GeForce GT 640 Rev. 2 vs Radeon HD 7950
Aggregate performance score
We've compared Radeon HD 7950 and GeForce GT 640 Rev. 2, covering specs and all relevant benchmarks.
HD 7950 outperforms GT 640 Rev. 2 by a whopping 248% based on our aggregate benchmark results.
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 400 | 722 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 2.40 | 0.19 |
| Architecture | GCN 1.0 (2011−2020) | Kepler 2.0 (2013−2015) |
| GPU code name | Tahiti | GK208 |
| Market segment | Desktop | Desktop |
| Design | reference | no data |
| Release date | 31 January 2012 (12 years ago) | 29 May 2013 (11 years ago) |
| Launch price (MSRP) | $449 | $89 |
Cost-effectiveness evaluation
Performance to price ratio. The higher, the better.
HD 7950 has 1163% 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 | 1792 | 384 |
| Compute units | 28 | no data |
| Core clock speed | no data | 1046 MHz |
| Boost clock speed | 1250 MHz | no data |
| Number of transistors | 4,313 million | 915 million |
| Manufacturing process technology | 28 nm | 28 nm |
| Power consumption (TDP) | 200 Watt | 49 Watt |
| Texture fill rate | 89.60 | 33.47 |
| Floating-point processing power | 2.867 TFLOPS | 0.8033 TFLOPS |
| ROPs | 32 | 8 |
| TMUs | 112 | 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 | PCIe 3.0 x16 | no data |
| Interface | PCIe 3.0 x16 | PCIe 2.0 x8 |
| Length | 267 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 | GDDR5 |
| Maximum RAM amount | 3 GB | 1 GB |
| Memory bus width | 384 Bit | 64 Bit |
| Memory clock speed | 1250 MHz | 1252 MHz |
| Memory bandwidth | 240 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 | 1x DVI, 1x HDMI, 2x mini-DisplayPort | 1x DVI, 1x HDMI, 1x VGA |
| Eyefinity | + | - |
| Number of Eyefinity displays | 6 | no data |
| HDMI | + | + |
Supported technologies
Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.
| AppAcceleration | + | - |
| CrossFire | + | - |
| FreeSync | + | - |
| PowerTune | + | - |
| ZeroCore | + | - |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | DirectX® 11 | 12 (11_0) |
| Shader Model | 5.1 | 5.1 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | - | 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.
Pros & cons summary
| Performance score | 12.35 | 3.55 |
| Recency | 31 January 2012 | 29 May 2013 |
| Maximum RAM amount | 3 GB | 1 GB |
| Power consumption (TDP) | 200 Watt | 49 Watt |
HD 7950 has a 247.9% higher aggregate performance score, and a 200% higher maximum VRAM amount.
GT 640 Rev. 2, on the other hand, has an age advantage of 1 year, and 308.2% lower power consumption.
The Radeon HD 7950 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.
