GeForce GT 640 Rev. 2 vs GTX 660
Aggregate performance score
We've compared GeForce GTX 660 and GeForce GT 640 Rev. 2, covering specs and all relevant benchmarks.
GTX 660 outperforms GT 640 Rev. 2 by a whopping 192% based on our aggregate benchmark results.
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 434 | 717 |
| Place by popularity | 58 | not in top-100 |
| Cost-effectiveness evaluation | 3.27 | 0.19 |
| Power efficiency | 5.12 | 5.02 |
| Architecture | Kepler (2012−2018) | Kepler 2.0 (2013−2015) |
| GPU code name | GK106 | GK208 |
| Market segment | Desktop | Desktop |
| Release date | 6 September 2012 (12 years ago) | 29 May 2013 (11 years ago) |
| Launch price (MSRP) | $229 | $89 |
Cost-effectiveness evaluation
Performance to price ratio. The higher, the better.
GTX 660 has 1621% better value for money than GT 640 Rev. 2.
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 | 1046 MHz |
| Boost clock speed | 1033 MHz | no data |
| Number of transistors | 2,540 million | 915 million |
| Manufacturing process technology | 28 nm | 28 nm |
| Power consumption (TDP) | 140 Watt | 49 Watt |
| Texture fill rate | 82.56 | 33.47 |
| Floating-point processing power | 1.981 TFLOPS | 0.8033 TFLOPS |
| ROPs | 24 | 8 |
| TMUs | 80 | 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).
| Bus support | PCI Express 3.0 | no data |
| Interface | PCIe 3.0 x16 | PCIe 2.0 x8 |
| Length | 241 mm | 145 mm |
| Height | 4.376" (11.1 cm) | no data |
| Width | 2-slot | 1-slot |
| Supplementary power connectors | 1x 6-pin | None |
| 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 | 2 GB | 1 GB |
| Memory bus width | 192-bit GDDR5 | 64 Bit |
| Memory clock speed | 6.0 GB/s | 1252 MHz |
| Memory bandwidth | 144.2 GB/s | 40.06 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 | One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort | 1x DVI, 1x HDMI, 1x VGA |
| Multi monitor support | 4 displays | no data |
| HDMI | + | + |
| HDCP | + | - |
| Maximum VGA resolution | 2048x1536 | no data |
| Audio input for HDMI | Internal | no data |
Supported technologies
Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.
| 3D Blu-Ray | + | - |
| 3D Gaming | + | - |
| 3D Vision | + | - |
API compatibility
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 | 4.3 | 4.6 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | 1.1.126 | 1.1.126 |
| CUDA | + | 3.5 |
Gaming performance
Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.
Average FPS across all PC games
Here are the average frames per second in a large set of popular games across different resolutions:
| Full HD | 47
+194%
| 16−18
−194%
|
Cost per frame, $
| 1080p | 4.87 | 5.56 |
Pros & cons summary
| Performance score | 10.36 | 3.55 |
| Recency | 6 September 2012 | 29 May 2013 |
| Maximum RAM amount | 2 GB | 1 GB |
| Power consumption (TDP) | 140 Watt | 49 Watt |
GTX 660 has a 191.8% higher aggregate performance score, and a 100% higher maximum VRAM amount.
GT 640 Rev. 2, on the other hand, has an age advantage of 8 months, and 185.7% lower power consumption.
The GeForce GTX 660 is our recommended choice as it beats the GeForce GT 640 Rev. 2 in performance tests.
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.
