AMD Radeon 820M vs NVIDIA B300 SXM6 AC Comparison

Head-to-Head Benchmarks

The benchmark data for these two parts is sparse, with no direct head-to-head tests recorded in the database. However, the NVIDIA B300 SXM6 AC has a single recorded Geekbench OpenCL score of 369,831. This result places it in the 100th percentile of all GPUs tracked, meaning it outperforms every other recorded part in the database.

The B300 SXM6 AC sits 7% ahead of the NVIDIA B200, which scores 345,482. It is 10.4% ahead of the NVIDIA H200 NVL, which scores 334,891. Against the AMD Instinct MI300X, the B300 SXM6 AC leads by 16.3%, with that rival scoring 317,994. The largest gap in the nearest rival set is against the NVIDIA L40S, where the B300 SXM6 AC is 25% ahead, as the L40S scores 295,763.

The AMD Radeon 820M has no recorded benchmark scores in the database. Its percentile rank is 50, which is the median position, but this is based on no actual test results. The data shows that the 820M has an average benchmark score of zero, while the B300 SXM6 AC has an average score of 369,831. The wins column confirms the split: the B300 SXM6 AC holds one win, the 820M holds none.

Architecture Differences

The two GPUs come from different manufacturers and target entirely different market segments. The AMD Radeon 820M is an integrated graphics processor built on the Krackan Point 2 chip, using the RDNA 3.5 architecture. It is part of the Navi III IGP generation, specifically the Strix Point Mobile line. The process node is 4 nm at TSMC. The transistor count and die size are not recorded in the database.

The NVIDIA B300 SXM6 AC is a discrete server module built on the GB110 chip, using the Blackwell Ultra architecture. It belongs to the Server Blackwell generation. The process node is 5 nm, also at TSMC. The database records 208,000 million transistors on a die size of 1628 mm², giving a transistor density of 127.8 million transistors per square millimeter.

Core counts differ massively. The 820M has 128 shading units, 8 texture mapping units, and 4 render output units. It also has 2 ray tracing cores and no tensor cores. The B300 SXM6 AC has 18,944 shading units, 592 texture mapping units, and 24 render output units. It has no ray tracing cores listed, but has 592 tensor cores.

Clock speeds show the server part runs higher. The 820M has a base clock of 400 MHz and a boost clock of 2800 MHz. The B300 SXM6 AC has a base clock of 1665 MHz and a boost clock of 2032 MHz. The memory clock for the B300 SXM6 AC is 2000 MHz, stated as 8 Gbps effective.

Memory configurations are not comparable. The 820M uses system shared memory, with the bus width and bandwidth also system dependent. The B300 SXM6 AC uses 288 GB of HBM3e memory on an 8192-bit bus, delivering 8.19 TB/s of bandwidth.

Compute throughput is where the server part dominates. The 820M delivers 716.8 GFLOPS for both FP32 and FP16 at a 1:1 ratio. The B300 SXM6 AC delivers 76.99 TFLOPS for both FP32 and FP16. The B300 SXM6 AC also has a texture rate of 1,202.9 GTexel/s and a pixel rate of 48.77 GPixel/s, versus 22.40 GTexel/s and 11.20 GPixel/s for the 820M.

Power and form factor differ by design intent. The 820M has a 15 W TDP, is an IGP with no power connectors, and uses a PCIe 4.0 x8 interface. The B300 SXM6 AC has a 1100 W TDP, is an SXM module, and uses a PCIe 6.0 x16 interface. The suggested PSU for the B300 SXM6 AC is 1500 W, while the 820M has no suggested PSU listed.

Display outputs are also different. The 820M has outputs that depend on the portable device, while the B300 SXM6 AC has no outputs at all. API support is limited for the server part: the B300 SXM6 AC lists DirectX, OpenGL, and Vulkan as N/A. The 820M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4.

The Verdict

The database shows a clear performance hierarchy. The NVIDIA B300 SXM6 AC is a top-tier compute part, sitting in the 100th percentile with a recorded Geekbench OpenCL score of 369,831. It leads its nearest rivals by margins from 7% to 25%. The AMD Radeon 820M has no recorded benchmarks and sits at the 50th percentile with a zero average score.

For raw compute workloads, the B300 SXM6 AC is the only part with data to support a verdict. Its tensor cores, 288 GB of HBM3e memory, and 76.99 TFLOPS of FP32 throughput align with server-class expectations. The 820M is an integrated GPU for portable devices, with 128 shading units and system shared memory, which makes it suitable for basic graphics tasks but not for the compute density of the B300 SXM6 AC.

The release dates confirm the generation gap. The 820M launched on 2025-02-28, while the B300 SXM6 AC launched later on 2025-09-10. The B300 SXM6 AC has a successor listed as Server Rubin, while the 820M has none. The predecessor of the B300 SXM6 AC is Server Hopper, while the 820M's predecessor is Navi II IGP.

