AMD Radeon Instinct MI300 vs Lisuan Tech LX ULTRA Comparison

FAQ

Q: What are the core architectural differences between the AMD Radeon Instinct MI300 and the Lisuan Tech LX ULTRA?

A: The MI300 uses a 5 nm process with the CDNA 3.0 architecture on the Aqua Vanjaram chip, while the LX ULTRA uses a 6 nm process with the TrueGPU architecture on the 7G105 chip. Both are manufactured by TSMC, but the MI300 has 153,000 million transistors on a 1017 mm² die, whereas the LX ULTRA's transistor count and die size are unknown.

Q: How do the memory subsystems compare?

A: The MI300 offers 128 GB of HBM3 memory with an 8192-bit bus and 6.55 TB/s bandwidth. The LX ULTRA provides 24 GB of GDDR6 memory with a 192-bit bus and 432.0 GB/s bandwidth. The MI300's memory bandwidth is more than 15 times higher.

Q: Which card has higher compute throughput for FP32 operations?

A: The MI300 delivers 47.87 TFLOPS of FP32 compute, while the LX ULTRA delivers 24.58 TFLOPS. The MI300 is approximately 95% ahead in raw FP32 throughput.

Q: What are the power requirements for each card?

A: The MI300 has a TDP of 600 W and requires a 1000 W suggested PSU with 2x 8-pin power connectors. The LX ULTRA has a TDP of 225 W, a suggested PSU of 550 W, and uses a single 16-pin power connector.

Q: What display outputs do these cards support?

A: The MI300 has no display outputs, making it a compute-only accelerator. The LX ULTRA includes 4x DisplayPort 1.4a outputs and supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3.

Q: How do the physical dimensions compare?

A: The MI300 measures 267 mm in length and 111 mm in height. The LX ULTRA is 268 mm long, 112 mm high, and 40 mm wide, with a dual-slot design. The two cards are nearly identical in length and height.

Where Each One Wins

The AMD Radeon Instinct MI300 dominates in memory capacity and bandwidth. Its 128 GB HBM3 pool with 6.55 TB/s bandwidth is a decisive advantage for workloads that load massive datasets into GPU memory. The 8192-bit bus width provides extremely high throughput for data movement, and the 6.4 Gbps effective memory clock supports sustained access patterns. For large-scale inference, training, or scientific computing with huge working sets, the MI300's memory subsystem is the clear leader.

The MI300 also wins in compute density. Its 47.87 TFLOPS FP32 rate is roughly double the LX ULTRA's 24.58 TFLOPS. The FP16 comparison is even starker: the MI300 reaches 383.0 TFLOPS (8:1 ratio) versus 49.15 TFLOPS (2:1 ratio) for the LX ULTRA, a margin of nearly 8 times. Texture throughput is also much higher on the MI300 at 1,496.0 GTexel/s versus 384.0 GTexel/s. The MI300 has more shading units (14,080 vs 6,144) and more TMUs (880 vs 192).

The Lisuan Tech LX ULTRA wins in areas related to general-purpose graphics and practical deployment. It has 96 ROPs and a 192.0 GPixel/s pixel rate, while the MI300 has 0 ROPs and a 0 MPixel/s pixel rate. The LX ULTRA includes 4x DisplayPort 1.4a outputs, meaning it can drive displays directly, while the MI300 has no outputs at all. The LX ULTRA also supports a full modern API stack including DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3; the MI300 lists none of these APIs in the database.

The LX ULTRA wins on power efficiency and system integration. Its 225 W TDP is less than half the MI300's 600 W, and its suggested PSU is 550 W versus 1000 W. The LX ULTRA uses PCIe 4.0 x16, while the MI300 uses PCIe 5.0 x16; the newer interface is a capability advantage for the MI300, but the LX ULTRA's compatibility with existing platforms is broader. The LX ULTRA is also listed as Active in production status, while the MI300's production status is not recorded.

