AMD Instinct MI308X vs NVIDIA N1 16SM Comparison

Where Each One Wins

The recorded data separates these two accelerators into entirely different operating envelopes. The AMD Instinct MI308X is built for massive parallel throughput with 19,456 shading units, 1,216 texture mapping units, and an 8,192 bit memory bus. Its FP32 output is 81.72 TFLOPS, and its FP16 output is identical at 81.72 TFLOPS with a 1:1 ratio. The NVIDIA N1 16SM delivers 9.609 TFLOPS in both FP32 and FP16, also at a 1:1 ratio, but with only 2,048 shading units, 128 TMUs, and 24 ROPs.

The MI308X wins on raw compute density. Its texture rate is 2,553.6 GTexel/s versus 300.3 GTexel/s for the N1. That is an 8.5x advantage in texture throughput. The pixel rate tells a different story: the MI308X reports 0 MPixel/s, while the N1 reports 56.30 GPixel/s. The MI308X has no ROPs at all, meaning it cannot rasterize frames in the conventional sense. The N1 has 24 ROPs and a single HDMI output, so it can drive a display. The MI308X has no display outputs.

Memory bandwidth separates them further. The MI308X uses 192 GB of HBM3 across an 8,192 bit bus, achieving 5.32 TB/s. The N1 uses 128 GB of LPDDR5X across a 256 bit bus, achieving 273.2 GB/s. That is a 19.5x bandwidth gap. The MI308X is a memory-bandwidth monster; the N1 is a compact integrated processor with modest bandwidth.

The use case split is clear from the architecture. The MI308X targets workloads that demand enormous memory bandwidth and massive FP32/FP16 throughput, such as large-scale compute kernels. The N1 targets embedded or integrated scenarios where display output, rasterization, and lower power operation matter. The N1 has 16 ray tracing cores and 64 tensor cores, while the MI308X lists neither RT cores nor tensor cores in the database. The MI308X is not a graphics part; it is a pure compute accelerator.

Architecture Differences

The MI308X uses the Aqua Vanjaram chip built on CDNA 3.0 architecture, fabricated on a 5 nm process at TSMC. The die measures 1,017 mm² and contains 153,000 million transistors, giving a transistor density of 150.4 million per square millimeter. The N1 uses the GB20B chip built on Blackwell 2.0 architecture, also fabricated on a 5 nm process at TSMC, but the die is 382 mm² with transistor count listed as unknown. The MI308X is nearly three times the die area of the N1: 1,017 mm² versus 382 mm².

Clock behavior differs sharply. The MI308X has a base clock of 1000 MHz and a boost clock of 2100 MHz. The N1 has a base clock of 741 MHz and a boost clock of 2346 MHz. The N1 boosts higher, but the MI308X starts from a much higher base and carries far more execution units. Memory clocks also differ: the MI308X runs at 1300 MHz with 5.2 Gbps effective data rate, while the N1 runs at 1067 MHz with 8.5 Gbps effective. The N1 uses a faster per-pin data rate, but the MI308X compensates with a 32x wider bus.

The MI308X belongs to the Instinct (MIx) generation, released on 2023-12-05, with Radeon Instinct as its predecessor. The N1 belongs to the Blackwell IGP (N1x) generation, released on 2026-05-31, and has no predecessor listed. The N1 is marked as active production status; the MI308X has no production status listed. The N1 is an IGP (integrated graphics processor) with a slot width of IGP, while the MI308X is an OAM module with no power connectors. The MI308X has a suggested PSU of 1150 W and a TDP of 750 W; the N1 lists TDP as unknown and no suggested PSU.

Memory type is a fundamental split. HBM3 on the MI308X versus LPDDR5X on the N1. The MI308X has no ROPs, no pixel rate, and no display outputs, confirming it is not intended for graphics rendering. The N1 has 24 ROPs, a 56.30 GPixel/s pixel rate, and one HDMI output, confirming it can handle display tasks.

FAQ

Q: Which accelerator has higher FP32 throughput?

A: The AMD Instinct MI308X delivers 81.72 TFLOPS FP32, which is 8.5 times the NVIDIA N1 16SM's 9.609 TFLOPS FP32.

Q: Does the NVIDIA N1 16SM support display output?

A: Yes, the N1 16SM has 1x HDMI output and 24 ROPs with a pixel rate of 56.30 GPixel/s. The AMD Instinct MI308X has no display outputs and a pixel rate of 0 MPixel/s.

Q: What are the memory capacities and types?

A: The MI308X has 192 GB of HBM3 with an 8,192 bit bus and 5.32 TB/s bandwidth. The N1 16SM has 128 GB of LPDDR5X with a 256 bit bus and 273.2 GB/s bandwidth.

Q: Which chip is larger?

A: The MI308X uses the Aqua Vanjaram die at 1,017 mm² with 153,000 million transistors. The N1 16SM uses the GB20B die at 382 mm² with unknown transistor count.

Q: Do both chips use the same process node?

A: Yes, both use a 5 nm process at TSMC, but they use different architectures: CDNA 3.0 for the MI308X and Blackwell 2.0 for the N1 16SM.

Q: Does the MI308X have ray tracing cores?

A: The database lists no RT cores for the MI308X. The N1 16SM has 16 RT cores and 64 tensor cores.

