AMD Radeon R7 M445 vs NVIDIA Quadro K620 Comparison

Where Each One Wins

The benchmark database splits these two mobile and workstation-class GPUs across a single recorded OpenCL workload, and the results are unambiguous. The NVIDIA Quadro K620 takes the only head-to-head win, posting a Geekbench OpenCL score of 6693 against the AMD Radeon R7 M445’s 5358, a 24.9% advantage. That makes the Quadro K620 the clear pick for any compute-heavy task that leans on OpenCL acceleration, whether that means rendering, simulation, or general GPU compute in applications that still use that API.

The AMD Radeon R7 M445, by contrast, does not win any recorded benchmark in this comparison. Its single score of 5358 places it in the 31st percentile of all GPUs in the database, while the Quadro K620 sits at the 36th percentile. The R7 M445’s loss is not a narrow one; the 24.9% gap is substantial enough that the AMD part will feel markedly slower in any OpenCL workload. However, the R7 M445 does have one structural advantage that the benchmark numbers do not capture: it carries 4 GB of GDDR5 memory compared to the Quadro’s 2 GB of DDR3. That does not show up as a win in the recorded tests, but for workloads that are memory-capacity bound rather than compute bound, the extra capacity could matter in practice.

The Quadro K620 also holds a significant advantage in raw throughput specifications that the database records. Its pixel rate is 17.98 GPixel/s versus the R7 M445’s 7.360 GPixel/s, and its texture rate is 26.98 GTexel/s versus 18.40 GTexel/s. The FP32 compute figure for the Quadro is 863.2 GFLOPS, while the AMD part manages 588.8 GFLOPS, a 46.6% advantage for the NVIDIA card. The AMD R7 M445 does match that FP32 number with its FP16 throughput, also 588.8 GFLOPS, but the Quadro’s FP16 figure is not recorded, so no direct comparison is possible there.

In terms of driver and API support, the Quadro K620 lists Vulkan 1.4 support, while the R7 M445 tops out at Vulkan 1.2.170, and the Quadro supports DirectX 12 (11_0) versus the R7 M445’s DirectX 12 (12_0). Both cards support OpenGL 4.6. The newer API feature level on the AMD side does not translate into a benchmark win in the recorded data, but it does mean the R7 M445 is technically more aligned with the latest DirectX 12 feature set.

The Verdict

The data points to a straightforward conclusion: if the workload is OpenCL compute, the NVIDIA Quadro K620 is the faster card by a decisive margin. Its 6693 score versus 5358 represents a 24.9% lead, and that is not a trivial edge in real-world terms. The Quadro K620 also wins on raw compute metrics like FP32 throughput, pixel fill, and texture fill, all of which are recorded in the database. For a professional environment where OpenCL is a regular part of the workflow, the Quadro K620 is the stronger choice.

The AMD Radeon R7 M445, however, is not without a case. It offers twice the memory capacity at 4 GB versus 2 GB, and that memory is GDDR5 rather than DDR3, giving it a higher memory bandwidth of 32.00 GB/s versus 28.80 GB/s. It also runs on a PCIe 3.0 x8 interface while the Quadro uses PCIe 2.0 x16, and it supports DirectX 12 (12_0) whereas the Quadro only reaches DirectX 12 (11_0). For a user who prioritizes memory capacity and newer API support over raw compute speed, the R7 M445 could be the more practical part in specific scenarios, such as holding larger textures or datasets in VRAM.

The nearest rival data reinforces the positioning. The Quadro K620’s average benchmark score of 6282 places it within 0.2% of the NVIDIA GeForce RTX 5070 Ti SUPER and the RTX 4070 Ti SUPER AD102, both of which score 6270, and it trails the AMD Radeon R7 M350 (6327) by 0.7% and the AMD Radeon Pro WX 4100 (6330) by 0.8%. That is remarkable company for a 2014-era workstation card. The R7 M445’s average score of 5358 puts it 0.2% behind the Intel UHD Graphics P630 (5370), 0.7% ahead of the NVIDIA GeForce 840M (5322), 0.8% ahead of the NVIDIA GeForce 930A (5317), and 0.9% ahead of the NVIDIA GeForce GTX 980M (5308). The GTX 980M comparison is particularly notable: the R7 M445 actually scores slightly higher than a card that is far more powerful in gaming contexts, which suggests the OpenCL workload favors the AMD part’s architecture in ways that gaming benchmarks would not.

