AMD Instinct MI300 vs NVIDIA N1 20SM Comparison

The Verdict

The recorded data presents two fundamentally different accelerators that share only a 128 GB memory capacity and a PCIe 5.0 x16 interface. The AMD Instinct MI300 is a dedicated compute accelerator built on the CDNA 3.0 architecture with the Aqua Vanjaram chip, while the NVIDIA N1 20SM is an integrated graphics processor (IGP) based on the Blackwell 2.0 architecture with the GB20B chip. The MI300 carries a 600 W TDP and requires 2x 8-pin power connectors plus a 1000 W suggested PSU, whereas the N1 20SM has no power connectors and an unknown TDP, indicating it draws power through its socket.

Benchmark results are sparse in the database: both parts show zero recorded benchmarks, an average benchmark score of 0, and a percentile rank of 50 against all GPUs. Neither has any nearest rivals listed, and the head-to-head benchmark array is empty. Consequently, the verdict must rest entirely on architectural specifications and physical characteristics rather than measured performance.

The MI300 targets compute-heavy workloads. Its 14080 shading units, 880 texture mapping units, and 47.87 TFLOPS FP32 throughput place it in a different performance class than the N1 20SM. The N1 20SM, with 2560 shading units, 160 TMUs, and 24 ROPs, delivers 12.01 TFLOPS FP32. The MI300 also offers 8192-bit memory bus width with 5.32 TB/s bandwidth, compared to the N1 20SM's 256-bit bus and 273.2 GB/s bandwidth. For raw compute throughput and memory bandwidth, the MI300 is the clear choice.

The N1 20SM, however, includes features the MI300 lacks entirely. It has 20 ray tracing cores and 80 tensor cores, both absent from the MI300's specification sheet. It also provides a display output (1x HDMI) and a pixel rate of 56.30 GPixel/s, while the MI300 has zero pixel rate and no display outputs. The MI300 is a compute-only device with no graphics output capability. Users requiring any form of visual output or ray tracing support must choose the N1 20SM.

Where Each One Wins

The AMD Instinct MI300 wins decisively in computational throughput. Its FP32 figure of 47.87 TFLOPS is roughly four times the N1 20SM's 12.01 TFLOPS. Texture rate favors the MI300 at 1,496.0 GTexel/s versus 375.4 GTexel/s. The MI300's 153,000 million transistors on a 1017 mm² die dwarf the N1 20SM's 382 mm² die, though the N1 20SM's transistor count is listed as unknown. The MI300 also boosts to 1700 MHz versus 2346 MHz for the N1 20SM, but the MI300's massive compute unit count more than compensates for its lower clock.

Memory bandwidth is another dominant win for the MI300. Its HBM3 memory at 5.32 TB/s exceeds the N1 20SM's LPDDR5X at 273.2 GB/s by a factor of roughly 19. Both have 128 GB capacity, but the MI300's 8192-bit bus versus 256-bit bus explains the bandwidth gap. The MI300's memory clock is listed as 1300 MHz with 5.2 Gbps effective, while the N1 20SM runs at 1067 MHz with 8.5 Gbps effective.

The NVIDIA N1 20SM wins in features that the MI300 simply does not offer. It has ray tracing cores (20), tensor cores (80), a pixel rate of 56.30 GPixel/s, and a display output. The MI300 lists zero ROPs, zero pixel rate, and no display outputs. The N1 20SM also has a smaller die (382 mm² vs 1017 mm²), which suggests lower manufacturing cost per unit, though pricing data is not available in the database.

Clock speeds favor the N1 20SM in boost (2346 MHz vs 1700 MHz) and base (741 MHz vs 1000 MHz for the MI300). However, the MI300's base clock is higher, meaning it sustains more performance at idle or low load. The N1 20SM also has a higher memory effective speed (8.5 Gbps vs 5.2 Gbps), but the MI300's much wider bus negates this advantage.

Architecture Differences

The MI300 uses the CDNA 3.0 architecture, a compute-optimized design from AMD. It is manufactured on a 5 nm TSMC process with 153,000 million transistors on a 1017 mm² die, yielding a transistor density of 150.4M per mm². The chip is named Aqua Vanjaram. The MI300 has 14080 shading units, 880 TMUs, and zero ROPs. It uses HBM3 memory with 128 GB capacity on an 8192-bit bus. Its APIs are all listed as N/A, indicating no graphics API support. The device measures 267 mm in length and 111 mm in height.

The N1 20SM uses the Blackwell 2.0 architecture, an integrated GPU design from NVIDIA. It is also on a 5 nm TSMC process but with an unknown transistor count on a 382 mm² die. The chip is named GB20B. The N1 20SM has 2560 shading units, 160 TMUs, and 24 ROPs. It includes 20 ray tracing cores and 80 tensor cores. Memory is LPDDR5X with 128 GB capacity on a 256-bit bus. The N1 20SM has one HDMI output. Its production status is listed as Active, while the MI300's production status is null.

Power delivery differs substantially. The MI300 draws up to 600 W TDP with 2x 8-pin power connectors and a suggested 1000 W PSU. The N1 20SM has an unknown TDP, no power connectors, and no suggested PSU, consistent with an integrated processor that draws power from the motherboard. The MI300 is a dual-slot or larger card (dimensions confirm a physical card), while the N1 20SM is classified as IGP with no dimensions listed.

