NVIDIA H800 SXM5 vs Lisuan Tech LX ULTRA Comparison

Where Each One Wins

The recorded data separates these two accelerators into distinctly different roles. The NVIDIA H800 SXM5 is a server-class compute module built around the Hopper architecture, while the Lisuan Tech LX ULTRA is a dual-slot add-in card with display outputs and consumer-oriented API support. The H800 SXM5 has no display outputs, which marks it exclusively for headless compute environments, whereas the LX ULTRA provides four DisplayPort 1.4a outputs, indicating it can drive displays directly.

From a memory standpoint, the H800 SXM5 delivers 80 GB of HBM3 across a 5120-bit bus, producing 3.36 TB/s of bandwidth. The LX ULTRA uses 24 GB of GDDR6 on a 192-bit bus, yielding 432.0 GB/s. The bandwidth gap is enormous, over 7.7 times in favor of the H800 SXM5. This makes the H800 SXM5 the clear choice for workloads that stream large datasets, such as large language model inference, scientific simulation, or any memory-bound kernel where data movement dominates execution time.

The LX ULTRA counters with a much higher pixel rate: 192.0 GPixel/s versus 42.12 GPixel/s for the H800 SXM5. It also supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3, while the H800 SXM5 lists no API support in the database. This positions the LX ULTRA for graphics rendering, rasterization, and any workload that relies on standard graphics APIs. The H800 SXM5 has no such capabilities recorded.

In raw compute throughput, the H800 SXM5 leads in FP32 at 59.30 TFLOPS versus 24.58 TFLOPS for the LX ULTRA. It also leads in FP16 at 237.2 TFLOPS (4:1) versus 49.15 TFLOPS (2:1). Texture rate favors the H800 SXM5 at 926.6 GTexel/s versus 384.0 GTexel/s. However, the LX ULTRA's higher pixel rate and larger ROP count (96 versus 24) suggest it is better suited for fill-rate-bound graphics work, while the H800 SXM5's compute and bandwidth advantages target dense numerical workloads.

Power draws differ substantially: the H800 SXM5 has a 700 W TDP with an 8-pin EPS connector and a suggested 1100 W PSU, while the LX ULTRA has a 225 W TDP with a single 16-pin connector and a suggested 550 W PSU. The LX ULTRA is thus far lighter on power infrastructure requirements, making it easier to deploy in conventional workstation or small-server chassis.

Architecture Differences

The H800 SXM5 uses the GH100 chip built on a 5 nm TSMC process with 80,000 million transistors on an 814 mm² die. The LX ULTRA uses the 7G105 chip on a 6 nm TSMC process, with transistor count and die size listed as unknown. The H800 SXM5's transistor density is 98.3M per mm², a figure the LX ULTRA cannot match given its unknown die dimensions.

The H800 SXM5 is a PCIe 5.0 x16 module, while the LX ULTRA uses PCIe 4.0 x16. The newer bus standard on the H800 SXM5 provides a faster host interface, though the LX ULTRA's interface remains adequate for many data transfers. The H800 SXM5 is an SXM module, not a slot card, while the LX ULTRA is dual-slot with physical dimensions of 268 mm length, 112 mm height, and 40 mm width.

Shading unit counts differ sharply: the H800 SXM5 has 16,896 shading units, 528 TMUs, and 24 ROPs. The LX ULTRA has 6,144 shading units, 192 TMUs, and 96 ROPs. The H800 SXM5 carries 528 tensor cores, while the LX ULTRA has no tensor core count recorded. This indicates the H800 SXM5 is built for tensor-heavy operations such as matrix multiplication for neural networks, whereas the LX ULTRA has no such specialized hardware in the database.

The H800 SXM5's memory runs at 1313 MHz with 5.3 Gbps effective data rate, while the LX ULTRA's GDDR6 runs at 2250 MHz with 18 Gbps effective. The H800 SXM5's HBM3 stack provides far higher total bandwidth due to the 5120-bit bus, despite the lower per-pin rate. The LX ULTRA's 192-bit bus limits it to 432.0 GB/s regardless of the higher memory clock.

The H800 SXM5's clock speeds are recorded: base at 1095 MHz, boost at 1755 MHz. The LX ULTRA has no base or boost clock listed. The H800 SXM5's FP16 throughput is listed as 4:1 ratio, meaning it achieves 237.2 TFLOPS with a 4:1 instruction ratio, while the LX ULTRA's FP16 is 2:1 at 49.15 TFLOPS. This indicates the H800 SXM5's FP16 capability is designed for tensor operations with packed math, while the LX ULTRA's FP16 is more conventional.

The H800 SXM5 has no display outputs, no DirectX, OpenGL, or Vulkan support listed. The LX ULTRA has full API support including DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3. The LX ULTRA also has four DisplayPort 1.4a outputs. These architectural differences define the two products: the H800 SXM5 is a pure compute accelerator, the LX ULTRA is a graphics-capable card.

Head-to-Head Benchmarks

The database shows no direct head-to-head benchmark entries for these two devices, and neither has individual benchmark scores recorded. Both share a 50th percentile ranking against all GPUs, and both have an average benchmark score of zero in the recorded data. This means the comparison must rely on the specification-level measurements available.

The largest single advantage for the H800 SXM5 is memory bandwidth. At 3.36 TB/s versus 432.0 GB/s, the H800 SXM5 delivers roughly 7.8 times the bandwidth of the LX ULTRA. For any workload that is memory-bound, this gap will dominate performance. Large matrix operations, deep learning training batches, and data-intensive scientific codes all depend on moving data into compute units quickly, and the H800 SXM5's HBM3 implementation does so at a far higher rate.

