AMD Instinct MI300 vs NVIDIA N1X 40SM Comparison

The Verdict

The AMD Instinct MI300 and NVIDIA N1X 40SM serve entirely different purposes, despite sharing identical 128 GB memory capacities. The data shows the MI300 is a compute-oriented accelerator built around the CDNA 3.0 architecture, while the N1X 40SM is an integrated graphics processor (IGP) on the Blackwell 2.0 architecture. The MI300 holds decisive advantages in raw compute throughput, memory bandwidth, and texture processing. The N1X 40SM counters with significantly higher boost clocks, pixel fill rate, and includes features the MI300 lacks entirely, such as ray tracing cores and a display output.

For workloads centered on massive parallel computation, large data sets, or high-bandwidth memory access, the MI300 is the clear choice. Its 5.32 TB/s memory bandwidth and 47.87 TFLOPS FP32 performance dwarf the N1X 40SM's 273.2 GB/s and 24.02 TFLOPS. For systems requiring graphics output, ray tracing capability, or operation within an integrated power envelope, the N1X 40SM is the only viable option between the two, as the MI300 has no display outputs and no ray tracing hardware. The N1X 40SM also benefits from a newer release date and active production status, while the MI300's production status is not recorded.

FAQ

Q: Which processor has higher FP32 compute performance?

A: The AMD Instinct MI300 delivers 47.87 TFLOPS FP32, which is roughly double the NVIDIA N1X 40SM's 24.02 TFLOPS. The MI300 achieves this with 14,080 shading units compared to the N1X 40SM's 5,120.

Q: Do both processors support PCIe 5.0?

A: Yes, both the AMD Instinct MI300 and the NVIDIA N1X 40SM use a PCIe 5.0 x16 bus interface.

Q: Can either processor output video to a display?

A: Only the NVIDIA N1X 40SM has a display output, providing 1x HDMI. The AMD Instinct MI300 has no display outputs.

Q: What is the difference in memory technology?

A: The MI300 uses 128 GB of HBM3 on an 8192-bit bus, achieving 5.32 TB/s bandwidth. The N1X 40SM uses 128 GB of LPDDR5X on a 256-bit bus, achieving 273.2 GB/s bandwidth.

Q: Which processor includes ray tracing cores?

A: The NVIDIA N1X 40SM includes 40 ray tracing cores. The AMD Instinct MI300 has no ray tracing cores recorded in the database.

Q: What are the boost clock speeds?

A: The NVIDIA N1X 40SM boosts to 2346 MHz, substantially higher than the AMD Instinct MI300's 1700 MHz boost clock.

Architecture Differences

The AMD Instinct MI300 uses the CDNA 3.0 architecture, built on the Aqua Vanjaram chip. This architecture is optimized for compute-intensive workloads, as evidenced by the absence of ray tracing cores and display outputs. The MI300's design prioritizes memory bandwidth and shading unit count. It integrates 153,000 million transistors on a 1017 mm² die, produced by TSMC on a 5 nm process. The transistor density measures 150.4 million transistors per square millimeter.

The NVIDIA N1X 40SM uses the Blackwell 2.0 architecture, built on the GB20B chip. This architecture includes 40 ray tracing cores and 160 tensor cores, features entirely absent from the MI300's specification sheet. The N1X 40SM is classified as an IGP (integrated graphics processor), indicating it is designed for integration into a system rather than as a discrete add-in card. Its die size is 382 mm², also on TSMC's 5 nm process, though its transistor count is listed as unknown in the database.

The MI300 belongs to the Instinct (MIx) generation, with its predecessor listed as Radeon Instinct. The N1X 40SM belongs to the Blackwell IGP (N1x) generation, with no predecessor recorded. The MI300's release date is recorded as 2023-01-03, while the N1X 40SM's release date is recorded as 2026-05-31, indicating a significant generational gap between the two products.

Specification Differences

The AMD Instinct MI300 and NVIDIA N1X 40SM differ across nearly every recorded specification. The MI300 has a base clock of 1000 MHz and a boost clock of 1700 MHz, while the N1X 40SM has a lower base clock of 741 MHz but a much higher boost clock of 2346 MHz. Memory clocks also differ: the MI300 runs at 1300 MHz with 5.2 Gbps effective, while the N1X 40SM runs at 1067 MHz with 8.5 Gbps effective.

The MI300's memory subsystem is vastly larger: 128 GB of HBM3 on an 8192-bit bus delivering 5.32 TB/s, versus 128 GB of LPDDR5X on a 256-bit bus delivering 273.2 GB/s. The MI300 has 14,080 shading units, 880 texture mapping units, and 0 ROPs. The N1X 40SM has 5,120 shading units, 320 texture mapping units, and 40 ROPs. The N1X 40SM also includes 40 ray tracing cores and 160 tensor cores, neither of which are present in the MI300's data.

