AMD Radeon R7 M445 vs NVIDIA Quadro K620M Comparison

NVIDIA Quadro K620M and AMD Radeon R7 M445 are both end-of-life mobile graphics solutions, but they serve different segments. The Quadro K620M is a professional mobile workstation part, while the Radeon R7 M445 is a mainstream consumer GPU. In the database’s single recorded OpenCL benchmark, the Quadro K620M scores 5957 points, placing it in the 34th percentile of all GPUs, while the Radeon R7 M445 scores 5358 points, placing it in the 31st percentile. The 11.2% performance gap in favor of the Quadro K620M is the defining statistic, but architectural and feature differences matter more for specific workloads.

The Verdict

The data points to the NVIDIA Quadro K620M as the stronger compute performer. Its Geekbench OpenCL score of 5957 beats the AMD Radeon R7 M445’s 5358 by 11.2%, a clear margin. The Quadro also sits higher in the overall percentile ranking (34th vs. 31st), meaning it outranks a larger share of the GPU population. For users running OpenCL-accelerated tasks, the Quadro K620M is the safer pick based on recorded measurements.

However, the Radeon R7 M445 is not without merit. It offers 4 GB of GDDR5 memory compared to the Quadro’s 2 GB of DDR3, and its memory bandwidth of 32.00 GB/s is exactly double the Quadro’s 16.02 GB/s. This suggests the Radeon is better suited for workloads that are memory-capacity or bandwidth sensitive, even if its raw compute score is lower. The Radeon also supports DirectX 12 (12_0) fully, while the Quadro only supports DirectX 12 (11_0), which could matter for newer gaming or graphics APIs.

For professional workstation tasks where OpenCL compute is the bottleneck, the Quadro K620M wins decisively. For consumer scenarios prioritizing memory capacity and bandwidth, the Radeon R7 M445 has a structural advantage, though no benchmark in the database confirms a real-world win for it. The recorded data shows one win for the Quadro and zero for the Radeon, so the verdict leans heavily toward NVIDIA.

Architecture Differences

The two GPUs come from different architectural lineages. The NVIDIA Quadro K620M uses the GM108S chip built on the Maxwell architecture, with a 28 nm process node from TSMC. It packs 1,020 million transistors into a 77 mm² die, yielding a transistor density of 13.2 million per mm². The AMD Radeon R7 M445 uses the Meso chip based on GCN 3.0, also on a 28 nm TSMC process, but with 1,550 million transistors on a larger 125 mm² die, giving a lower density of 12.4 million per mm².

Core configurations differ significantly. The Quadro K620M has 384 shading units, 16 texture mapping units (TMUs), and 8 raster operation units (ROPs). The Radeon R7 M445 has fewer shading units at 320, but more TMUs at 20, and the same 8 ROPs. Clock speeds also diverge: the Quadro runs at a base of 1029 MHz with a boost of 1124 MHz, while the Radeon runs at 780 MHz base and 920 MHz boost. This explains the Quadro’s higher pixel rate of 8.992 GPixel/s versus 7.360 GPixel/s, and its higher texture rate of 17.98 GTexel/s versus 18.40 GTexel/s for the Radeon, which manages to match or exceed texture throughput despite lower clocks due to more TMUs.

The memory subsystems are entirely different. The Quadro uses 2 GB of DDR3 on a 64-bit bus, delivering 16.02 GB/s bandwidth. The Radeon uses 4 GB of GDDR5 on the same 64-bit bus, delivering 32.00 GB/s bandwidth. The Radeon also has a 1:1 FP16 ratio at 588.8 GFLOPS, while the Quadro lists no FP16 capability. Both support OpenGL 4.6, but the Radeon’s Vulkan support is version 1.2.170 versus the Quadro’s 1.4.

Head-to-Head Benchmarks

The only recorded head-to-head test is Geekbench OpenCL, and the NVIDIA Quadro K620M wins it outright. The Quadro scores 5957 against the Radeon’s 5358, a delta of 11.2% in favor of NVIDIA. This is a substantial margin for a single benchmark, and it aligns with the Quadro’s higher shading unit count (384 vs. 320) and higher clock speeds (1029 MHz base vs. 780 MHz base).

Looking at the nearest rivals contextualizes this result. The Quadro K620M sits between the AMD Radeon HD 8730M (5955, 0% delta) and the AMD Radeon HD 8750M (5970, -0.2% delta), meaning it is essentially tied with those older parts. It also trails the NVIDIA Quadro K4000 (5982, -0.4% delta) by a hair. The Radeon R7 M445, meanwhile, is bracketed by the Intel UHD Graphics P630 (5370, -0.2% delta) and the NVIDIA GeForce 840M (5322, 0.7% delta). The Radeon’s closest rival is actually the NVIDIA GeForce GTX 980M (5308, 0.9% delta), which is a high-end part from a different generation, showing the Radeon’s score is surprisingly competitive with a much more powerful GPU in this specific OpenCL workload.

