AMD Radeon HD 8750M vs AMD Radeon R7 M445 Comparison

FAQ

Q: Which GPU has the higher Geekbench OpenCL score?

A: The AMD Radeon HD 8750M scores 5970, while the AMD Radeon R7 M445 scores 5358. The HD 8750M leads by 11.4% in this benchmark.

Q: How does the HD 8750M compare to its closest rivals?

A: The HD 8750M sits within 0.3% of three nearby competitors. It is 0.2% behind the NVIDIA Quadro K4000 (5982), 0.2% ahead of the NVIDIA Quadro K620M (5957), and 0.3% ahead of the AMD Radeon HD 8730M (5955).

Q: What is the R7 M445's position among its nearest rivals?

A: The R7 M445 scores 5358, which places 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).

Q: What memory configurations do these two GPUs use?

A: The HD 8750M has 1024 MB of DDR3 memory on a 128-bit bus with 28.80 GB/s bandwidth. The R7 M445 has 4 GB of GDDR5 memory on a 64-bit bus with 32.00 GB/s bandwidth.

Q: Which GPU has more shading units?

A: The HD 8750M has 384 shading units, while the R7 M445 has 320 shading units. The HD 8750M also has 24 texture mapping units versus 20 on the R7 M445.

Q: What are the architectural generations of each GPU?

A: The HD 8750M uses GCN 1.0 architecture on the Mars chip, while the R7 M445 uses GCN 3.0 architecture on the Meso chip. Both are built on TSMC's 28 nm process.

Architecture Differences

The two GPUs come from different architectural families despite sharing the same manufacturer and process node. The AMD Radeon HD 8750M uses GCN 1.0 architecture built on the Mars chip. The AMD Radeon R7 M445 uses GCN 3.0 architecture built on the Meso chip. Both are fabricated by TSMC on a 28 nm process, but the underlying designs differ substantially.

The HD 8750M belongs to the Solar System generation, specifically the HD 8700M family, with the London chip as its predecessor and Gem System as its successor. The R7 M445 belongs to the Gem System generation, the R7 M400 family, with Solar System as its predecessor and Polaris Mobile as its successor. This places the R7 M445 one full generation ahead of the HD 8750M in AMD's mobile lineup.

Transistor counts reveal a significant difference in complexity. The HD 8750M packs 950 million transistors on a 77 mm² die, while the R7 M445 contains 1,550 million transistors on a 125 mm² die. Transistor density is nearly identical at 12.3M per mm² for the HD 8750M and 12.4M per mm² for the R7 M445, indicating that the larger die on the R7 M445 comes from adding more hardware rather than shrinking features.

The compute configurations differ in scale. The HD 8750M has 384 shading units, 24 texture mapping units, and 8 ROPs. The R7 M445 has 320 shading units, 20 texture mapping units, and also 8 ROPs. Despite having fewer cores, the R7 M445 achieves higher clock speeds, which partially compensates for its reduced core count.

The memory subsystems take different approaches. The HD 8750M uses 1024 MB of DDR3 on a 128-bit bus, while the R7 M445 uses 4 GB of GDDR5 on a 64-bit bus. The HD 8750M's memory runs at 900 MHz with 1800 Mbps effective, while the R7 M445's memory runs at 1000 MHz with 4 Gbps effective. These differences produce bandwidth figures of 28.80 GB/s for the HD 8750M and 32.00 GB/s for the R7 M445.

API support shows the R7 M445's newer generation. The HD 8750M supports DirectX 12 (11_1), while the R7 M445 supports DirectX 12 (12_0). Both support OpenGL 4.6 and Vulkan 1.2.170. The R7 M445 also has a different form factor classification, listed as IGP, while the HD 8750M has no slot width listed.

Head-to-Head Benchmarks

The only recorded head-to-head benchmark is Geekbench OpenCL, and the results favor the older GPU. The AMD Radeon HD 8750M scores 5970 against the AMD Radeon R7 M445's 5358, producing a delta of 11.4% in favor of the HD 8750M. This is a decisive win for the GCN 1.0 part.

The HD 8750M's advantage comes despite the R7 M445's higher clock speeds. The R7 M445 runs at 780 MHz base and 920 MHz boost, while the HD 8750M runs at 775 MHz base and 825 MHz boost. The R7 M445's boost clock is 95 MHz higher, yet it still trails in the benchmark by a wide margin. The HD 8750M's larger core count, 384 shading units versus 320, appears to be the decisive factor.

Pixel rate and texture rate tell a mixed story. The R7 M445 has a higher pixel rate at 7.360 GPixel/s versus 6.600 GPixel/s for the HD 8750M, a difference driven by its higher boost clock. However, the HD 8750M has a higher texture rate at 19.80 GTexel/s versus 18.40 GTexel/s, because its 24 TMUs outnumber the R7 M445's 20 TMUs despite the clock deficit.

