GeForce GT 645 OEM vs GTX 660M
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 700 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 5.20 | no data |
| Architecture | Kepler (2012−2018) | Fermi 2.0 (2010−2014) |
| GPU code name | GK107 | GF114 |
| Market segment | Laptop | Desktop |
| Release date | 22 March 2012 (12 years ago) | 24 April 2012 (12 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 | 288 |
| Core clock speed | 835 MHz | 776 MHz |
| Boost clock speed | 950 MHz | no data |
| Number of transistors | 1,270 million | 1,950 million |
| Manufacturing process technology | 28 nm | 40 nm |
| Power consumption (TDP) | 50 Watt | 102 Watt |
| Texture fill rate | 30.40 | 37.25 |
| Floating-point processing power | 0.7296 TFLOPS | 0.894 TFLOPS |
| ROPs | 16 | 24 |
| TMUs | 32 | 48 |
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).
| Laptop size | large | no data |
| Bus support | PCI Express 2.0, PCI Express 3.0 | no data |
| Interface | MXM-B (3.0) | PCIe 2.0 x16 |
| Length | no data | 210 mm |
| Width | no data | 2-slot |
| SLI options | + | - |
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 | 1 GB | 1 GB |
| Memory bus width | 128bit | 192 Bit |
| Memory clock speed | 2000 MHz | 957 MHz |
| Memory bandwidth | 64.0 GB/s | 91.87 GB/s |
| 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 | No outputs | 2x DVI, 1x mini-HDMI |
| HDMI | + | + |
| HDCP | + | - |
| Maximum VGA resolution | Up to 2048x1536 | no data |
Supported technologies
Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.
| Optimus | + | - |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 API | 12 (11_0) |
| Shader Model | 5.1 | 5.1 |
| OpenGL | 4.5 | 4.6 |
| OpenCL | 1.1 | 1.1 |
| Vulkan | 1.1.126 | N/A |
| CUDA | + | 2.1 |
Pros & cons summary
| Recency | 22 March 2012 | 24 April 2012 |
| Chip lithography | 28 nm | 40 nm |
| Power consumption (TDP) | 50 Watt | 102 Watt |
GTX 660M has a 42.9% more advanced lithography process, and 104% lower power consumption.
GT 645 OEM, on the other hand, has an age advantage of 1 month.
We couldn't decide between GeForce GTX 660M and GeForce GT 645 OEM. We've got no test results to judge.
Be aware that GeForce GTX 660M is a notebook card while GeForce GT 645 OEM is a desktop 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
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