The release dates differ by more than three years. The MI300 launched on 2023-01-03, while the N1 20SM is dated 2026-05-31. The MI300's predecessor is listed as Radeon Instinct, with no successor. The N1 20SM has no predecessor or successor listed. The MI300 belongs to the Instinct (MIx) generation, while the N1 20SM belongs to the Blackwell IGP (N1x) generation.

FAQ

Q: Which accelerator has more raw compute power?

A: The AMD Instinct MI300 delivers 47.87 TFLOPS FP32 and 47.87 TFLOPS FP16 (1:1), while the NVIDIA N1 20SM provides 12.01 TFLOPS FP32 and 12.01 TFLOPS FP16 (1:1). The MI300 quadruples the FP32 throughput.

Q: Can either device output video to a display?

A: Only the NVIDIA N1 20SM has a display output: 1x HDMI. The AMD Instinct MI300 lists no display outputs and has a pixel rate of 0 MPixel/s, making it unsuitable for graphics presentation.

Q: How do their memory systems compare?

A: Both have 128 GB capacity. The MI300 uses HBM3 with an 8192-bit bus and 5.32 TB/s bandwidth. The N1 20SM uses LPDDR5X with a 256-bit bus and 273.2 GB/s bandwidth. The MI300's bandwidth is about 19 times higher.

Q: Does the NVIDIA N1 20SM support ray tracing?

A: Yes, it includes 20 ray tracing cores. The AMD Instinct MI300 lists no ray tracing cores, consistent with its compute-only CDNA 3.0 architecture.

Q: What are the power requirements for each?

A: The MI300 has a 600 W TDP, uses 2x 8-pin power connectors, and suggests a 1000 W PSU. The N1 20SM has an unknown TDP and no power connectors, functioning as an integrated processor.

Q: Which has tensor cores for AI workloads?

A: The NVIDIA N1 20SM has 80 tensor cores. The AMD Instinct MI300 does not list tensor cores in its specifications, though its FP16 throughput matches its FP32 throughput at a 1:1 ratio.

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark results between these two parts. The winsA and winsB fields are both 0, and the headToHeadBenchmarks array is empty. Without measured performance data, the comparison must rely on the specification sheet differences that are recorded.

The largest specification gap appears in memory bandwidth. The MI300's 5.32 TB/s from HBM3 on an 8192-bit bus compares to the N1 20SM's 273.2 GB/s from LPDDR5X on a 256-bit bus. This 19-fold difference in bandwidth will dominate any memory-bound workload, from large language model inference to scientific simulation data movement. The MI300's memory runs at 1300 MHz with 5.2 Gbps effective, while the N1 20SM runs at 1067 MHz with 8.5 Gbps effective, but the bus width difference renders the clock comparison moot.

Raw shader throughput shows a similar disparity. The MI300's 14080 shading units at up to 1700 MHz produce 47.87 TFLOPS FP32. The N1 20SM's 2560 shading units at up to 2346 MHz produce 12.01 TFLOPS. The MI300 has 5.5 times the shading units, and while the N1 20SM clocks 646 MHz higher in boost, it cannot close the throughput gap. Texture rate follows the same pattern: 1,496.0 GTexel/s versus 375.4 GTexel/s, a 4-fold advantage for the MI300.

The N1 20SM counters with features the MI300 lacks. Its 24 ROPs enable a 56.30 GPixel/s pixel rate, while the MI300 has zero ROPs and zero pixel rate. The 20 ray tracing cores and 80 tensor cores give the N1 20SM capabilities in graphics and AI acceleration that the MI300 cannot match on paper. The MI300's CDNA 3.0 architecture omits these units entirely, focusing exclusively on compute throughput.

Clock behavior also differs. The MI300 has a higher base clock (1000 MHz) than the N1 20SM (741 MHz), suggesting better sustained performance at lower utilization. The N1 20SM's boost clock of 2346 MHz exceeds the MI300's 1700 MHz, but this advantage applies only to the smaller shader array.

Transistor density favors the MI300 at 150.4M per mm², though the N1 20SM's transistor count is unknown, preventing a direct density comparison. The MI300's 1017 mm² die is nearly three times the N1 20SM's 382 mm², reflecting its larger compute array and wider memory interface.

Power consumption data confirms the MI300 as a high-power dedicated accelerator. Its 600 W TDP with 2x 8-pin connectors and 1000 W suggested PSU indicates a system-level investment. The N1 20SM, with no power connectors and an unknown TDP, integrates into a host processor package, trading performance for simplicity.

The release timeline shows the MI300 arriving in early 2023, while the N1 20SM is dated to mid-2026. This three-year gap means the MI300 represents an earlier generation of AMD's Instinct line, while the N1 20SM is a newer NVIDIA Blackwell IGP design. The N1 20SM's Active production status contrasts with the MI300's null status, which may indicate the MI300 is no longer in active production, though the database does not explicitly confirm this.

In the absence of benchmark scores, the specification data provides the only basis for comparison. The MI300 dominates in compute throughput, memory bandwidth, and texture rate. The N1 20SM offers graphics output, ray tracing, tensor cores, and a higher boost clock. Each part serves a distinct purpose: the MI300 for datacenter compute, the N1 20SM for integrated graphics within a host system. Neither part shows recorded wins in the database, so the head-to-head comparison remains architectural rather than empirical.