Pixel and texture rates diverge sharply. The MI300 records a pixel rate of 0 MPixel/s due to the absence of ROPs, while the N1X 40SM achieves 93.84 GPixel/s. Texture rate favors the MI300 at 1,496.0 GTexel/s versus the N1X 40SM's 750.7 GTexel/s. Power requirements differ: the MI300 has a TDP of 600 W with 2x 8-pin power connectors and a suggested PSU of 1000 W, while the N1X 40SM has unknown TDP, no power connectors, and no suggested PSU, consistent with its IGP classification.

Physical specifications also differ. The MI300 measures 267 mm in length and 111 mm in height. The N1X 40SM has no recorded dimensions and is classified as an IGP slot width. Display outputs favor the N1X 40SM with 1x HDMI, while the MI300 has none. Both processors list DirectX, OpenGL, and Vulkan APIs as N/A.

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark scores for these two processors. Both have an average benchmark score of 0 and a percentile rank of 50 out of all GPUs. However, the recorded specifications provide clear performance indicators that allow for direct comparison.

The MI300's FP32 throughput of 47.87 TFLOPS is exactly double the N1X 40SM's 24.02 TFLOPS. This indicates the MI300 can process twice as many floating-point operations per second, a critical advantage for scientific computing, AI training, and simulation workloads. The FP16 performance mirrors FP32 exactly at 47.87 TFLOPS for the MI300 and 24.02 TFLOPS for the N1X 40SM, both at a 1:1 ratio.

Memory bandwidth presents the largest relative gap. The MI300's 5.32 TB/s is approximately 19.5 times greater than the N1X 40SM's 273.2 GB/s. This translates to dramatically faster data movement for large models or data sets that exceed the capacity of smaller memory subsystems. The MI300's 8192-bit bus versus the N1X 40SM's 256-bit bus underpins this advantage.

Texture processing also favors the MI300. Its 1,496.0 GTexel/s is roughly double the N1X 40SM's 750.7 GTexel/s. The MI300's 880 TMUs versus the N1X 40SM's 320 TMUs drive this difference, though the N1X 40SM's higher boost clock partially compensates.

The N1X 40SM wins decisively in pixel fill rate. Its 93.84 GPixel/s contrasts with the MI300's 0 MPixel/s, a direct consequence of the MI300 having no ROPs. For any workload that involves rasterization to a framebuffer, the N1X 40SM is the only functional option between the two.

Clock speed comparisons show the N1X 40SM's boost clock of 2346 MHz is 38% higher than the MI300's 1700 MHz. This higher clock helps the N1X 40SM compensate for its lower core count in some workloads, though it cannot overcome the MI300's massive core and bandwidth advantages in compute-heavy tasks.

Where Each One Wins

The AMD Instinct MI300 wins in scenarios demanding raw compute throughput and memory bandwidth. Its 47.87 TFLOPS FP32 and FP16 performance, combined with 5.32 TB/s memory bandwidth, make it suitable for large-scale parallel computation. The 128 GB HBM3 memory capacity with an 8192-bit bus allows handling very large data sets that would overwhelm narrower memory interfaces. The 1,496.0 GTexel/s texture rate also gives it an edge in texture-heavy compute workloads. The MI300's 600 W TDP and 2x 8-pin power connectors indicate it is designed for dedicated compute nodes with substantial power delivery, and its 267 mm length fits standard server chassis layouts.

The NVIDIA N1X 40SM wins in scenarios requiring graphics output, ray tracing, or rasterization. Its 1x HDMI output makes it the only one of the two that can drive a display. The 40 ray tracing cores enable hardware-accelerated ray tracing, a feature entirely absent from the MI300. The 93.84 GPixel/s pixel rate confirms its capability in framebuffer operations. The 160 tensor cores provide dedicated hardware for AI inference workloads, another feature the MI300 lacks. As an IGP with no power connectors, it operates within an integrated power envelope, making it suitable for systems where discrete graphics power delivery is unavailable or undesirable.

The N1X 40SM's higher boost clock of 2346 MHz and newer release date of 2026-05-31 also position it as a more modern design, though its 382 mm² die size is less than half the MI300's 1017 mm². The MI300's 153,000 million transistors versus the N1X 40SM's unknown count reflects the former's larger compute investment, while the latter's active production status indicates ongoing availability. For builders selecting between these two, the decision hinges on whether the workload demands the MI300's massive compute and bandwidth resources or the N1X 40SM's integrated graphics, ray tracing, and display capabilities.