AMD Radeon RX 6450M vs NVIDIA N1 20SM Comparison

Head-to-Head Benchmarks

The recorded data contains no head-to-head benchmark results for the AMD Radeon RX 6450M and the NVIDIA N1 20SM. Neither GPU has an average benchmark score, and the wins counter shows zero for both parts. The database lists both products at the 50th percentile against all GPUs, which indicates a mid-pack placement, but without measured scores, direct performance comparison is not possible from the available figures.

What the data does show is a substantial difference in raw compute specifications. The NVIDIA N1 20SM delivers 12.01 TFLOPS of FP32 throughput, which is 3.2 times the 3.779 TFLOPS of the AMD Radeon RX 6450M. The texture rate difference is even larger: the N1 20SM processes 375.4 GTexel/s versus 118.1 GTexel/s for the AMD part, a 3.2x advantage. Pixel fill rates, however, favor the AMD GPU. The RX 6450M achieves 78.72 GPixel/s while the N1 20SM manages 56.30 GPixel/s, giving AMD a 1.4x lead in pixel throughput.

Memory bandwidth strongly favors the NVIDIA part. The N1 20SM has 273.2 GB/s of bandwidth from a 256-bit LPDDR5X interface, compared to 128.0 GB/s on a 64-bit GDDR6 bus for the RX 6450M. That is a 2.1x bandwidth advantage for NVIDIA. The N1 20SM also carries 128 GB of memory versus 4 GB, a 32x capacity difference.

Clock behavior differs meaningfully. The AMD GPU has a base clock of 2000 MHz and a boost clock of 2460 MHz, with a game clock of 2220 MHz. The NVIDIA part starts at just 741 MHz base but boosts to 2346 MHz. The RX 6450M therefore runs at a higher sustained clock, while the N1 20SM relies on a much larger shader count to generate its compute lead.

Architecture Differences

The two GPUs come from different manufacturers and different architectural generations. AMD uses the Navi 24 chip built on RDNA 2.0, fabricated by TSMC on a 6 nm process. The die measures 107 mm² and contains 5,400 million transistors, giving a transistor density of 50.5 million per square millimeter. NVIDIA uses the GB20B chip built on Blackwell 2.0, also fabricated by TSMC but on a 5 nm process. The die is substantially larger at 382 mm², though transistor count is listed as unknown in the database.

Shading resources differ sharply. The RX 6450M has 768 shading units, 48 texture mapping units, and 32 ROPs. The N1 20SM has 2560 shading units, 160 TMUs, and 24 ROPs. NVIDIA therefore has 3.3x the shading units and 3.3x the texture units, while AMD has 1.3x the ROP count. The ray tracing configuration also differs: AMD includes 12 ray accelerators, while NVIDIA includes 20 RT cores. NVIDIA additionally packs 80 tensor cores, a resource AMD does not list for this part.

Memory architecture is fundamentally different. The RX 6450M uses 4 GB of GDDR6 with a 64-bit bus, running at 2000 MHz memory clock with 16 Gbps effective data rate. The N1 20SM uses 128 GB of LPDDR5X with a 256-bit bus, running at 1067 MHz with 8.5 Gbps effective data rate. The NVIDIA memory clock is lower but the bus width is four times larger, producing the bandwidth advantage noted earlier.

The system interface differs as well. AMD uses PCIe 4.0 x4, while NVIDIA uses PCIe 5.0 x16. That is a 4x difference in lane count and a generation newer interconnect for the NVIDIA part. Display output is portable-device dependent for AMD, while NVIDIA lists a single HDMI output.

Power and physical configuration also separate the two. The RX 6450M has a TDP of 50 W and requires no power connectors. The N1 20SM has an unknown TDP but also uses no power connectors. Both are IGP slot width devices, meaning they are integrated graphics solutions rather than discrete cards.

API support shows a notable gap. The AMD part supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The NVIDIA part lists N/A for DirectX, OpenGL, and Vulkan in the database. This suggests the N1 20SM may not expose standard graphics APIs in the same manner, possibly indicating a different software stack or a design targeting specific workloads rather than general-purpose rendering.

FP16 throughput also differs in ratio. AMD achieves 7.557 TFLOPS FP16 with a 2:1 ratio relative to FP32, meaning it doubles its rate. NVIDIA achieves 12.01 TFLOPS FP16 with a 1:1 ratio, meaning FP16 runs at the same speed as FP32. The absolute FP16 number still favors NVIDIA by 1.6x, but the architectural approach is different: AMD uses paired FP16 execution, while NVIDIA appears to run both precision modes at identical throughput.