The 11.2% delta between the two items is the largest gap in any comparison involving these two GPUs. The Quadro’s nearest rivals are all within 0.5% of its score, while the Radeon’s nearest rivals range from -0.2% to 0.9%, indicating the Radeon is in a tighter cluster with more variance. The Quadro’s advantage appears consistent, not marginal.

FAQ

Q: Which GPU has the higher OpenCL benchmark score?

A: The NVIDIA Quadro K620M scores 5957 in Geekbench OpenCL, which is 11.2% higher than the AMD Radeon R7 M445’s score of 5358.

Q: How much memory does each GPU have?

A: The NVIDIA Quadro K620M has 2 GB of DDR3 memory, while the AMD Radeon R7 M445 has 4 GB of GDDR5 memory.

Q: What is the memory bandwidth difference?

A: The Radeon R7 M445 delivers 32.00 GB/s bandwidth, exactly double the Quadro K620M’s 16.02 GB/s, despite both using a 64-bit memory bus.

Q: Which GPU has more shading units?

A: The NVIDIA Quadro K620M has 384 shading units, compared to 320 on the AMD Radeon R7 M445.

Q: What are the DirectX support levels?

A: The AMD Radeon R7 M445 supports DirectX 12 (12_0), while the NVIDIA Quadro K620M supports DirectX 12 (11_0), a lower feature level.

Q: How do these GPUs rank among all GPUs?

A: The Quadro K620M is in the 34th percentile of all GPUs, while the Radeon R7 M445 is in the 31st percentile.

Where Each One Wins

The NVIDIA Quadro K620M wins in raw compute performance. Its Geekbench OpenCL score of 5957 is 11.2% higher, and it has more shading units (384 vs. 320), higher base and boost clocks (1029/1124 MHz vs. 780/920 MHz), and a higher pixel rate (8.992 GPixel/s vs. 7.360 GPixel/s). It also supports a newer Vulkan version (1.4 vs. 1.2.170), which could benefit compute or rendering workloads that leverage that API. The Quadro’s 34th percentile ranking versus the Radeon’s 31st reinforces its overall standing.

The AMD Radeon R7 M445 wins on memory-related metrics. It has 4 GB of memory versus 2 GB, GDDR5 versus DDR3, and 32.00 GB/s bandwidth versus 16.02 GB/s. Its texture rate of 18.40 GTexel/s also edges past the Quadro’s 17.98 GTexel/s, thanks to 20 TMUs versus 16. The Radeon also has a 1:1 FP16 capability at 588.8 GFLOPS, which the Quadro lacks entirely. These features favor workloads that are bandwidth-bound, texture-heavy, or require half-precision math, even though the recorded benchmark does not capture such a win.

The Radeon also supports DirectX 12 (12_0) feature level, which is a higher tier than the Quadro’s DirectX 12 (11_0). For modern gaming or graphics applications that require the full DirectX 12 feature set, the Radeon has a compatibility advantage. However, the database records zero benchmark wins for the Radeon, so these advantages remain theoretical based on specifications alone.

Specification Differences

| Specification | NVIDIA Quadro K620M | AMD Radeon R7 M445 |

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

| Chip | GM108S | Meso |

| Architecture | Maxwell | GCN 3.0 |

| Process Node | 28 nm | 28 nm |

| Transistors | 1,020 million | 1,550 million |

| Die Size | 77 mm² | 125 mm² |

| Transistor Density | 13.2M / mm² | 12.4M / mm² |

| Base Clock | 1029 MHz | 780 MHz |

| Boost Clock | 1124 MHz | 920 MHz |

| Memory Size | 2 GB | 4 GB |

| Memory Type | DDR3 | GDDR5 |

| Memory Bus Width | 64 bit | 64 bit |

| Memory Bandwidth | 16.02 GB/s | 32.00 GB/s |

| Shading Units | 384 | 320 |

| TMUs | 16 | 20 |

| ROPs | 8 | 8 |

| Pixel Rate | 8.992 GPixel/s | 7.360 GPixel/s |

| Texture Rate | 17.98 GTexel/s | 18.40 GTexel/s |

| FP32 | 863.2 GFLOPS | 588.8 GFLOPS |

| FP16 | Not listed | 588.8 GFLOPS (1:1) |

| DirectX | 12 (11_0) | 12 (12_0) |

| Vulkan | 1.4 | 1.2.170 |

| Bus Interface | MXM-A (3.0) | PCIe 3.0 x8 |

| Slot Width | MXM Module | IGP |

| Release Date | 2015-02-28 | 2016-05-14 |

The two GPUs share the same process node and foundry, but differ on nearly every other specification. The Radeon has a larger die and more transistors, but the Quadro achieves a higher transistor density. The Quadro has higher clocks and more shading units, while the Radeon counters with more TMUs, more memory, faster memory, and double the bandwidth. The Radeon also has a higher DirectX feature level and FP16 support, while the Quadro offers a newer Vulkan version and a higher FP32 throughput of 863.2 GFLOPS versus 588.8 GFLOPS. The Radeon was released later, in 2016-05-14 versus 2015-02-28, but both are now end-of-life products.