NVIDIA GeForce RTX 4090 Max-Q vs NVIDIA N1 20SM Comparison

The Verdict

The data shows two fundamentally different NVIDIA designs aimed at separate tasks. The GeForce RTX 4090 Max-Q is a high-performance mobile graphics solution for gaming and creative workloads, built on the Ada Lovelace architecture with a 5 nm TSMC process. The N1 20SM is a Blackwell 2.0 IGP (integrated graphics processor) with a unified memory pool and a much higher boost clock. Based strictly on the recorded measurements, the RTX 4090 Max-Q delivers substantially higher raw compute throughput in both FP32 and FP16 at 28.31 TFLOPS versus 12.01 TFLOPS for the N1 20SM. It also has more shading units (9728 vs 2560), more texture mapping units (304 vs 160), more render output units (112 vs 24), more ray tracing cores (76 vs 20), and more tensor cores (304 vs 80). The RTX 4090 Max-Q wins on pixel rate (163.0 GPixel/s vs 56.30 GPixel/s) and texture rate (442.3 GTexel/s vs 375.4 GTexel/s), and it has a wider memory bandwidth at 576.0 GB/s versus 273.2 GB/s.

However, the N1 20SM has advantages that matter for specific workloads. It features a much larger memory capacity of 128 GB compared to 16 GB, uses faster LPDDR5X memory, operates on a PCIe 5.0 x16 interface versus PCIe 4.0 x16, and has a significantly higher boost clock of 2346 MHz versus 1455 MHz. The N1 20SM also has a newer release date (2026) compared to the RTX 4090 Max-Q (2023). For users who need massive memory capacity for large datasets or AI model weights that exceed 16 GB, the N1 20SM is the clear choice. For users who need maximum graphics performance, ray tracing capability, and established API support, the RTX 4090 Max-Q is the stronger option.

FAQ

Q: Which GPU has higher raw compute performance?

A: The RTX 4090 Max-Q delivers 28.31 TFLOPS in both FP32 and FP16, which is more than double the N1 20SM's 12.01 TFLOPS in the same precisions. This indicates a substantial advantage in shader-heavy workloads.

Q: How do the memory configurations compare?

A: The RTX 4090 Max-Q uses 16 GB of GDDR6 memory on a 256-bit bus with 576.0 GB/s bandwidth. The N1 20SM uses 128 GB of LPDDR5X memory on a 256-bit bus with 273.2 GB/s bandwidth. The N1 20SM has 8 times the capacity but less than half the bandwidth.

Q: What are the clock speed differences?

A: The RTX 4090 Max-Q has a base clock of 930 MHz and a boost clock of 1455 MHz. The N1 20SM has a base clock of 741 MHz and a boost clock of 2346 MHz. The N1 20SM's boost clock is 891 MHz higher.

Q: Which GPU supports newer PCIe technology?

A: The N1 20SM uses a PCIe 5.0 x16 bus interface, while the RTX 4090 Max-Q uses PCIe 4.0 x16. This means the N1 20SM can take advantage of newer platform connectivity standards.

Q: What are the API support differences?

A: The RTX 4090 Max-Q supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The N1 20SM has no recorded API support (DirectX N/A, OpenGL N/A, Vulkan N/A), which suggests it is not designed for traditional graphics APIs.

Q: Which GPU has more render output units?

A: The RTX 4090 Max-Q has 112 ROPs compared to the N1 20SM's 24 ROPs. This contributes to the RTX 4090 Max-Q's much higher pixel rate of 163.0 GPixel/s versus 56.30 GPixel/s.

Architecture Differences

The RTX 4090 Max-Q is built on the Ada Lovelace architecture using the AD103 chip, fabricated on a 5 nm process at TSMC with 45,900 million transistors on a 379 mm² die. The transistor density is 121.1M per mm². This architecture is designed for high-performance mobile graphics, with 9728 shading units, 304 TMUs, 112 ROPs, 76 ray tracing cores, and 304 tensor cores. It is part of the GeForce 40 Mobile generation and succeeds the GeForce 30 Mobile series.

The N1 20SM uses the Blackwell 2.0 architecture with the GB20B chip, also fabricated on a 5 nm process at TSMC, with a die size of 382 mm². The transistor count is listed as unknown. It belongs to the Blackwell IGP (N1x) generation and features 2560 shading units, 160 TMUs, 24 ROPs, 20 ray tracing cores, and 80 tensor cores. The smaller shader count and ROP count indicate a design focused on different priorities, likely integrated processing with unified memory rather than dedicated graphics rendering.

A key architectural difference is memory configuration. The RTX 4090 Max-Q uses dedicated GDDR6 memory with a 256-bit bus, while the N1 20SM uses LPDDR5X memory with the same 256-bit bus width but a unified memory architecture. The N1 20SM's 128 GB capacity suggests it is designed to share memory with a host processor, which is typical for IGP solutions. The boost clock difference is also notable: the N1 20SM boosts to 2346 MHz, which is 891 MHz higher than the RTX 4090 Max-Q's 1455 MHz boost, indicating a different power and thermal envelope.

Specification Differences

The two GPUs differ across nearly every recorded specification. The RTX 4090 Max-Q has a base clock of 930 MHz and a boost clock of 1455 MHz, while the N1 20SM has a base clock of 741 MHz and a boost clock of 2346 MHz. Memory speed differs as well: the RTX 4090 Max-Q operates at 2250 MHz with 18 Gbps effective, while the N1 20SM operates at 1067 MHz with 8.5 Gbps effective. Memory type is GDDR6 for the RTX 4090 Max-Q and LPDDR5X for the N1 20SM. Memory size is 16 GB versus 128 GB. Bus width is identical at 256 bit for both, but bandwidth differs at 576.0 GB/s versus 273.2 GB/s.

