Radeon Sky 900 vs HD 7990
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 373 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 1.31 | no data |
| Power efficiency | 2.62 | no data |
| Architecture | GCN 1.0 (2011−2020) | GCN 1.0 (2011−2020) |
| GPU code name | Malta | Tahiti |
| Market segment | Desktop | Workstation |
| Release date | 24 April 2013 (11 years ago) | 27 March 2013 (11 years ago) |
| Launch price (MSRP) | $999 | no data |
Cost-effectiveness evaluation
The higher the performance-to-price ratio, the better. We use the manufacturer's recommended prices for comparison.
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 | 2048 ×2 | 3584 ×2 |
| Core clock speed | 950 MHz | 825 MHz |
| Boost clock speed | 1000 MHz | 950 MHz |
| Number of transistors | 4,313 million | 4,313 million |
| Manufacturing process technology | 28 nm | 28 nm |
| Power consumption (TDP) | 375 Watt | 300 Watt |
| Texture fill rate | 128.0 ×2 | 106.4 ×2 |
| Floating-point processing power | 4.096 TFLOPS ×2 | 3.405 TFLOPS ×2 |
| ROPs | 32 ×2 | 32 ×2 |
| TMUs | 128 ×2 | 112 ×2 |
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 | no data | PCIe 3.0 |
| Interface | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Length | 307 mm | 305 mm |
| Width | 2-slot | 2-slot |
| Form factor | no data | full height / full length |
| Supplementary power connectors | 2x 8-pin | 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 | 3 GB ×2 | 6 GB ×2 |
| Memory bus width | 384 Bit ×2 | 384 Bit ×2 |
| Memory clock speed | 1500 MHz | 1250 MHz |
| Memory bandwidth | 288.0 GB/s ×2 | 480 GB/s ×2 |
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 | 1x DVI, 4x mini-DisplayPort | 1x DVI, 1x mini-DisplayPort |
| Dual-link DVI support | - | + |
API and SDK compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_1) | 12 (11_1) |
| Shader Model | 5.1 | 5.1 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | 1.2.131 | 1.2.131 |
Pros & cons summary
| Maximum RAM amount | 3 GB | 6 GB |
| Power consumption (TDP) | 375 Watt | 300 Watt |
Sky 900 has a 100% higher maximum VRAM amount, and 25% lower power consumption.
We couldn't decide between Radeon HD 7990 and Radeon Sky 900. We've got no test results to judge.
Be aware that Radeon HD 7990 is a desktop card while Radeon Sky 900 is a workstation one.
Other comparisons
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