Specification Differences

The two parts differ in nearly every measured field. Shading units: 19,456 versus 2,048. TMUs: 1,216 versus 128. ROPs: 0 versus 24. RT cores: none versus 16. Tensor cores: none versus 64. Pixel rate: 0 MPixel/s versus 56.30 GPixel/s. Texture rate: 2,553.6 GTexel/s versus 300.3 GTexel/s. FP32: 81.72 TFLOPS versus 9.609 TFLOPS. FP16: 81.72 TFLOPS versus 9.609 TFLOPS.

Memory size: 192 GB versus 128 GB. Memory type: HBM3 versus LPDDR5X. Bus width: 8,192 bit versus 256 bit. Bandwidth: 5.32 TB/s versus 273.2 GB/s. Memory clock: 1300 MHz at 5.2 Gbps effective versus 1067 MHz at 8.5 Gbps effective.

Base clock: 1000 MHz versus 741 MHz. Boost clock: 2100 MHz versus 2346 MHz. Die size: 1,017 mm² versus 382 mm². Transistor count: 153,000 million versus unknown. Transistor density: 150.4M per mm² versus null. TDP: 750 W versus unknown. Suggested PSU: 1150 W versus null. Power connectors: none for both. Slot width: OAM Module versus IGP. Bus interface: PCIe 5.0 x16 for both. Display outputs: none versus 1x HDMI. Release date: 2023-12-05 versus 2026-05-31. Production status: null versus active. Both list DirectX, OpenGL, and Vulkan as N/A.

The MI308X is a larger, older, higher-power compute module. The N1 is a newer, smaller, integrated part with graphics capability. Both share the same process node and bus interface, but almost nothing else.

Head-to-Head Benchmarks

The database records no head-to-head benchmark entries for this pair, and neither part has an average benchmark score or nearest rivals listed. Both sit at the 50th percentile against all GPUs. With no direct measurements, the comparison relies entirely on the specification fields.

The largest win for the MI308X is memory bandwidth. At 5.32 TB/s, it exceeds the N1's 273.2 GB/s by a factor of 19.5. That gap dominates any memory-bound workload. The FP32 gap is also decisive: 81.72 TFLOPS versus 9.609 TFLOPS, an 8.5x difference. Texture rate follows the same pattern: 2,553.6 GTexel/s versus 300.3 GTexel/s, also 8.5x.

The N1 wins in areas the MI308X does not address. The N1 has 24 ROPs and a 56.30 GPixel/s pixel rate; the MI308X has 0 MPixel/s. The N1 has 16 RT cores and 64 tensor cores; the MI308X has none listed. The N1 has a higher boost clock at 2346 MHz versus 2100 MHz. The N1 also uses a faster effective memory data rate at 8.5 Gbps versus 5.2 Gbps, though across a much narrower bus.

The MI308X carries 192 GB of memory versus 128 GB, a 64 GB capacity advantage. It also has a wider bus by 32x: 8,192 bit versus 256 bit. The die size difference is 1,017 mm² versus 382 mm², so the MI308X devotes far more silicon to compute and memory interfaces. The transistor count of 153,000 million for the MI308X is substantial, though the N1's count is unknown.

The N1's pixel rate and ROP count indicate it can perform rasterization, while the MI308X cannot. The N1's tensor cores and RT cores suggest it can handle AI inference and ray tracing workloads, which the MI308X does not expose in its specifications. The MI308X compensates with raw FP32 and FP16 throughput that is 8.5x higher, making it the stronger choice for dense compute loops that do not require graphics features.

The data implies the two parts are not direct competitors. One is a compute accelerator with no display path; the other is an integrated processor with display and graphics features. The only shared traits are the 5 nm TSMC process and the PCIe 5.0 x16 interface.

The Verdict

The AMD Instinct MI308X is the choice for workloads that need extreme memory bandwidth and high FP32/FP16 throughput. Its 5.32 TB/s bandwidth, 192 GB capacity, and 81.72 TFLOPS FP32 place it firmly in the high-performance compute category. The absence of ROPs, pixel rate, and display outputs means it is not suited for graphics rendering or display tasks. Its 750 W TDP and 1150 W suggested PSU indicate a system designed for dedicated accelerator slots, not desktop integration.

The NVIDIA N1 16SM is the choice for integrated systems that need display output, rasterization, and modest compute. Its 24 ROPs, 56.30 GPixel/s pixel rate, and 1x HDMI output make it a functional graphics solution. Its 16 RT cores and 64 tensor cores add ray tracing and AI acceleration capabilities that the MI308X does not list. The 128 GB LPDDR5X memory is ample for integrated use, though the 273.2 GB/s bandwidth is far below the MI308X.

The release dates reinforce the generational split. The MI308X launched on 2023-12-05; the N1 is dated 2026-05-31. The N1 is newer, smaller at 382 mm², and uses a higher boost clock at 2346 MHz. The MI308X is larger at 1,017 mm², older, and uses a lower boost clock at 2100 MHz.

No benchmark scores exist for either part, so the verdict rests on specification analysis. The MI308X dominates in compute throughput and memory bandwidth by wide margins. The N1 dominates in graphics features and display capability. Buyers with compute-heavy, memory-hungry workloads should select the MI308X. Buyers needing an integrated part with display output and graphics acceleration should select the N1 16SM. The data does not support a single winner; it supports two different tools for two different jobs.