AMD Radeon RX 6600S vs NVIDIA GeForce GTX 950A Comparison

Head-to-Head Benchmarks

The only directly comparable benchmark in the data is Geekbench OpenCL, and the result is decisive. The AMD Radeon RX 6600S scores 66,435, while the NVIDIA GeForce GTX 950A scores 10,273. That is a delta of 546.7% in favor of the AMD part — the RX 6600S delivers over six and a half times the raw compute throughput of the GTX 950A in this workload. No other head-to-head test was recorded, so this single data point carries the full weight of the comparison.

Looking at aggregate performance, the RX 6600S holds an average benchmark score of 10,629 across all recorded tests, while the GTX 950A averages 10,273. The RX 6600S sits at the 49th percentile of all GPUs, and the GTX 950A sits at the 48th percentile — essentially adjacent in the overall distribution. Yet the OpenCL gap reveals how misleading percentiles can be when one card has far fewer recorded benchmarks. The GTX 950A's average is based solely on its OpenCL score, while the RX 6600S's average is pulled down by several low-scoring legacy DirectX tests.

The RX 6600S's individual benchmark results show a wide spread: 12,649 in Passmark G3D, 4,879 in GPU compute, 647 in G2D, 176 in DirectX 9, 105 in DirectX 11, 81 in DirectX 10, and 56 in DirectX 12. The GTX 950A has no comparable sub-scores in the data, so cross-referencing per-API performance is not possible. What the data does show is that the RX 6600S is dramatically faster in modern compute-heavy workloads, while its legacy DirectX scores are surprisingly low — likely reflecting driver overhead or test methodology rather than raw capability.

Where Each One Wins

The RX 6600S wins the only direct head-to-head matchup, and it wins by an enormous margin. In Geekbench OpenCL, its 66,435 score against 10,273 means that any workload leveraging OpenCL — which includes many compute tasks, physics simulations, and certain rendering pipelines — will favor the AMD card overwhelmingly. The RX 6600S also holds a higher average benchmark score (10,629 vs 10,273), a 3.5% advantage overall, despite the GTX 950A having only one recorded benchmark.

The GTX 950A's wins are less about performance and more about context. It draws within 2% of the AMD Radeon RX 550X (average score 10,481) and beats the AMD Radeon R9 M375 by 2% (10,070) according to its nearest rival data. It also trails the AMD Radeon RX 6500M by only 0.9% and the NVIDIA Tesla C2075 by 1.2%. Meanwhile, the RX 6600S's nearest rivals include the NVIDIA GeForce GTX 560 Ti (0.6% behind), the NVIDIA Quadro K2200 (1.2% behind), and the AMD Radeon R9 M275X (0.4% ahead). The picture is that both cards sit in a tight cluster of mid-range mobile GPUs when averaged across all tests, but the RX 6600S's OpenCL dominance separates it in compute-heavy scenarios.

For gaming, the RX 6600S's Passmark G3D score of 12,649 suggests strong DirectX 11-era rasterization performance. The GTX 950A has no equivalent score in the data, so any gaming comparison must rely on the OpenCL result as a proxy — and that proxy is overwhelmingly in AMD's favor. For professional compute, the RX 6600S's 4,879 GPU compute score further reinforces its advantage.

Architecture Differences

The two GPUs come from different architectural generations and process nodes. The AMD Radeon RX 6600S uses the Navi 23 chip on RDNA 2.0 architecture, fabricated on TSMC's 7 nm process. It packs 11,060 million transistors into a 237 mm² die, yielding a transistor density of 46.7 million per mm². The NVIDIA GeForce GTX 950A uses the GM107 chip on Maxwell architecture, built on TSMC's 28 nm process, with 1,870 million transistors on a 148 mm² die — a density of 12.6 million per mm². The RX 6600S has nearly six times the transistor count on a die that is only 60% larger.

Clock speeds reflect the architectural gap. The RX 6600S runs at a 1700 MHz base and 2000 MHz boost, with a 1881 MHz game clock. The GTX 950A runs at 993 MHz base and 1124 MHz boost. Memory clocks differ similarly: 1750 MHz (14 Gbps effective) for the AMD card versus 1001 MHz (2 Gbps effective) for the NVIDIA card. The memory subsystem is where the gap becomes stark — the RX 6600S has 4 GB of GDDR6 on a 128-bit bus delivering 224.0 GB/s bandwidth, while the GTX 950A has 2 GB of DDR3 on a 128-bit bus delivering just 32.03 GB/s. That is a seven-fold bandwidth advantage for AMD.

The RX 6600S has 1,792 shading units, 112 texture mapping units, and 64 raster output pipelines. It also features 28 ray tracing cores. The GTX 950A has 640 shading units, 40 TMUs, and 16 ROPs, with no ray tracing cores. Pixel rate is 128.0 GPixel/s for the RX 6600S versus 17.98 GPixel/s for the GTX 950A. Texture rate is 224.0 GTexel/s versus 44.96 GTexel/s. FP32 compute is 7.168 TFLOPS for the AMD card versus 1,438.7 GFLOPS for the NVIDIA card — a five-fold difference. The RX 6600S also supports FP16 at 14.34 TFLOPS (2:1 ratio), a feature the GTX 950A lacks entirely.

