GeForce GTX 660M Mac Edition vs Radeon R9 390 X2
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | not rated | 964 |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | no data | 2.16 |
| Architecture | GCN 2.0 (2013−2017) | Kepler (2012−2018) |
| GPU code name | Grenada | GK107 |
| Market segment | Desktop | Laptop |
| Release date | 3 September 2015 (9 years ago) | 1 April 2013 (11 years ago) |
| Launch price (MSRP) | $1,399 | no data |
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 | 2560 | 384 |
| Core clock speed | 1000 MHz | 950 MHz |
| Number of transistors | 6,200 million | 1,270 million |
| Manufacturing process technology | 28 nm | 28 nm |
| Power consumption (TDP) | 580 Watt | 50 Watt |
| Texture fill rate | 160.0 | 30.40 |
| Floating-point processing power | 5.12 TFLOPS | 0.7296 TFLOPS |
| ROPs | 64 | 16 |
| TMUs | 160 | 32 |
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 x16 | MXM-B (3.0) |
| Width | 3-slot | no data |
| Supplementary power connectors | 4x 8-pin | 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 | GDDR5 |
| Maximum RAM amount | 8 GB | 512 MB |
| Memory bus width | 512 Bit | 128 Bit |
| Memory clock speed | 1350 MHz | 1250 MHz |
| Memory bandwidth | 345.6 GB/s | 80 GB/s |
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 | 2x DVI, 1x HDMI, 1x DisplayPort | No outputs |
| HDMI | + | - |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (12_0) | 12 (11_0) |
| Shader Model | 6.3 | 5.1 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 2.0 | 1.2 |
| Vulkan | 1.2.131 | 1.1.126 |
| CUDA | - | 3.0 |
Pros & cons summary
| Recency | 3 September 2015 | 1 April 2013 |
| Maximum RAM amount | 8 GB | 512 MB |
| Power consumption (TDP) | 580 Watt | 50 Watt |
R9 390 X2 has an age advantage of 2 years, and a 1500% higher maximum VRAM amount.
GTX 660M Mac Edition, on the other hand, has 1060% lower power consumption.
We couldn't decide between Radeon R9 390 X2 and GeForce GTX 660M Mac Edition. We've got no test results to judge.
Be aware that Radeon R9 390 X2 is a desktop card while GeForce GTX 660M Mac Edition 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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