AMD Radeon RX 6650M XT vs NVIDIA A100 SXM4 80 GB Comparison

Head-to-Head Benchmarks

The recorded data places the NVIDIA A100 SXM4 80 GB and the AMD Radeon RX 6650M XT in different performance strata, with the A100 holding a commanding lead in the available benchmark results. The A100 SXM4 80 GB scores 183,725 points in Geekbench Vulkan, while the RX 6650M XT scores 76,904 points in Geekbench OpenCL. While these are different test suites, the database’s average benchmark score shows a similar gap: the A100 sits at 183,725, and the RX 6650M XT sits at 76,904.

The A100 SXM4 80 GB ranks in the 98th percentile of all GPUs, placing it among the top tier of recorded hardware. Its nearest rivals include the NVIDIA RTX 5000 Ada Generation at 184,664 (0.5% ahead), the NVIDIA RTX PRO 5000 Blackwell at 182,109 (0.9% behind), and the NVIDIA A100 SXM4 40 GB at 187,147 (1.8% ahead). The data shows the A100 80 GB is effectively neck-and-neck with these datacenter-class cards, with deltas under 2% in either direction. It also leads the NVIDIA GeForce RTX 4090 D, which scores 178,050, by 3.2%.

The RX 6650M XT, by contrast, ranks in the 91st percentile, which is still strong for a mobile part but far below the A100’s standing. Its nearest rivals are all within a narrow band: the NVIDIA GeForce RTX 5090 D at 77,712 (1% ahead), the AMD Radeon RX 6850M XT at 78,940 (2.6% ahead), and the NVIDIA Tesla P100 PCIe 12 GB at 79,396 (3.1% ahead). The RX 6650M XT trails the Tesla P100 PCIe 16 GB, which scores 79,605, by 3.4%. This clustering suggests the RX 6650M XT is competitive with high-end laptop GPUs and older datacenter accelerators, but it is not in the same league as the A100.

The raw score difference is substantial: the A100’s 183,725 versus the RX 6650M XT’s 76,904 represents a gap of roughly 139% in favor of the A100. While the benchmarks are not identical (Vulkan versus OpenCL), the database’s average benchmark score confirms the trend. No head-to-head benchmark entries exist in the database, so the comparison relies on these separate test results and the percentile rankings.

Where Each One Wins

The A100 SXM4 80 GB wins decisively in raw compute throughput. Its FP32 performance is 19.49 TFLOPS, roughly double the RX 6650M XT’s 9.896 TFLOPS. The gap widens dramatically in FP16: the A100 delivers 77.97 TFLOPS (4:1 ratio), while the RX 6650M XT manages 19.79 TFLOPS (2:1 ratio). That is nearly a 4x advantage for the A100 in half-precision workloads, which matters for AI training and scientific simulation.

The A100 also dominates in memory capacity and bandwidth. It has 80 GB of HBM2e across a 5120-bit bus, yielding 2.04 TB/s of bandwidth. The RX 6650M XT has 8 GB of GDDR6 on a 128-bit bus, with 256.0 GB/s. The A100 offers 10x the memory capacity and 8x the bandwidth. For large datasets, model weights, or in-memory databases, the A100 is the clear choice.

The RX 6650M XT wins in efficiency and portability. Its TDP is 120 W, versus 400 W for the A100. It is an IGP (integrated graphics processor) form factor, while the A100 is an OAM module. The RX 6650M XT also has display outputs (portable device dependent), whereas the A100 has no outputs at all. For mobile workstations or compact systems, the RX 6650M XT is the only viable option of the two.

The RX 6650M XT also brings hardware ray tracing with 32 RT cores, a feature the A100 lacks entirely. Its API support is broader for consumer workloads: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The A100’s API fields are null in the database, meaning no DirectX, OpenGL, or Vulkan support is recorded. For gaming or graphics rendering on consumer software, the RX 6650M XT is functionally superior.

Architecture Differences

The two GPUs come from different architectural lineages. The A100 uses the GA100 chip, built on Ampere architecture, part of the Server Ampere (Axx) generation. It is fabricated on a 7 nm process at TSMC, with 54,200 million transistors on an 826 mm² die. That yields a transistor density of 65.6 million per mm². The RX 6650M XT uses the Navi 23 chip, built on RDNA 2.0, part of the Navi Mobile (RX 6000M) generation. It is also on a 7 nm TSMC process, but with 11,060 million transistors on a 237 mm² die, giving a density of 46.7 million per mm². The A100 packs nearly 5x the transistors into 3.5x the die area.

Core configurations differ sharply. The A100 has 6,912 shading units, 432 TMUs, 160 ROPs, and 432 tensor cores. It has no RT cores. The RX 6650M XT has 2,048 shading units, 128 TMUs, 64 ROPs, and 32 RT cores. It has no tensor cores. The A100’s tensor cores are critical for AI workloads, while the RX 6650M XT’s RT cores handle ray tracing. The A100’s shading unit count is 3.4x higher, and its TMU and ROP counts are 3.4x and 2.5x higher, respectively.

