Radeon HD 8990 OEM vs GeForce GTX 660M Mac Edition
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 968 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 2.15 | no data |
| Architecture | Kepler (2012−2018) | GCN 1.0 (2011−2020) |
| GPU code name | GK107 | Malta |
| Market segment | Laptop | Desktop |
| Release date | 1 April 2013 (11 years ago) | 24 April 2013 (11 years ago) |
| Launch price (MSRP) | no data | $999 |
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 | 2048 |
| Core clock speed | 950 MHz | 950 MHz |
| Boost clock speed | no data | 1000 MHz |
| Number of transistors | 1,270 million | 4,313 million |
| Manufacturing process technology | 28 nm | 28 nm |
| Power consumption (TDP) | 50 Watt | 375 Watt |
| Texture fill rate | 30.40 | 128.0 |
| Floating-point processing power | 0.7296 TFLOPS | 4.096 TFLOPS |
| ROPs | 16 | 32 |
| TMUs | 32 | 128 |
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 | MXM-B (3.0) | PCIe 3.0 x16 |
| Length | no data | 307 mm |
| Width | no data | 2-slot |
| Supplementary power connectors | None | 2x 8-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 | 512 MB | 3 GB |
| Memory bus width | 128 Bit | 384 Bit |
| Memory clock speed | 1250 MHz | 1500 MHz |
| Memory bandwidth | 80 GB/s | 288.0 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 | No outputs | 1x DVI, 4x mini-DisplayPort |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_0) | 12 (11_1) |
| Shader Model | 5.1 | 5.1 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | 1.1.126 | 1.2.131 |
| CUDA | 3.0 | - |
Pros & cons summary
| Maximum RAM amount | 512 MB | 3 GB |
| Power consumption (TDP) | 50 Watt | 375 Watt |
GTX 660M Mac Edition has 650% lower power consumption.
HD 8990 OEM, on the other hand, has a 500% higher maximum VRAM amount.
We couldn't decide between GeForce GTX 660M Mac Edition and Radeon HD 8990 OEM. We've got no test results to judge.
Be aware that GeForce GTX 660M Mac Edition is a notebook card while Radeon HD 8990 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.
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