API support diverges as well. The RX 6600S supports DirectX 12 Ultimate (12_2), while the GTX 950A is limited to DirectX 12 (11_0). Both support OpenGL 4.6 and Vulkan 1.4. The RX 6600S uses a PCIe 4.0 x8 bus interface, while the GTX 950A uses an MXM-B (3.0) interface. Power draw is comparable — 80 W for the AMD card, 75 W for the NVIDIA card — and neither requires external power connectors. The RX 6600S is an IGP (integrated graphics processor) form factor, while the GTX 950A is an MXM module. Both are end-of-life products; the RX 6600S released in January 2022, the GTX 950A in March 2015.

The Verdict

The data is unambiguous: the AMD Radeon RX 6600S is the superior GPU in every measurable performance category. Its OpenCL score is 546.7% higher, its memory bandwidth is 224.0 GB/s versus 32.03 GB/s, its FP32 compute is 7.168 TFLOPS versus 1,438.7 GFLOPS, and it has 4 GB of memory versus 2 GB. The RX 6600S also has 28 ray tracing cores to the GTX 950A's none, and supports DirectX 12 Ultimate compared to the GTX 950A's DirectX 12 (11_0).

The GTX 950A's only redeeming quality in this comparison is its lower transistor count (1,870 million vs 11,060 million) and smaller die (148 mm² vs 237 mm²), which speak to its older, simpler design — not to any performance advantage. Its nearest rival data shows it competing with cards like the RX 550X (2% behind) and R9 M375 (2% ahead), placing it in the same approximate tier as the RX 6600S's rivals, but the OpenCL head-to-head destroys that parity.

Who should pick which? From the data, anyone needing modern compute performance, ray tracing capability, or high-bandwidth memory should choose the RX 6600S. The GTX 950A might be acceptable for legacy workloads that predate its 2015 release, but even then, its 2 GB DDR3 memory and 32.03 GB/s bandwidth are severe constraints. The RX 6600S's 49th percentile ranking versus the GTX 950A's 48th percentile understates the gap because the GTX 950A's average is based on a single benchmark. When that benchmark is compared directly, the RX 6600S wins by a factor of 6.5.

FAQ

Q: How much faster is the AMD Radeon RX 6600S than the NVIDIA GeForce GTX 950A in Geekbench OpenCL?

A: The RX 6600S scores 66,435 versus 10,273 for the GTX 950A, a delta of 546.7% in favor of the AMD card.

Q: Which GPU has more memory bandwidth?

A: The AMD Radeon RX 6600S has 224.0 GB/s bandwidth from 4 GB of GDDR6 on a 128-bit bus, while the NVIDIA GeForce GTX 950A has 32.03 GB/s from 2 GB of DDR3 on a 128-bit bus.

Q: Do both GPUs support ray tracing?

A: No. The AMD Radeon RX 6600S has 28 ray tracing cores, while the NVIDIA GeForce GTX 950A has none.

Q: What are the process nodes for each GPU?

A: The RX 6600S is fabricated on TSMC's 7 nm process, while the GTX 950A uses TSMC's 28 nm process.

Q: Which GPU has a higher average benchmark score?

A: The RX 6600S averages 10,629 across all recorded benchmarks, while the GTX 950A averages 10,273 — a 3.5% advantage for AMD.

Q: What is the power consumption difference?

A: The RX 6600S has a TDP of 80 W, and the GTX 950A has a TDP of 75 W — a 5 W difference in favor of NVIDIA.

Specification Differences

| Specification | AMD Radeon RX 6600S | NVIDIA GeForce GTX 950A |

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

| Chip | Navi 23 | GM107 |

| Architecture | RDNA 2.0 | Maxwell |

| Process Node | 7 nm | 28 nm |

| Transistors | 11,060 million | 1,870 million |

| Die Size | 237 mm² | 148 mm² |

| Transistor Density | 46.7M / mm² | 12.6M / mm² |

| Base Clock | 1700 MHz | 993 MHz |

| Boost Clock | 2000 MHz | 1124 MHz |

| Game Clock | 1881 MHz | — |

| Memory Clock | 1750 MHz (14 Gbps effective) | 1001 MHz (2 Gbps effective) |

| Memory Size | 4 GB | 2 GB |

| Memory Type | GDDR6 | DDR3 |

| Memory Bus Width | 128 bit | 128 bit |

| Memory Bandwidth | 224.0 GB/s | 32.03 GB/s |

| Shading Units | 1792 | 640 |

| TMUs | 112 | 40 |

| ROPs | 64 | 16 |

| RT Cores | 28 | — |

| Pixel Rate | 128.0 GPixel/s | 17.98 GPixel/s |

| Texture Rate | 224.0 GTexel/s | 44.96 GTexel/s |

| FP32 Performance | 7.168 TFLOPS | 1,438.7 GFLOPS |

| FP16 Performance | 14.34 TFLOPS (2:1) | — |

| TDP | 80 W | 75 W |

| Slot Width | IGP | MXM Module |

| Power Connectors | None | None |

| Bus Interface | PCIe 4.0 x8 | MXM-B (3.0) |

| DirectX Support | 12 Ultimate (12_2) | 12 (11_0) |

| Release Date | 2022-01-03 | 2015-03-12 |

| Production Status | End-of-life | End-of-life |