GeForce GTX 660 Rev. 2 vs Radeon HD 6990M
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 610 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 3.63 | no data |
| Architecture | TeraScale 2 (2009−2015) | Kepler (2012−2018) |
| GPU code name | Blackcomb | GK104 |
| Market segment | Laptop | Desktop |
| Release date | 12 July 2011 (13 years ago) | 13 September 2014 (10 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 | 1120 | 960 |
| Core clock speed | 715 MHz | 980 MHz |
| Boost clock speed | no data | 1032 MHz |
| Number of transistors | 1,700 million | 3,540 million |
| Manufacturing process technology | 40 nm | 28 nm |
| Power consumption (TDP) | 100 Watt | 140 Watt |
| Texture fill rate | 40.04 | 82.56 |
| Floating-point processing power | 1.602 TFLOPS | 1.981 TFLOPS |
| ROPs | 32 | 24 |
| TMUs | 56 | 80 |
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 |
| Interface | MXM-B (3.0) | PCIe 3.0 x16 |
| Length | no data | 241 mm |
| Width | no data | 2-slot |
| Supplementary power connectors | None | 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 | GDDR5 | GDDR5 |
| Maximum RAM amount | 2 GB | 2 GB |
| Memory bus width | 256 Bit | 192 Bit |
| Memory clock speed | 900 MHz | 1502 MHz |
| Memory bandwidth | 115.2 GB/s | 144.2 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 HDMI, 1x DisplayPort |
| HDMI | - | + |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 11.2 (11_0) | 12 (11_0) |
| Shader Model | 5.0 | 5.1 |
| OpenGL | 4.4 | 4.6 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | N/A | 1.1.126 |
| CUDA | - | 3.0 |
Pros & cons summary
| Recency | 12 July 2011 | 13 September 2014 |
| Chip lithography | 40 nm | 28 nm |
| Power consumption (TDP) | 100 Watt | 140 Watt |
HD 6990M has 40% lower power consumption.
GTX 660 Rev. 2, on the other hand, has an age advantage of 3 years, and a 42.9% more advanced lithography process.
We couldn't decide between Radeon HD 6990M and GeForce GTX 660 Rev. 2. We've got no test results to judge.
Be aware that Radeon HD 6990M is a notebook card while GeForce GTX 660 Rev. 2 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.
