GeForce GT 640 OEM Rebrand vs Radeon HD 6790
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 684 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 0.86 | no data |
| Power efficiency | 1.92 | no data |
| Architecture | TeraScale 2 (2009−2015) | Fermi 2.0 (2010−2014) |
| GPU code name | Barts | GF116 |
| Market segment | Desktop | Desktop |
| Release date | 4 April 2011 (13 years ago) | 24 April 2012 (12 years ago) |
| Launch price (MSRP) | $149 | no data |
Cost-effectiveness evaluation
Performance to price ratio. The higher, the better.
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 | 800 | 144 |
| Core clock speed | 840 MHz | 720 MHz |
| Number of transistors | 1,700 million | 1,170 million |
| Manufacturing process technology | 40 nm | 40 nm |
| Power consumption (TDP) | 150 Watt | 75 Watt |
| Texture fill rate | 33.60 | 17.28 |
| Floating-point processing power | 1.344 TFLOPS | 0.4147 TFLOPS |
| ROPs | 16 | 24 |
| TMUs | 40 | 24 |
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 2.0 x16 | PCIe 2.0 x16 |
| Length | 198 mm | 145 mm |
| Width | 2-slot | 1-slot |
| Supplementary power connectors | 2x 6-pin | None |
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 | DDR3 |
| Maximum RAM amount | 1 GB | 1536 MB |
| Memory bus width | 256 Bit | 192 Bit |
| Memory clock speed | 1050 MHz | 800 MHz |
| Memory bandwidth | 134.4 GB/s | 38.4 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 | 2x DVI, 1x HDMI, 1x DisplayPort | 2x DVI, 1x mini-HDMI |
| 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 | 1.1 |
| Vulkan | N/A | N/A |
| CUDA | - | 2.1 |
Pros & cons summary
| Recency | 4 April 2011 | 24 April 2012 |
| Maximum RAM amount | 1 GB | 1536 MB |
| Power consumption (TDP) | 150 Watt | 75 Watt |
GT 640 OEM Rebrand has an age advantage of 1 year, a 50% higher maximum VRAM amount, and 100% lower power consumption.
We couldn't decide between Radeon HD 6790 and GeForce GT 640 OEM Rebrand. We've got no test results to judge.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
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