GeForce GTX 660 Rev. 2 vs 840A
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 849 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 6.19 | no data |
| Architecture | Maxwell (2014−2017) | Kepler (2012−2018) |
| GPU code name | GM108 | GK104 |
| Market segment | Laptop | Desktop |
| Release date | 17 March 2014 (11 years ago) | 13 September 2014 (11 years 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 | 384 | 960 |
| Core clock speed | 1029 MHz | 980 MHz |
| Boost clock speed | 1124 MHz | 1032 MHz |
| Number of transistors | no data | 3,540 million |
| Manufacturing process technology | 28 nm | 28 nm |
| Power consumption (TDP) | 33 Watt | 140 Watt |
| Texture fill rate | 17.98 | 82.56 |
| Floating-point processing power | 0.8632 TFLOPS | 1.981 TFLOPS |
| ROPs | 8 | 24 |
| TMUs | 16 | 80 |
| L1 Cache | 192 KB | 80 KB |
| L2 Cache | 1024 KB | 384 KB |
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 3.0 x16 |
| Length | no data | 241 mm |
| Width | no data | 2-slot |
| Supplementary power connectors | no data | 1x 6-pin |
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 | DDR3 | GDDR5 |
| Maximum RAM amount | 2 GB | 2 GB |
| Memory bus width | 64 Bit | 192 Bit |
| Memory clock speed | 1001 MHz | 1502 MHz |
| Memory bandwidth | 16.02 GB/s | 144.2 GB/s |
Connectivity and outputs
This section shows the types and number of video connectors on each GPU. The data applies specifically to desktop reference models (for example, NVIDIA’s Founders Edition). OEM partners often modify both the number and types of ports. On notebook GPUs, video‐output options are determined by the laptop’s design rather than the graphics chip itself.
| Display Connectors | No outputs | 2x DVI, 1x HDMI, 1x DisplayPort |
| HDMI | - | + |
API and SDK support
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_0) | 12 (11_0) |
| Shader Model | 5.1 | 5.1 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | 1.1.126 | 1.1.126 |
| CUDA | 5.0 | 3.0 |
Pros & cons summary
| Recency | 17 March 2014 | 13 September 2014 |
| Power consumption (TDP) | 33 Watt | 140 Watt |
GeForce 840A has 324.2% lower power consumption.
GTX 660 Rev. 2, on the other hand, has an age advantage of 5 months.
We couldn't decide between GeForce 840A and GeForce GTX 660 Rev. 2. We've got no test results to judge.
Be aware that GeForce 840A is a notebook graphics card while GeForce GTX 660 Rev. 2 is a desktop one.
Other comparisons
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