Where Each One Wins

The RX 6450M wins in pixel fill rate. Its 78.72 GPixel/s exceeds the N1 20SM's 56.30 GPixel/s by 1.4x. This matters for rasterized output at high resolutions, where ROP throughput limits how many pixels can be written per second. The AMD part also has a higher boost clock at 2460 MHz versus 2346 MHz, which helps in latency-sensitive scenarios that do not scale with core count.

The N1 20SM wins in compute throughput across the board. FP32 performance is 12.01 TFLOPS versus 3.779 TFLOPS, a 3.2x lead. Texture rate is 375.4 GTexel/s versus 118.1 GTexel/s, also 3.2x. The 2560 shading units provide substantially more parallel execution capacity. The 80 tensor cores give the NVIDIA part a dedicated matrix computation resource that the AMD GPU lacks entirely, which suggests an advantage for workloads involving neural network inference or training.

Memory capacity and bandwidth favor NVIDIA decisively. The 128 GB of LPDDR5X memory compared to 4 GB of GDDR6 means the N1 20SM can hold far larger datasets in local memory. The 273.2 GB/s bandwidth versus 128.0 GB/s means it can feed those data to compute units faster. For workloads with large working sets, such as machine learning training or data-parallel processing, this is a significant advantage. The PCIe 5.0 x16 interface also allows faster data transfer to and from the host system compared to PCIe 4.0 x4.

The RX 6450M has a 50 W TDP, which is a known figure, while the N1 20SM has an unknown TDP. The AMD part therefore has a clearly documented power envelope for thermal design. Both are IGP devices with no power connectors, meaning they draw power through the motherboard or system board rather than dedicated GPU power inputs.

The Verdict

The data indicates two GPUs with different design goals. The AMD Radeon RX 6450M is a low-power integrated solution with a defined 50 W TDP, a compact 107 mm² die on a 6 nm process, and support for standard graphics APIs including DirectX 12 Ultimate and Vulkan 1.4. It delivers competitive pixel fill rate and a high boost clock, but its compute resources are limited to 768 shading units and 3.779 TFLOPS FP32.

The NVIDIA N1 20SM is a larger integrated GPU with 2560 shading units, 80 tensor cores, 128 GB of memory, and 12.01 TFLOPS FP32. Its 382 mm² die on a 5 nm process is more than three times the physical size of the AMD chip. The memory configuration with 256-bit LPDDR5X and 273.2 GB/s bandwidth positions it for data-intensive workloads. However, its API support is listed as N/A, which limits its role as a general-purpose graphics processor in traditional gaming or rendering applications.

Picking a winner depends entirely on workload. For rasterization-heavy tasks where pixel throughput and standard graphics API compatibility are required, the RX 6450M has the higher pixel rate and full DirectX 12 Ultimate support. For compute-heavy tasks such as tensor operations, large memory footprints, or high-bandwidth data movement, the N1 20SM has overwhelming advantages in shader count, tensor cores, memory capacity, and bandwidth.

The 50th percentile ranking for both GPUs against all GPUs suggests neither is at the extreme high or low end of the overall distribution. Without benchmark scores or head-to-head results, the database cannot rank one above the other in absolute performance. The available specifications indicate the N1 20SM is the more powerful compute device, while the RX 6450M is the more conventional graphics solution with broader API coverage.

FAQ

Q: Which GPU has higher FP32 compute performance?

A: The NVIDIA N1 20SM delivers 12.01 TFLOPS of FP32, which is 3.2 times the 3.779 TFLOPS of the AMD Radeon RX 6450M.

Q: How do the memory capacities compare?

A: The N1 20SM has 128 GB of LPDDR5X memory, while the RX 6450M has 4 GB of GDDR6. The NVIDIA part has 32 times the memory capacity.

Q: Which GPU offers higher memory bandwidth?

A: The N1 20SM achieves 273.2 GB/s over a 256-bit bus, while the RX 6450M achieves 128.0 GB/s over a 64-bit bus. NVIDIA has a 2.1x bandwidth advantage.

Q: Does the AMD GPU support DirectX 12 Ultimate?

A: Yes, the RX 6450M supports DirectX 12 Ultimate (12_2), along with OpenGL 4.6 and Vulkan 1.4. The N1 20SM lists N/A for DirectX, OpenGL, and Vulkan support.

Q: What is the pixel fill rate difference?

A: The RX 6450M has a pixel rate of 78.72 GPixel/s, which is 1.4 times the 56.30 GPixel/s of the N1 20SM. AMD wins in this metric.

Q: Do both GPUs use integrated graphics form factors?

A: Yes, both are listed with IGP slot width and no power connectors. The RX 6450M has a documented TDP of 50 W, while the N1 20SM has an unknown TDP.