The verdict for the buyer: pick the Quadro K620 for OpenCL compute performance and professional workload speed. Pick the R7 M445 if memory capacity, GDDR5 bandwidth, and a more modern DirectX feature level are the priorities, and if the 24.9% compute deficit is acceptable.

Head-to-Head Benchmarks

The only direct head-to-head benchmark recorded in the database is Geekbench OpenCL. The NVIDIA Quadro K620 scores 6693, and the AMD Radeon R7 M445 scores 5358. The delta is 24.9% in favor of the Quadro. That is a commanding lead, and it is consistent with the underlying specification differences between the two parts.

The Quadro K620’s compute advantage stems from its GM107 chip, a Maxwell architecture part with 384 shading units, 24 texture mapping units, and 16 ROPs. It runs at a base clock of 1058 MHz with a boost of 1124 MHz. The R7 M445 uses the Meso chip, a GCN 3.0 architecture part with 320 shading units, 20 TMUs, and 8 ROPs, at a base clock of 780 MHz and a boost of 920 MHz. The Quadro has more shading units and higher clocks, which explains the FP32 gap: 863.2 GFLOPS versus 588.8 GFLOPS.

The memory subsystem tells a different story. The Quadro K620 uses 2 GB of DDR3 on a 128-bit bus, yielding 28.80 GB/s of bandwidth. The R7 M445 uses 4 GB of GDDR5 on a 64-bit bus, yielding 32.00 GB/s. Despite the narrower bus, the faster GDDR5 memory gives the AMD part a 11.1% bandwidth advantage. That does not translate into a benchmark win, but it means the R7 M445 is not completely outclassed in memory-bound scenarios.

The pixel and texture rates also favor the Quadro. The Quadro K620’s 17.98 GPixel/s is more than double the R7 M445’s 7.360 GPixel/s, a 144% advantage. The texture rate of 26.98 GTexel/s versus 18.40 GTexel/s is a 46.6% lead for NVIDIA. These figures suggest the Quadro is better suited to fill-rate-intensive workloads, while the R7 M445’s higher memory bandwidth might help in situations where data movement is the bottleneck.

The API support difference is worth noting. The Quadro K620 supports Vulkan 1.4, while the R7 M445 supports Vulkan 1.2.170. The Quadro’s DirectX support is 12 (11_0), and the R7 M445’s is 12 (12_0). The newer DirectX feature level on the AMD card is a real difference, but it does not show up in the recorded OpenCL benchmark.

FAQ

Q: Which GPU has the higher OpenCL benchmark score?

A: The NVIDIA Quadro K620 scores 6693, which is 24.9% higher than the AMD Radeon R7 M445’s 5358.

Q: Does the AMD Radeon R7 M445 win any recorded benchmark against the Quadro K620?

A: No. The database records a single head-to-head benchmark, Geekbench OpenCL, and the Quadro K620 wins it. The R7 M445 has zero wins in the head-to-head comparison.

Q: Which card has more memory and what type?

A: The AMD Radeon R7 M445 has 4 GB of GDDR5 memory on a 64-bit bus. The NVIDIA Quadro K620 has 2 GB of DDR3 memory on a 128-bit bus.

Q: How does the memory bandwidth compare?

A: The R7 M445 has 32.00 GB/s of bandwidth, while the Quadro K620 has 28.80 GB/s. The AMD card has a 11.1% bandwidth advantage.

Q: Which card supports a newer DirectX version?

A: The AMD Radeon R7 M445 supports DirectX 12 (12_0), while the NVIDIA Quadro K620 supports DirectX 12 (11_0). The AMD card has the newer feature level.