Architecture Differences

The MI300 is built on CDNA 3.0, an architecture designed for data center compute acceleration. It uses the Aqua Vanjaram chip on a 5 nm TSMC process with 153,000 million transistors packed into a 1017 mm² die, yielding a transistor density of 150.4M per mm². The architecture allocates resources heavily toward shading units (14,080), TMUs (880), and memory controllers for its 8192-bit HBM3 interface. It has no ROPs, no display outputs, and no recorded API support, indicating a pure accelerator design. The power delivery uses 2x 8-pin connectors and a 1000 W suggested PSU, consistent with a 600 W TDP class part.

The LX ULTRA is built on the TrueGPU architecture with the 7G105 chip on a 6 nm TSMC process. The transistor count and die size are unknown in the database. The architecture includes 6,144 shading units, 192 TMUs, and 96 ROPs, making it a more complete graphics pipeline. It has a dual-slot cooler, a 16-pin power connector, and a 225 W TDP. The memory interface is 192-bit GDDR6 with 18 Gbps effective speed. The LX ULTRA supports DisplayPort 1.4a outputs and a full API stack, so the architecture is oriented toward both rendering and compute tasks.

The generations differ significantly. The MI300 belongs to the Radeon Instinct (MIx) generation, with the predecessor listed as FirePro Data Center. The LX ULTRA belongs to the 7G100 generation with no predecessor recorded. The MI300 was released on 2023-01-03, while the LX ULTRA is dated 2026-03-16, making the LX ULTRA a later release in the database.

Specification Differences

The cards differ across nearly every recorded specification. The MI300 uses a 5 nm process; the LX ULTRA uses 6 nm. Transistor count is 153,000 million for the MI300, unknown for the LX ULTRA. Die size is 1017 mm² for the MI300, unknown for the LX ULTRA. Transistor density is 150.4M per mm² for the MI300, not recorded for the LX ULTRA.

Clock speeds: the MI300 has a base clock of 1000 MHz and boost clock of 1700 MHz, with memory at 1600 MHz or 6.4 Gbps effective. The LX ULTRA has no base or boost clock recorded, but its memory runs at 2250 MHz or 18 Gbps effective.

Memory: 128 GB HBM3 with 8192-bit bus and 6.55 TB/s bandwidth for the MI300; 24 GB GDDR6 with 192-bit bus and 432.0 GB/s bandwidth for the LX ULTRA.

Compute units: 14,080 shading units, 880 TMUs, 0 ROPs for the MI300; 6,144 shading units, 192 TMUs, 96 ROPs for the LX ULTRA. Pixel rate is 0 MPixel/s for the MI300 and 192.0 GPixel/s for the LX ULTRA. Texture rate is 1,496.0 GTexel/s versus 384.0 GTexel/s. FP32 is 47.87 TFLOPS versus 24.58 TFLOPS. FP16 is 383.0 TFLOPS (8:1) versus 49.15 TFLOPS (2:1).

Power and cooling: TDP is 600 W versus 225 W. Power connectors are 2x 8-pin versus 1x 16-pin. Suggested PSU is 1000 W versus 550 W. The LX ULTRA is dual-slot; the MI300's slot width is not recorded.

Interfaces and outputs: the MI300 uses PCIe 5.0 x16 with no display outputs; the LX ULTRA uses PCIe 4.0 x16 with 4x DisplayPort 1.4a. The MI300 has no API support recorded; the LX ULTRA supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.3.

Dimensions: the MI300 is 267 mm long and 111 mm tall; the LX ULTRA is 268 mm long, 112 mm tall, and 40 mm wide.

Head-to-Head Benchmarks

No direct benchmark results are recorded in the database for either card, and the nearest rivals list is empty. The comparison must therefore rely on the recorded theoretical specifications. The database shows both cards at the 50th percentile versus all GPUs, with an average benchmark score of 0 for each, indicating no measured performance data is available. The wins analysis is based on the specification deltas.