Compute resources differ substantially: shading units are 9728 versus 2560, TMUs are 304 versus 160, ROPs are 112 versus 24, ray tracing cores are 76 versus 20, and tensor cores are 304 versus 80. Pixel rate is 163.0 GPixel/s versus 56.30 GPixel/s, and texture rate is 442.3 GTexel/s versus 375.4 GTexel/s. FP32 and FP16 are both 28.31 TFLOPS for the RTX 4090 Max-Q and 12.01 TFLOPS for the N1 20SM.

The RTX 4090 Max-Q has a TDP of 80 W, while the N1 20SM's TDP is unknown. Both are IGP slot width with no power connectors. The bus interface is PCIe 4.0 x16 for the RTX 4090 Max-Q and PCIe 5.0 x16 for the N1 20SM. Display outputs are portable device dependent for the RTX 4090 Max-Q and 1x HDMI for the N1 20SM. API support: the RTX 4090 Max-Q supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4, while the N1 20SM has no recorded API support. Release dates are 2023 for the RTX 4090 Max-Q and 2026 for the N1 20SM. The transistor count is 45,900 million for the RTX 4090 Max-Q and unknown for the N1 20SM.

Head-to-Head Benchmarks

The recorded data contains no benchmark scores for either GPU, and there are no entries in the head-to-head benchmark results. Both GPUs have an average benchmark score of 0 and a percentile rank of 50 against all GPUs in the database. This means the comparison must rely on the specification-level measurements provided.

The most significant win for the RTX 4090 Max-Q is in FP32 compute: 28.31 TFLOPS compared to 12.01 TFLOPS, a difference of 16.30 TFLOPS, which is approximately 136% higher. This advantage carries into FP16, which is also 28.31 TFLOPS for the RTX 4090 Max-Q versus 12.01 TFLOPS for the N1 20SM. The pixel rate shows a similar pattern: 163.0 GPixel/s versus 56.30 GPixel/s, meaning the RTX 4090 Max-Q can fill pixels nearly three times faster. Texture rate is closer but still favors the RTX 4090 Max-Q at 442.3 GTexel/s versus 375.4 GTexel/s, a difference of 66.9 GTexel/s.

The N1 20SM's wins are in memory capacity and clock speed. The 128 GB memory capacity is eight times the 16 GB of the RTX 4090 Max-Q. The boost clock of 2346 MHz is 891 MHz higher than the 1455 MHz boost of the RTX 4090 Max-Q. The N1 20SM also has a newer PCIe interface (5.0 x16 versus 4.0 x16) and a newer release date (2026 versus 2023). However, these advantages do not translate into higher compute throughput in the recorded specifications.

The RTX 4090 Max-Q has more of every compute resource category: 7168 more shading units, 144 more TMUs, 88 more ROPs, 56 more ray tracing cores, and 224 more tensor cores. These resource advantages directly explain the higher pixel and texture rates. The N1 20SM's higher boost clock partially compensates for its smaller shader count, but the overall FP32 throughput remains 16.30 TFLOPS lower.

Where Each One Wins

The RTX 4090 Max-Q wins in scenarios that demand high compute throughput and graphics rendering. Its FP32 and FP16 performance of 28.31 TFLOPS makes it suitable for shader-intensive applications, real-time ray tracing workloads (with 76 ray tracing cores), and tensor-based operations (with 304 tensor cores). The higher pixel rate of 163.0 GPixel/s and texture rate of 442.3 GTexel/s support high-resolution rendering and detailed texture filtering. The 576.0 GB/s memory bandwidth enables fast data movement for large textures and frame buffers. The support for DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4 means it can run modern graphics applications across standard APIs. This GPU is positioned for gaming laptops and mobile workstations where graphics performance is the priority.

The N1 20SM wins in scenarios where memory capacity is the limiting factor. Its 128 GB LPDDR5X memory pool is eight times larger than the RTX 4090 Max-Q's 16 GB GDDR6, which allows it to hold very large datasets, massive AI model weights, or extensive in-memory databases that would exceed the RTX 4090 Max-Q's capacity. The PCIe 5.0 x16 interface provides a newer platform connection standard. The higher boost clock of 2346 MHz may benefit workloads that scale with clock frequency rather than raw shader count. The lack of recorded API support (DirectX N/A, OpenGL N/A, Vulkan N/A) suggests the N1 20SM is not intended for traditional graphics APIs, so its wins are in compute or memory-bound tasks rather than gaming or graphics rendering. The 1x HDMI display output indicates limited display connectivity compared to the portable device dependent outputs of the RTX 4090 Max-Q.

The transistor density difference (121.1M per mm² for the RTX 4090 Max-Q, unknown for the N1 20SM) and die size difference (379 mm² versus 382 mm²) show that the N1 20SM packs its large memory interface and Blackwell 2.0 architecture into a slightly larger die. The RTX 4090 Max-Q's 80 W TDP gives a power envelope, while the N1 20SM's TDP is unknown, making direct power comparisons impossible from the recorded data. Overall, the RTX 4090 Max-Q is the choice for graphics-heavy workloads, and the N1 20SM is the choice for memory-capacity-driven compute tasks.