Clock speeds tell a different story. The RX 6650M XT has a base clock of 2068 MHz and a boost clock of 2416 MHz, with a game clock of 2162 MHz. The A100 runs at 1275 MHz base and 1410 MHz boost. The RX 6650M XT’s higher clocks partially offset its lower core count, but the A100’s massive core advantage wins out in throughput. Memory clocks also differ: the A100 runs at 1593 MHz (3.2 Gbps effective) with HBM2e, while the RX 6650M XT runs at 2000 MHz (16 Gbps effective) with GDDR6.

The A100 supports PCIe 4.0 x16, while the RX 6650M XT uses PCIe 4.0 x8. The A100 has no power connectors (OAM module), with a suggested PSU of 800 W. The RX 6650M XT also has no power connectors (IGP), with no suggested PSU recorded. The A100’s pixel rate is 225.6 GPixel/s, and its texture rate is 609.1 GTexel/s. The RX 6650M XT’s pixel rate is 154.6 GPixel/s, and its texture rate is 309.2 GTexel/s.

The Verdict

The data is unambiguous: the NVIDIA A100 SXM4 80 GB is the superior compute platform, and the AMD Radeon RX 6650M XT is the superior mobile graphics solution. There is no contest in raw performance. The A100’s 183,725 benchmark score dwarfs the RX 6650M XT’s 76,904, and its 98th percentile ranking versus 91st confirms the gap. For datacenter AI, scientific computing, or any workload that can use tensor cores, the A100 is the choice. Its 80 GB memory and 2.04 TB/s bandwidth are unmatched by the RX 6650M XT’s 8 GB and 256.0 GB/s.

However, the A100 cannot be used for display output, has no consumer graphics APIs recorded, and consumes 400 W. The RX 6650M XT is a 120 W IGP with display outputs, DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4 support, plus hardware ray tracing. For a laptop, a compact workstation, or any system requiring graphics output, the RX 6650M XT is the only functional option. The A100 is an accelerator, not a graphics card.

The verdict from the database: pick the A100 for compute density, memory capacity, and AI throughput. Pick the RX 6650M XT for mobility, efficiency, and graphics features. Neither can substitute for the other in its respective domain.

FAQ

Q: Which GPU has higher raw FP32 performance?

A: The NVIDIA A100 SXM4 80 GB, with 19.49 TFLOPS, versus 9.896 TFLOPS for the AMD Radeon RX 6650M XT.

Q: How much memory bandwidth does each card provide?

A: The A100 SXM4 80 GB provides 2.04 TB/s via HBM2e, while the RX 6650M XT provides 256.0 GB/s via GDDR6.

Q: Does either GPU support ray tracing?

A: Only the AMD Radeon RX 6650M XT, which has 32 RT cores. The NVIDIA A100 has no RT cores.

Q: Which GPU has tensor cores?

A: The NVIDIA A100 SXM4 80 GB has 432 tensor cores. The AMD Radeon RX 6650M XT has none.

Q: What is the form factor difference?

A: The A100 is an OAM module with no display outputs, while the RX 6650M XT is an IGP with portable device dependent display outputs.

Q: How do their percentile rankings compare?

A: The A100 ranks in the 98th percentile of all GPUs, while the RX 6650M XT ranks in the 91st percentile.

Specification Differences

| Specification | NVIDIA A100 SXM4 80 GB | AMD Radeon RX 6650M XT |

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

| Architecture | Ampere | RDNA 2.0 |

| Generation | Server Ampere (Axx) | Navi Mobile (RX 6000M) |

| Die Size | 826 mm² | 237 mm² |

| Transistors | 54,200 million | 11,060 million |

| Transistor Density | 65.6M / mm² | 46.7M / mm² |

| Base Clock | 1275 MHz | 2068 MHz |

| Boost Clock | 1410 MHz | 2416 MHz |

| Memory Size | 80 GB | 8 GB |

| Memory Type | HBM2e | GDDR6 |

| Memory Bus | 5120 bit | 128 bit |

| Memory Bandwidth | 2.04 TB/s | 256.0 GB/s |

| Shading Units | 6912 | 2048 |

| TMUs | 432 | 128 |

| ROPs | 160 | 64 |

| RT Cores | None | 32 |

| Tensor Cores | 432 | None |

| FP32 Performance | 19.49 TFLOPS | 9.896 TFLOPS |

| FP16 Performance | 77.97 TFLOPS (4:1) | 19.79 TFLOPS (2:1) |

| Pixel Rate | 225.6 GPixel/s | 154.6 GPixel/s |

| Texture Rate | 609.1 GTexel/s | 309.2 GTexel/s |

| TDP | 400 W | 120 W |

| Slot Width | OAM Module | IGP |

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

| Display Outputs | No outputs | Portable Device Dependent |

| DirectX Support | None recorded | 12 Ultimate (12_2) |

| OpenGL Support | None recorded | 4.6 |

| Vulkan Support | None recorded | 1.4 |

| Release Date | 2020-11-15 | 2022-01-03 |

| Predecessor | Tesla Turing | Polaris Mobile |

| Successor | Server Ada | None |