The largest single-specification win for the MI300 is memory bandwidth: 6.55 TB/s versus 432.0 GB/s, a factor of roughly 15.2. Memory capacity is also a massive gap: 128 GB versus 24 GB. FP16 throughput shows the MI300 at 383.0 TFLOPS versus 49.15 TFLOPS, a factor of about 7.8. Texture rate is 1,496.0 GTexel/s versus 384.0 GTexel/s, a factor of 3.9. FP32 is 47.87 TFLOPS versus 24.58 TFLOPS, a factor of 1.95. Shading units are 14,080 versus 6,144, a factor of 2.3. TMUs are 880 versus 192, a factor of 4.6.

The LX ULTRA wins decisively in pixel throughput: 192.0 GPixel/s versus 0 MPixel/s. It also wins in memory clock speed at 18 Gbps effective versus 6.4 Gbps effective, though this is offset by the much narrower 192-bit bus. The LX ULTRA has a lower TDP by 375 W, a lower suggested PSU by 450 W, and uses one power connector instead of two. The LX ULTRA has display outputs while the MI300 has none, and it lists API support while the MI300 lists none.

The bus interface difference favors the MI300 on paper: PCIe 5.0 x16 versus PCIe 4.0 x16. However, the practical impact depends on workload and platform support, which is not quantified in the database. The MI300's release date is earlier (2023-01-03) than the LX ULTRA (2026-03-16), but both cards have no recorded benchmark scores, so temporal performance comparisons cannot be drawn.

The Verdict

The AMD Radeon Instinct MI300 is the compute-focused accelerator. The data shows it with 128 GB HBM3, 6.55 TB/s bandwidth, 47.87 TFLOPS FP32, 383.0 TFLOPS FP16, and a 600 W TDP. This card is built for memory-heavy, throughput-intensive data center workloads where the 8192-bit bus and massive on-board memory are the decisive factors. The absence of display outputs and API support confirms its role as a headless compute device.

The Lisuan Tech LX ULTRA is the graphics-capable card. It has 96 ROPs, 192.0 GPixel/s pixel rate, 4x DisplayPort 1.4a, and support for DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.3. Its 24 GB GDDR6 memory and 432.0 GB/s bandwidth are far smaller than the MI300, but its 225 W TDP and 550 W suggested PSU make it a more accessible installation. The dual-slot design and single 16-pin connector simplify power delivery.

The FP16 ratio difference is significant. The MI300's 8:1 ratio to reach 383.0 TFLOPS is typical of data center accelerators prioritizing AI and machine learning throughput. The LX ULTRA's 2:1 ratio to reach 49.15 TFLOPS reflects a more balanced compute design that also handles graphics. The MI300's FP16 advantage is nearly 8 times, which matters for workloads that can use reduced precision.

The MI300's transistor count of 153,000 million on a 1017 mm² die at 5 nm gives it a density of 150.4M per mm², a very high figure. The LX ULTRA's transistor count and die size are unknown, so density cannot be compared. The MI300's 880 TMUs deliver 1,496.0 GTexel/s texture throughput, while the LX ULTRA's 192 TMUs deliver 384.0 GTexel/s.

The choice depends on workload profile. For data center compute with large memory footprints and maximum FP32 or FP16 throughput, the MI300 is the clear selection based on the recorded specifications. For systems requiring display output, API compatibility, lower power draw, and a smaller PSU requirement, the LX ULTRA is the appropriate option. The LX ULTRA is the only one of the two with a production status of Active, while the MI300's status is not recorded.

Both cards sit at the 50th percentile versus all GPUs with no benchmark scores, so the recorded data does not establish real-world performance rankings. The specification deltas, however, are unambiguous: the MI300 wins in memory capacity, memory bandwidth, compute throughput, texture rate, and shading resources; the LX ULTRA wins in pixel rate, display outputs, API support, power efficiency, and physical integration.