Specification Differences

The table below lists only the fields where the two parts differ:

| Specification | AMD Radeon 820M | NVIDIA B300 SXM6 AC |

|---|---|---|

| Manufacturer | AMD | NVIDIA |

| Chip | Krackan Point 2 | GB110 |

| Architecture | RDNA 3.5 | Blackwell Ultra |

| Generation | Navi III IGP (Strix Point Mobile) | Server Blackwell (Bxx) |

| Process Node | 4 nm | 5 nm |

| Transistors | unknown | 208,000 million |

| Die Size | unknown | 1628 mm² |

| Transistor Density | null | 127.8M / mm² |

| Base Clock | 400 MHz | 1665 MHz |

| Boost Clock | 2800 MHz | 2032 MHz |

| Memory Clock | System Shared | 2000 MHz 8 Gbps effective |

| Memory Size | System Shared | 288 GB |

| Memory Type | System Shared | HBM3e |

| Memory Bus Width | System Shared | 8192 bit |

| Memory Bandwidth | System Dependent | 8.19 TB/s |

| Shading Units | 128 | 18944 |

| TMUs | 8 | 592 |

| ROPs | 4 | 24 |

| RT Cores | 2 | null |

| Tensor Cores | null | 592 |

| Pixel Rate | 11.20 GPixel/s | 48.77 GPixel/s |

| Texture Rate | 22.40 GTexel/s | 1,202.9 GTexel/s |

| FP32 | 716.8 GFLOPS | 76.99 TFLOPS |

| FP16 | 716.8 GFLOPS (1:1) | 76.99 TFLOPS (1:1) |

| TDP | 15 W | 1100 W |

| Slot Width | IGP | SXM Module |

| Power Connectors | None | null |

| Suggested PSU | null | 1500 W |

| Bus Interface | PCIe 4.0 x8 | PCIe 6.0 x16 |

| Display Outputs | Portable Device Dependent | No outputs |

| DirectX | 12 Ultimate (12_2) | N/A |

| OpenGL | 4.6 | N/A |

| Vulkan | 1.4 | N/A |

| Release Date | 2025-02-28 | 2025-09-10 |

| Predecessor | Navi II IGP | Server Hopper |

| Successor | null | Server Rubin |

| Percentile | 50 | 100 |

| Avg Benchmark Score | 0 | 369831 |

FAQ

Q: Which GPU has the higher recorded benchmark score?

A: The NVIDIA B300 SXM6 AC has a Geekbench OpenCL score of 369,831. The AMD Radeon 820M has no recorded benchmark scores, with an average score of zero.

Q: How does the B300 SXM6 AC compare to its nearest rivals?

A: It is 7% ahead of the NVIDIA B200, 10.4% ahead of the NVIDIA H200 NVL, 16.3% ahead of the AMD Instinct MI300X, and 25% ahead of the NVIDIA L40S.

Q: What memory configurations do the two parts use?

A: The 820M uses system shared memory with system dependent bandwidth. The B300 SXM6 AC uses 288 GB of HBM3e memory on an 8192-bit bus with 8.19 TB/s bandwidth.

Q: What are the FP32 compute capabilities?

A: The 820M delivers 716.8 GFLOPS. The B300 SXM6 AC delivers 76.99 TFLOPS.

Q: Do both parts support the same APIs?

A: No. The 820M supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The B300 SXM6 AC lists all three as N/A.

Q: What is the TDP of each part?

A: The 820M has a 15 W TDP. The B300 SXM6 AC has a 1100 W TDP with a suggested PSU of 1500 W.

Where Each One Wins

The NVIDIA B300 SXM6 AC wins on every measured performance metric in the database. Its Geekbench OpenCL score of 369,831 places it in the 100th percentile, meaning it outperforms all other GPUs tracked. It leads the NVIDIA B200 by 7%, the NVIDIA H200 NVL by 10.4%, the AMD Instinct MI300X by 16.3%, and the NVIDIA L40S by 25%. The 76.99 TFLOPS FP32 throughput and 8.19 TB/s memory bandwidth indicate suitability for large-scale compute workloads, particularly those that can use its 592 tensor cores.

The AMD Radeon 820M has no recorded benchmark wins. Its strengths are limited to its form factor and power profile. The 15 W TDP and IGP slot width make it appropriate for portable devices, and its display outputs are dependent on the portable device, indicating integration into mobile systems. The 4 nm process node and RDNA 3.5 architecture provide a modern foundation, but without benchmark data, no performance claims can be made from the database.

The use-case split is clear from the architecture. The B300 SXM6 AC targets server environments with no display outputs and a PCIe 6.0 x16 interface. The 820M targets mobile devices with system shared memory and a PCIe 4.0 x8 interface. The B300 SXM6 AC also has a successor, Server Rubin, while the 820M does not, indicating the server part is in a more active product cycle.