Raw floating-point performance follows the shading unit count. The HD 8750M delivers 633.6 GFLOPS of FP32 compute, while the R7 M445 delivers 588.8 GFLOPS. The R7 M445 also lists FP16 performance at 588.8 GFLOPS with a 1:1 ratio to FP32, while the HD 8750M has no recorded FP16 figure.

The percentile rankings reflect the benchmark gap. The HD 8750M sits at the 34th percentile among all GPUs, while the R7 M445 sits at the 31st percentile. The three-point percentile gap is modest but consistent with the 11.4% benchmark delta.

Specification Differences

| Specification | AMD Radeon HD 8750M | AMD Radeon R7 M445 |

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

| Architecture | GCN 1.0 | GCN 3.0 |

| Chip | Mars | Meso |

| Generation | Solar System (HD 8700M) | Gem System (R7 M400) |

| Transistors | 950 million | 1,550 million |

| Die size | 77 mm² | 125 mm² |

| Base clock | 775 MHz | 780 MHz |

| Boost clock | 825 MHz | 920 MHz |

| Memory clock | 900 MHz (1800 Mbps effective) | 1000 MHz (4 Gbps effective) |

| Memory size | 1024 MB | 4 GB |

| Memory type | DDR3 | GDDR5 |

| Memory bus width | 128 bit | 64 bit |

| Memory bandwidth | 28.80 GB/s | 32.00 GB/s |

| Shading units | 384 | 320 |

| TMUs | 24 | 20 |

| Pixel rate | 6.600 GPixel/s | 7.360 GPixel/s |

| Texture rate | 19.80 GTexel/s | 18.40 GTexel/s |

| FP32 performance | 633.6 GFLOPS | 588.8 GFLOPS |

| FP16 performance | Not recorded | 588.8 GFLOPS (1:1) |

| DirectX support | 12 (11_1) | 12 (12_0) |

| Display outputs | Not recorded | Portable Device Dependent |

| Slot width | Not recorded | IGP |

| Release date | 2013-02-25 | 2016-05-14 |

| Predecessor | London | Solar System |

| Successor | Gem System | Polaris Mobile |

Where Each One Wins

The AMD Radeon HD 8750M wins in raw compute throughput. Its 384 shading units deliver 633.6 GFLOPS of FP32 performance, beating the R7 M445's 588.8 GFLOPS. The texture rate also favors the HD 8750M at 19.80 GTexel/s versus 18.40 GTexel/s. In the Geekbench OpenCL test, the HD 8750M leads by 11.4%, and it occupies a higher percentile ranking at 34 versus 31. This makes the HD 8750M the better choice for compute-oriented workloads that are sensitive to shading unit count and texture throughput.

The R7 M445 wins in memory capacity and bandwidth efficiency. It offers 4 GB of GDDR5 memory versus 1024 MB of DDR3, and its 32.00 GB/s bandwidth exceeds the HD 8750M's 28.80 GB/s despite using a 64-bit bus. The R7 M445 also has a higher pixel rate at 7.360 GPixel/s versus 6.600 GPixel/s, meaning it can fill framebuffers faster. Its newer GCN 3.0 architecture supports DirectX 12 (12_0) compared to the HD 8750M's DirectX 12 (11_1), which may matter for applications that require newer feature levels. The R7 M445 also has a higher boost clock at 920 MHz versus 825 MHz, and it lists FP16 support at 588.8 GFLOPS, which the HD 8750M does not record.

The HD 8750M also wins on transistor efficiency relative to benchmark output, though the data does not support a direct efficiency calculation. The R7 M445 has 63% more transistors and a 62% larger die, yet it scores 10.2% lower in the recorded benchmark. The HD 8750M's smaller, simpler design achieves a higher score with far less hardware.

The Verdict

The data points to the AMD Radeon HD 8750M as the stronger performer in the recorded benchmark. It wins the only head-to-head test by 11.4%, holds a higher percentile ranking, and delivers more FP32 compute and texture throughput. Users who prioritize raw compute results and OpenCL performance should choose the HD 8750M based on these measurements.

The AMD Radeon R7 M445 is the better option for scenarios that depend on memory capacity and newer API features. Its 4 GB GDDR5 frame buffer is four times larger, its memory bandwidth is 11.1% higher, and its pixel rate is 11.5% faster. The DirectX 12 (12_0) support and FP16 capability also give it a feature-level advantage that could be relevant for specific workloads.

The release timeline reinforces the generational split. The HD 8750M launched in 2013, while the R7 M445 launched in 2016. The newer part brings architectural improvements in GCN 3.0, but the benchmark results show that the older GPU's larger core configuration still wins in compute performance. Both GPUs are end-of-life products, so availability and driver support should be considered alongside these recorded measurements.

For compute-heavy tasks where OpenCL performance matters most, the HD 8750M is the clear choice from the data. For applications that need large memory allocations, faster pixel fill, or newer DirectX feature levels, the R7 M445 has the advantage. The benchmark database records one win for the HD 8750M and zero for the R7 M445, which aligns with the overall score difference.