Iris Plus Graphics 645 vs GeForce GTX 660 Rev. 2
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | not rated | 665 |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | no data | 20.34 |
| Architecture | Kepler (2012−2018) | Generation 9.5 (2016−2020) |
| GPU code name | GK104 | Coffee Lake GT3e |
| Market segment | Desktop | Laptop |
| Release date | 13 September 2014 (10 years ago) | 7 October 2019 (5 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 | 960 | 384 |
| Core clock speed | 980 MHz | 300 MHz |
| Boost clock speed | 1032 MHz | 1050 MHz |
| Number of transistors | 3,540 million | no data |
| Manufacturing process technology | 28 nm | 14 nm+++ |
| Power consumption (TDP) | 140 Watt | 15 Watt |
| Texture fill rate | 82.56 | 50.40 |
| Floating-point processing power | 1.981 TFLOPS | 0.8064 TFLOPS |
| ROPs | 24 | 6 |
| TMUs | 80 | 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).
| Interface | PCIe 3.0 x16 | Ring Bus |
| Length | 241 mm | no data |
| Width | 2-slot | no data |
| Supplementary power connectors | 1x 6-pin | no data |
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 | 192 Bit | System Shared |
| Memory clock speed | 1502 MHz | System Shared |
| Memory bandwidth | 144.2 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 | 2x DVI, 1x HDMI, 1x DisplayPort | Portable Device Dependent |
| HDMI | + | - |
Supported technologies
Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.
| Quick Sync | no data | + |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_0) | 12 (12_1) |
| Shader Model | 5.1 | 6.4 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 3.0 |
| Vulkan | 1.1.126 | 1.3 |
| CUDA | 3.0 | - |
Pros & cons summary
| Recency | 13 September 2014 | 7 October 2019 |
| Chip lithography | 28 nm | 14 nm |
| Power consumption (TDP) | 140 Watt | 15 Watt |
Iris Plus Graphics 645 has an age advantage of 5 years, a 100% more advanced lithography process, and 833.3% lower power consumption.
We couldn't decide between GeForce GTX 660 Rev. 2 and Iris Plus Graphics 645. We've got no test results to judge.
Be aware that GeForce GTX 660 Rev. 2 is a desktop card while Iris Plus Graphics 645 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
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