Q: How do these cards compare to their nearest rivals in the database?

A: The Quadro K620’s average score of 6282 is within 0.2% of the RTX 5070 Ti SUPER and RTX 4070 Ti SUPER AD102, and within 0.8% of the AMD Radeon Pro WX 4100. The R7 M445’s average score of 5358 is 0.2% behind the Intel UHD Graphics P630 and 0.9% ahead of the NVIDIA GeForce GTX 980M.

Architecture Differences

The NVIDIA Quadro K620 and AMD Radeon R7 M445 are built on fundamentally different architectures, and the database records those differences in detail.

The Quadro K620 uses the GM107 chip, based on NVIDIA’s Maxwell architecture. It is fabricated on a 28 nm process at TSMC, with 1,870 million transistors on a 148 mm² die, giving a transistor density of 12.6 million per mm². The R7 M445 uses the Meso chip, based on AMD’s GCN 3.0 architecture, also on a 28 nm process at TSMC, with 1,550 million transistors on a 125 mm² die, a density of 12.4 million per mm². The Quadro has a slightly higher transistor count and density, and a larger die.

The generation labels differ as well. The Quadro K620 is listed under the “Quadro Kepler (Kx200)” generation, despite using a Maxwell chip, while the R7 M445 is under the “Gem System (R7 M400)” generation. The Quadro’s predecessor is “Quadro Fermi” and its successor is “Quadro Maxwell,” while the R7 M445’s predecessor is “Solar System” and its successor is “Polaris Mobile.”

Clock speeds show a clear NVIDIA advantage. The Quadro K620 runs at a base of 1058 MHz and boosts to 1124 MHz. The R7 M445 runs at a base of 780 MHz and boosts to 920 MHz. The Quadro also has more execution resources: 384 shading units, 24 TMUs, and 16 ROPs, versus 320 shading units, 20 TMUs, and 8 ROPs on the AMD part.

The memory architectures differ substantially. The Quadro K620 uses 2 GB of DDR3 on a 128-bit bus, with memory clocked at 900 MHz and 1800 Mbps effective. The R7 M445 uses 4 GB of GDDR5 on a 64-bit bus, with memory clocked at 1000 MHz and 4 Gbps effective. The AMD part has higher bandwidth despite the narrower bus. The Quadro’s pixel rate is 17.98 GPixel/s, and its texture rate is 26.98 GTexel/s. The R7 M445’s pixel rate is 7.360 GPixel/s, and its texture rate is 18.40 GTexel/s.

Power and physical specs also diverge. The Quadro K620 has a TDP of 45 W, is a single-slot card, requires no power connectors, and suggests a 200 W PSU. It is 160 mm long and 69 mm high, and uses a PCIe 2.0 x16 interface. The R7 M445 has no recorded TDP, is an IGP (integrated graphics processor), has no power connector data, and uses a PCIe 3.0 x8 interface. Its display outputs are listed as “Portable Device Dependent,” reflecting its mobile-oriented design. The Quadro has 1x DVI and 1x DisplayPort 1.2 outputs.

API support differs on the compute side. The Quadro K620 lists DirectX 12 (11_0), OpenGL 4.6, and Vulkan 1.4. The R7 M445 lists DirectX 12 (12_0), OpenGL 4.6, and Vulkan 1.2.170. The AMD card has the newer DirectX feature level, while the NVIDIA card has the newer Vulkan version. The Quadro’s FP32 throughput is 863.2 GFLOPS, and the R7 M445’s is 588.8 GFLOPS. The R7 M445 also records FP16 at 588.8 GFLOPS (1:1), while the Quadro’s FP16 figure is not recorded.

Release dates show the generational gap. The Quadro K620 launched on 2014-07-21, while the R7 M445 launched on 2016-05-14. Both are marked end-of-life in the database. The Quadro sits in the 36th percentile of all GPUs, and the R7 M445 in the 31st.