROPs and no display outputs, while the LX ULTRA provides 4x DisplayPort 1.4a outputs. The LX ULTRA also supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3, making it functional for gaming and workstation graphics. The MI355X lists no graphics APIs at all. For any use case that requires a display output, the LX ULTRA is the only option between the two. Its 225 W TDP is also far more manageable than the 1400 W requirement of the MI355X, and it fits in a standard dual-slot form factor with a 1x 16-pin power connector.

The LX ULTRA also wins on integration practicality. It uses PCIe 4.0 x16, while the MI355X uses PCIe 5.0 x16. The LX ULTRA measures 268 mm in length, 112 mm in height, and 40 mm in width, fitting a conventional chassis. The MI355X is an OAM Module, a form factor intended for server racks rather than desktop systems. The LX ULTRA is listed as Active in production status, while the MI355X has no production status recorded.

Specification Differences

The two GPUs differ in nearly every recorded specification. The MI355X uses the MI350 256CU chip with CDNA 4.0 architecture. The LX ULTRA uses the 7G105 chip with TrueGPU architecture. The process nodes differ: 3 nm for the MI355X versus 6 nm for the LX ULTRA, both fabricated at TSMC. The MI355X has 185,000 million transistors on a 2380 mm² die, while the LX ULTRA has unknown transistor count and die size. The transistor density of the MI355X is 77.7M per mm², a figure not available for the LX ULTRA.

Clock speeds differ significantly. The MI355X has a base clock of 1000 MHz and a boost clock of 2400 MHz. The LX ULTRA has no base or boost clock recorded. Memory clocks differ as well: 2000 MHz with 8 Gbps effective for the MI355X, 2250 MHz with 18 Gbps effective for the LX ULTRA. The MI355X uses HBM3e memory with 288 GB capacity, 8192-bit bus width, and 8.19 TB/s bandwidth. The LX ULTRA uses GDDR6 with 24 GB capacity, 192-bit bus width, and 432.0 GB/s bandwidth.

Compute unit counts differ: 16,384 shading units, 1024 TMUs, and 0 ROPs for the MI355X; 6,144 shading units, 192 TMUs, and 96 ROPs for the LX ULTRA. The MI355X records 0 MPixel/s pixel rate and 2,457.6 GTexel/s texture rate. The LX ULTRA records 192.0 GPixel/s pixel rate and 384.0 GTexel/s texture rate. FP32 is 78.64 TFLOPS for the MI355X and 24.58 TFLOPS for the LX ULTRA. FP16 is 78.64 TFLOPS at 1:1 for the MI355X and 49.15 TFLOPS at 2:1 for the LX ULTRA.

Power and physical specifications also diverge. The MI355X has a TDP of 1400 W, a suggested PSU of 1800 W, an OAM Module slot width, and no power connectors. The LX ULTRA has a TDP of 225 W, a suggested PSU of 550 W, a dual-slot width, and a 1x 16-pin power connector. The MI355X uses PCIe 5.0 x16, while the LX ULTRA uses PCIe 4.0 x16. The MI355X has no display outputs, while the LX ULTRA has 4x DisplayPort 1.4a. The MI355X is 102 mm long and 165 mm wide, while the LX ULTRA is 268 mm long, 112 mm high, and 40 mm wide. The MI355X lists no graphics API support, while the LX ULTRA supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.3.

Architecture Differences

The architectural split between these two is fundamental. The AMD Instinct MI355X uses CDNA 4.0, an architecture explicitly designed for compute acceleration. It belongs to the Instinct (MIx) generation and has the predecessor Radeon Instinct. The chip is the MI350 with 256 compute units. Its massive 2380 mm² die, built on TSMC 3 nm, holds 185,000 million transistors. The 16,384 shading units and 1024 TMUs feed a compute pipeline that has no rasterization hardware, as shown by the 0 ROPs and 0 MPixel/s pixel rate. The 1:1 FP16 ratio means the FP16 throughput matches FP32, a design choice that prioritizes consistent compute performance across precision formats. The memory system uses HBM3e, which provides the 8.19 TB/s bandwidth necessary for large-scale compute workloads. The lack of display outputs and graphics API support confirms that CDNA 4.0 is not intended for rendering to a screen.

The Lisuan Tech LX ULTRA uses the TrueGPU architecture on the 7G105 chip, part of the 7G100 generation. It is built on TSMC 6 nm, a less advanced node than the MI355X. Its 6,144 shading units and 192 TMUs feed a traditional rasterization pipeline with 96 ROPs, capable of 192.0 GPixel/s. The 2:1 FP16 ratio indicates that the hardware doubles the FP32 rate for half-precision work, a typical consumer GPU design. The GDDR6 memory on a 192-bit bus provides 432.0 GB/s, sufficient for graphics workloads but far below the MI355X. The LX ULTRA supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.3, and it has 4x DisplayPort 1.4a outputs. The dual-slot form factor, 225 W TDP, and PCIe 4.0 x16 interface position it as a conventional add-in card. Its production status is Active, and its release date is recorded as 2026-03-16, later than the MI355X release date of 2025-06-11.

The transistor counts tell a story of scale. The MI355X packs 185,000 million transistors, while the LX ULTRA has an unknown count. The MI355X die is 2380 mm², one of the largest recorded in the database. The LX ULTRA die size is unknown. The process node difference, 3 nm versus 6 nm, contributes to the MI355X's density advantage of 77.7M transistors per mm². The architectures serve different masters: CDNA 4.0 for raw compute throughput and memory capacity, TrueGPU for rasterization and display output. The data shows no overlap in their intended use cases.