AMD Instinct MI100 vs AMD Radeon RX 6650M XT Comparison

Head-to-Head Benchmarks

The recorded database contains one head-to-head benchmark result between these two AMD accelerators: Geekbench OpenCL. In that test, the AMD Instinct MI100 scores 139,035 points, while the AMD Radeon RX 665M XT scores 76,904 points. This represents an 80.8% advantage for the Instinct MI100, a decisive margin that places the two products in entirely different performance tiers.

To contextualize the MI100's result, its nearest rivals in the database are the NVIDIA Tesla V100 PCIe 16 GB (138,063, 0.7% behind), the NVIDIA Tesla V100 SXM2 32 GB (137,731, 0.9% behind), the AMD Radeon PRO V620 (136,472, 1.9% behind), and the AMD Radeon Pro W6800X Duo (135,774, 2.4% behind). The MI100 essentially matches the V100 class, sitting within 1% of both Tesla variants. Its 96th percentile among all GPUs reflects that it outperforms roughly 96% of recorded graphics processors.

The RX 6650M XT, by contrast, sits at the 91st percentile, but its nearest rivals tell a different story about proximity. The NVIDIA GeForce RTX 5090 D (77,712) is 1% ahead, the AMD Radeon RX 6850M XT (78,940) is 2.6% ahead, and the NVIDIA Tesla P100 PCIe 12 GB (79,396) and 16 GB (79,605) are 3.1% and 3.4% ahead respectively. The mobile GPU trails these four cards by small margins, but the gap to the MI100 is enormous: the desktop compute accelerator delivers nearly double the OpenCL score.

The delta percentage of 80.8% is not a near-miss or a slight edge; it is a fundamental separation in compute capability. No benchmark in the database shows the RX 6650M XT winning any test against the MI100. The wins tally confirms this: the MI100 holds 1 win, the RX 6650M XT holds 0.

Architecture Differences

The two chips share a manufacturer and a process node, but their architectural lineages diverge sharply. The AMD Instinct MI100 uses the Arcturus chip built on CDNA 1.0, a compute-optimized architecture designed for data center workloads. It integrates 25,600 million transistors on a 750 mm² die, yielding a transistor density of 34.1 million transistors per square millimeter. The RX 6650M XT uses the Navi 23 chip on RDNA 2.0, a graphics-focused architecture for mobile gaming, with 11,060 million transistors on a 237 mm² die and a higher density of 46.7 million per square millimeter.

The MI100's die is more than three times larger, but the RX 6650M XT packs transistors more densely. This reflects different design goals: the MI100 prioritizes raw compute throughput and memory bandwidth, while the RX 6650M XT optimizes for power efficiency and clock speed within a laptop thermal envelope.

Memory architecture is starkly different. The MI100 carries 32 GB of HBM2 on a 4096-bit bus, delivering 1.23 TB/s of bandwidth. The RX 6650M XT has 8 GB of GDDR6 on a 128-bit bus, yielding 256.0 GB/s. That is a 4.8x bandwidth advantage for the MI100, a factor that directly impacts compute-heavy workloads. The MI100's memory clock is 1200 MHz (2.4 Gbps effective), while the RX 6650M XT runs at 2000 MHz (16 Gbps effective).

Shader resources also favor the MI100 massively. The Instinct card has 7,680 shading units, 480 texture mapping units, and 64 ROPs. The RX 6650M XT has 2,048 shading units, 128 TMUs, and 64 ROPs. The MI100 has 3.75x the shading units and 3.75x the TMUs. However, the RX 6650M XT includes 32 ray tracing cores, a feature the MI100 lacks entirely.

Clock speeds reverse the trend. The RX 6650M XT has a base clock of 2,068 MHz, a game clock of 2,162 MHz, and a boost clock of 2,416 MHz. The MI100's base is 1,000 MHz and boost is 1,502 MHz. The mobile chip runs at roughly 1.6x the boost frequency, which helps close the compute gap but cannot overcome the massive shader and memory advantages of the MI100.

The MI100 reports no DirectX, OpenGL, or Vulkan API support, while the RX 6650M XT supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The RX 6650M XT also has display outputs (portable device dependent), whereas the MI100 has no display outputs at all. The MI100 is a compute-only accelerator; the RX 6650M XT is a full graphics solution.

FAQ

Q: Which GPU has higher OpenCL benchmark performance?

A: The AMD Instinct MI100 scores 139,035 in Geekbench OpenCL, versus 76,904 for the AMD Radeon RX 6650M XT. The MI100 leads by 80.8%.

Q: How does the MI100 compare to its nearest rival, the NVIDIA Tesla V100 PCIe 16 GB?

A: The MI100 scores 139,035, which is 0.7% higher than the Tesla V100 PCIe 16 GB's 138,063. The two are effectively tied in OpenCL performance.

Q: What is the memory bandwidth difference between these two cards?

A: The MI100 has 1.23 TB/s of bandwidth from 32 GB of HBM2 on a 4096-bit bus. The RX 6650M XT has 256.0 GB/s from 8 GB of GDDR6 on a 128-bit bus. The MI100 provides roughly 4.8x the memory bandwidth.

Q: Does the RX 6650M XT support ray tracing?

A: Yes, the RX 6650M XT includes 32 ray tracing cores. The MI100 does not list any ray tracing cores in the database.

Q: What is the transistor count and die size for each chip?

A: The MI100's Arcturus chip has 25,600 million transistors on a 750 mm² die. The RX 6650M XT's Navi 23 chip has 11,060 million transistors on a 237 mm² die.

Q: Which card has higher pixel and texture rates?

