GeForce GT 640 vs Radeon HD 7990
Aggregate performance score
We've compared Radeon HD 7990 and GeForce GT 640, covering specs and all relevant benchmarks.
HD 7990 outperforms GT 640 by a whopping 373% based on our aggregate benchmark results.
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 359 | 765 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 1.48 | 0.20 |
| Power efficiency | 2.68 | 3.27 |
| Architecture | GCN 1.0 (2011−2020) | Kepler (2012−2018) |
| GPU code name | Malta | GK107 |
| Market segment | Desktop | Desktop |
| Release date | 24 April 2013 (11 years ago) | 5 June 2012 (12 years ago) |
| Launch price (MSRP) | $999 | $99 |
Cost-effectiveness evaluation
Performance to price ratio. The higher, the better.
HD 7990 has 640% better value for money than GT 640.
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 | 384 |
| Core clock speed | 950 MHz | 902 MHz |
| Boost clock speed | 1000 MHz | no data |
| Number of transistors | 4,313 million | 1,270 million |
| Manufacturing process technology | 28 nm | 28 nm |
| Power consumption (TDP) | 375 Watt | 65 Watt |
| Texture fill rate | 128.0 | 28.86 |
| Floating-point processing power | 4.096 TFLOPS | 0.6927 TFLOPS |
| ROPs | 32 | 16 |
| TMUs | 128 | 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).
| Interface | PCIe 3.0 x16 | PCIe 3.0 x16 |
| Length | 307 mm | 145 mm |
| Width | 2-slot | 1-slot |
| Supplementary power connectors | 2x 8-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 | 3 GB | 2 GB |
| Memory bus width | 384 Bit | 128 Bit |
| Memory clock speed | 1500 MHz | 891 MHz |
| Memory bandwidth | 288.0 GB/s | 28.51 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, 4x mini-DisplayPort | 1x DVI, 1x HDMI, 1x DisplayPort |
| HDMI | - | + |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_1) | 12 (11_0) |
| Shader Model | 5.1 | 5.1 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | 1.2.131 | 1.1.126 |
| CUDA | - | 3.0 |
Synthetic benchmark performance
Non-gaming benchmark results comparison. The combined score is measured on a 0-100 point scale.
Combined synthetic benchmark score
This is our combined benchmark score. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
Passmark
This is the most ubiquitous GPU benchmark. It gives the graphics card a thorough evaluation under various types of load, providing four separate benchmarks for Direct3D versions 9, 10, 11 and 12 (the last being done in 4K resolution if possible), and few more tests engaging DirectCompute capabilities.
3DMark Fire Strike Graphics
Fire Strike is a DirectX 11 benchmark for gaming PCs. It features two separate tests displaying a fight between a humanoid and a fiery creature made of lava. Using 1920x1080 resolution, Fire Strike shows off some realistic graphics and is quite taxing on hardware.
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 | 14.43 | 3.05 |
| Recency | 24 April 2013 | 5 June 2012 |
| Maximum RAM amount | 3 GB | 2 GB |
| Power consumption (TDP) | 375 Watt | 65 Watt |
HD 7990 has a 373.1% higher aggregate performance score, an age advantage of 10 months, and a 50% higher maximum VRAM amount.
GT 640, on the other hand, has 476.9% lower power consumption.
The Radeon HD 7990 is our recommended choice as it beats the GeForce GT 640 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
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