The H800 SXM5 also leads in FP32 compute: 59.30 TFLOPS versus 24.58 TFLOPS, a 2.4 times advantage. In FP16, the H800 SXM5 reaches 237.2 TFLOPS (4:1) versus 49.15 TFLOPS (2:1), a 4.8 times advantage. Texture rate is 926.6 GTexel/s versus 384.0 GTexel/s, a 2.4 times lead. These figures indicate that the H800 SXM5 is substantially faster for general compute and especially for tensor-accelerated workloads, given its 528 tensor cores against none recorded for the LX ULTRA.

The LX ULTRA leads in pixel rate: 192.0 GPixel/s versus 42.12 GPixel/s, a 4.6 times advantage. This comes from its 96 ROPs versus 24 on the H800 SXM5. For rasterization, depth testing, and framebuffer operations, the LX ULTRA is clearly the stronger device. Its 4.6 times higher pixel throughput suggests it can handle high-resolution rendering or high refresh-rate output far better than the H800 SXM5.

Memory capacity favors the H800 SXM5 with 80 GB versus 24 GB, a 3.3 times difference. This allows the H800 SXM5 to hold larger models or datasets in memory without spilling to host memory. The LX ULTRA's 24 GB is sufficient for many graphics workloads but limits large-scale compute tasks.

The LX ULTRA has a lower TDP at 225 W versus 700 W, a 3.1 times difference in power draw. It also has a lower suggested PSU at 550 W versus 1100 W. The H800 SXM5's power connector is 8-pin EPS, while the LX ULTRA uses a single 16-pin connector. These differences affect deployment density and cooling requirements.

Release dates differ: the H800 SXM5 was released on 2023-03-20, while the LX ULTRA is dated 2026-03-16. Both are listed as Active in production status. The H800 SXM5 has a predecessor in Server Ada and a successor in Server Blackwell, while the LX ULTRA has no predecessor or successor recorded.

The Verdict

The data points to two different products for two different roles. The NVIDIA H800 SXM5 should be selected for compute-intensive, memory-hungry, and tensor-heavy workloads. Its 80 GB HBM3 with 3.36 TB/s bandwidth, 528 tensor cores, and 59.30 TFLOPS FP32 make it the only choice between these two for large-scale neural network training or inference, scientific simulation, and any task where memory bandwidth is the limiting factor. The absence of display outputs and graphics APIs confirms its server-oriented purpose.

The Lisuan Tech LX ULTRA should be selected for graphics rendering, display output, and rasterization-heavy tasks. Its 192.0 GPixel/s pixel rate, 96 ROPs, four DisplayPort 1.4a outputs, and full DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.3 support make it the only option here for driving monitors or rendering frames. Its lower 225 W TDP and 550 W suggested PSU also make it far easier to integrate into conventional workstations.

The FP16 ratio difference matters. The H800 SXM5 achieves 237.2 TFLOPS with a 4:1 ratio, indicating tensor-optimized packed math. The LX ULTRA achieves 49.15 TFLOPS with a 2:1 ratio, a more conventional FP16 implementation. Workloads that can use the H800 SXM5's tensor cores will see outsized gains in FP16, while the LX ULTRA's FP16 is more general-purpose.

Neither device has recorded benchmark scores, so percentile rankings are identical at 50. The comparison thus rests entirely on specifications. The H800 SXM5 wins on compute throughput, memory bandwidth, memory capacity, tensor cores, and texture rate. The LX ULTRA wins on pixel rate, ROP count, display outputs, graphics API support, power draw, and physical form factor. The choice depends on whether the workload is compute-bound or graphics-bound.

The H800 SXM5's transistor count of 80,000 million on an 814 mm² die, built on 5 nm, indicates a far more complex and expensive part. The LX ULTRA's 6 nm process with unknown transistor count suggests a simpler design. The H800 SXM5 is also a server module requiring an 8-pin EPS connector and 1100 W PSU, while the LX ULTRA is a dual-slot card with a 16-pin connector and 550 W PSU.

The LX ULTRA's higher pixel rate and ROP count are the only clear performance wins it holds over the H800 SXM5. In every compute metric, the H800 SXM5 is ahead. For any user whose primary goal is floating-point throughput, memory bandwidth, or tensor math, the H800 SXM5 is the definitive choice. For any user whose primary goal is rendering frames, outputting video, or running graphics API-based applications, the LX ULTRA is the only device that can do so.

FAQ

Q: Which device has more memory bandwidth?

A: The NVIDIA H800 SXM5 has 3.36 TB/s of memory bandwidth from 80 GB of HBM3 on a 5120-bit bus. The Lisuan Tech LX ULTRA has 432.0 GB/s from 24 GB of GDDR6 on a 192-bit bus.

Q: Can the H800 SXM5 output video to a display?

A: No. The H800 SXM5 has no display outputs and no graphics API support recorded. The Lisuan Tech LX ULTRA has four DisplayPort 1.4a outputs and supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3.

Q: Which device is faster in FP32 compute?

A: The H800 SXM5 delivers 59.30 TFLOPS FP32, while the LX ULTRA delivers 24.58 TFLOPS FP32. The H800 SXM5 is approximately 2.4 times faster in FP32.

Q: Does the LX ULTRA have tensor cores?

A: The database records no tensor cores for the LX ULTRA. The H800 SXM5 has 528 tensor cores.

Q: What are the power requirements for each device?

A: The H800 SXM5 has a 700 W TDP with an 8-pin EPS connector and a suggested 1100 W PSU. The LX ULTRA has a 225 W TDP with a single 16-pin connector and a suggested 550 W PSU.

Q: Which device has a higher pixel rate?

A: The LX ULTRA has a pixel rate of 192.0 GPixel/s, while the H800 SXM5 has 42.12 GPixel/s. The LX ULTRA is approximately 4.6 times faster in pixel throughput.