A: The RX 6650M XT has a higher pixel rate at 154.6 GPixel/s versus 96.13 GPixel/s for the MI100. However, the MI100 has a higher texture rate at 721.0 GTexel/s versus 309.2 GTexel/s for the RX 6650M XT.

Specification Differences

The table below highlights only the fields where the two AMD products differ according to the database.

| Specification | AMD Instinct MI100 | AMD Radeon RX 6650M XT |

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

| Chip | Arcturus | Navi 23 |

| Architecture | CDNA 1.0 | RDNA 2.0 |

| Generation | Instinct (MIx) | Navi Mobile (RX 6000M) |

| Transistors | 25,600 million | 11,060 million |

| Die Size | 750 mm² | 237 mm² |

| Transistor Density | 34.1M / mm² | 46.7M / mm² |

| Base Clock | 1000 MHz | 2068 MHz |

| Boost Clock | 1502 MHz | 2416 MHz |

| Game Clock | None | 2162 MHz |

| Memory Clock | 1200 MHz 2.4 Gbps effective | 2000 MHz 16 Gbps effective |

| Memory Size | 32 GB | 8 GB |

| Memory Type | HBM2 | GDDR6 |

| Memory Bus Width | 4096 bit | 128 bit |

| Memory Bandwidth | 1.23 TB/s | 256.0 GB/s |

| Shading Units | 7680 | 2048 |

| TMUs | 480 | 128 |

| Ray Tracing Cores | None | 32 |

| Pixel Rate | 96.13 GPixel/s | 154.6 GPixel/s |

| Texture Rate | 721.0 GTexel/s | 309.2 GTexel/s |

| FP32 | 23.07 TFLOPS | 9.896 TFLOPS |

| FP16 | 46.14 TFLOPS (2:1) | 19.79 TFLOPS (2:1) |

| TDP | 300 W | 120 W |

| Slot Width | Dual-slot | IGP |

| Power Connectors | 2x 8-pin | None |

| Suggested PSU | 700 W | None |

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

| Display Outputs | No outputs | Portable Device Dependent |

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

| OpenGL | N/A | 4.6 |

| Vulkan | N/A | 1.4 |

| Dimensions | 267 mm length, 111 mm height | No dimensions recorded |

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

| Predecessor | Radeon Instinct | Polaris Mobile |

| Geekbench OpenCL | 139035 | 76904 |

| Percentile | 96 | 91 |

Where Each One Wins

The AMD Instinct MI100 wins decisively in raw compute throughput. Its FP32 output is 23.07 TFLOPS versus 9.896 TFLOPS for the RX 6650M XT, and its FP16 output is 46.14 TFLOPS versus 19.79 TFLOPS. This is a 2.33x advantage in both precision formats. The MI100 also leads in texture rate (721.0 GTexel/s versus 309.2 GTexel/s), memory capacity (32 GB versus 8 GB), memory bandwidth (1.23 TB/s versus 256.0 GB/s), and shading units (7,680 versus 2,048). For any workload that scales with shader count, memory bandwidth, or FP32/FP16 throughput, the MI100 is the clear choice.

The RX 6650M XT wins in several specific areas. Its pixel rate of 154.6 GPixel/s exceeds the MI100's 96.13 GPixel/s by 60.7%, which favors fill-rate-bound graphics tasks. It has a much higher boost clock (2,416 MHz versus 1,502 MHz), making it more responsive for latency-sensitive interactive workloads. It includes 32 ray tracing cores, enabling hardware-accelerated ray tracing that the MI100 cannot perform. It supports DirectX 12 Ultimate, OpenGL 4.6, and Vulkan 1.4, whereas the MI100 reports no graphics API support. It also has display outputs, while the MI100 has none.

The RX 6650M XT consumes 120 W versus the MI100's 300 W, making it far more suitable for portable or power-constrained systems. Its IGP slot width and lack of power connectors mean it is designed for integration into laptops, whereas the MI100 is a dual-slot, 2x 8-pin card requiring a 700 W suggested PSU.

The Verdict

The database points to a straightforward conclusion: the AMD Instinct MI100 and the AMD Radeon RX 6650M XT serve fundamentally different purposes, and the choice depends entirely on workload type.

Anyone running compute-heavy data center tasks, scientific simulations, or OpenCL-based workloads should select the AMD Instinct MI100. Its 139,035 OpenCL score places it at the 96th percentile, and it outperforms the RX 6650M XT by 80.8% in the only shared benchmark. Its 32 GB of HBM2 memory with 1.23 TB/s bandwidth, 7,680 shading units, and 23.07 TFLOPS FP32 performance make it a serious compute accelerator. The lack of display outputs and graphics API support confirms that it is not intended for conventional rendering.

The AMD Radeon RX 6650M XT is the appropriate choice for mobile gaming or graphics workloads that require DirectX 12 Ultimate support, ray tracing, and display connectivity. Its 76,904 OpenCL score sits at the 91st percentile among all GPUs, which is respectable for a mobile part, but it trails the MI100 by a wide margin in pure compute. Its higher pixel rate, faster clocks, and 32 ray tracing cores make it better suited for rasterization and real-time rendering. Its 120 W TDP and IGP form factor enable laptop integration, a physical impossibility for the dual-slot, 300 W MI100.

The data does not support any scenario where the RX 6650M XT outperforms the MI100 in compute benchmarks. Conversely, the MI100 cannot function as a graphics card at all. The verdict: choose the MI100 for compute acceleration in a server or workstation chassis, and choose the RX 6650M XT for a mobile graphics solution with modern API support and ray tracing. These products do not compete; they occupy separate segments of the AMD lineup.