Radeon 660M vs RX 550X 640SP
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | not rated | 329 |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | no data | 28.39 |
| Architecture | GCN 4.0 (2016−2020) | RDNA 2.0 (2020−2024) |
| GPU code name | Baffin | Rembrandt+ |
| Market segment | Desktop | Laptop |
| Release date | 11 April 2018 (6 years ago) | 3 January 2023 (1 year ago) |
Detailed specifications
General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.
| Pipelines / CUDA cores | 640 | 384 |
| Core clock speed | 1019 MHz | 1500 MHz |
| Boost clock speed | 1071 MHz | 1900 MHz |
| Number of transistors | 3,000 million | 13,100 million |
| Manufacturing process technology | 14 nm | 6 nm |
| Power consumption (TDP) | 60 Watt | 40 Watt |
| Texture fill rate | 42.84 | 45.60 |
| Floating-point processing power | 1.371 TFLOPS | 1.459 TFLOPS |
| ROPs | 16 | 16 |
| TMUs | 40 | 24 |
| Ray Tracing Cores | no data | 6 |
Form factor & compatibility
Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).
| Interface | PCIe 3.0 x8 | PCIe 4.0 x8 |
| Length | 145 mm | no data |
| Width | 2-slot | no data |
| Supplementary power connectors | None | None |
VRAM capacity and type
Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.
| Memory type | GDDR5 | System Shared |
| Maximum RAM amount | 2 GB | System Shared |
| Memory bus width | 128 Bit | System Shared |
| Memory clock speed | 1500 MHz | System Shared |
| Memory bandwidth | 96 GB/s | no data |
| Shared memory | - | + |
Connectivity and outputs
Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.
| Display Connectors | 1x DVI, 1x HDMI, 1x DisplayPort | Portable Device Dependent |
| HDMI | + | - |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (12_0) | 12 Ultimate (12_2) |
| Shader Model | 6.4 | 6.7 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.0 | 2.0 |
| Vulkan | 1.2.131 | 1.3 |
Pros & cons summary
| Recency | 11 April 2018 | 3 January 2023 |
| Chip lithography | 14 nm | 6 nm |
| Power consumption (TDP) | 60 Watt | 40 Watt |
Radeon 660M has an age advantage of 4 years, a 133.3% more advanced lithography process, and 50% lower power consumption.
We couldn't decide between Radeon RX 550X 640SP and Radeon 660M. We've got no test results to judge.
Be aware that Radeon RX 550X 640SP is a desktop card while Radeon 660M is a notebook one.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
Comparisons with similar GPUs
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