GeForce GT 640 OEM Rebrand vs Radeon HD 3850
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in performance ranking | 1067 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 0.37 | no data |
| Architecture | TeraScale (2005−2013) | Fermi 2.0 (2010−2014) |
| GPU code name | RV670 | GF116 |
| Market segment | Desktop | Desktop |
| Release date | 19 November 2007 (16 years ago) | 24 April 2012 (12 years ago) |
| Launch price (MSRP) | $179 | no data |
| Current price | $30 (0.2x MSRP) | no data |
Cost-effectiveness evaluation
Performance to price ratio. The higher, the better.
Detailed specifications
General performance parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. These parameters indirectly speak of performance, but for precise assessment you have to consider their benchmark and gaming test results. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.
| Pipelines / CUDA cores | 320 | 144 |
| Core clock speed | 668 MHz | 720 MHz |
| Number of transistors | 666 million | 1,170 million |
| Manufacturing process technology | 55 nm | 40 nm |
| Power consumption (TDP) | 75 Watt | 75 Watt |
| Texture fill rate | 10.69 | 17.28 |
| Floating-point performance | 427.5 gflops | 414.7 gflops |
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 | 208 mm | 145 mm |
| Width | 1-slot | 1-slot |
| Supplementary power connectors | 1x 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 | GDDR3 | DDR3 |
| Maximum RAM amount | 1 GB | 1536 MB |
| Memory bus width | 256 Bit | 192 Bit |
| Memory clock speed | 1660 MHz | 1600 MHz |
| Memory bandwidth | 53.12 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 S-Video | 2x DVI, 1x mini-HDMI |
| HDMI | no data | + |
API compatibility
List of supported graphics and general-purpose computing APIs, including their specific versions.
| DirectX | 10.1 (10_1) | 12 (11_0) |
| Shader Model | 4.1 | 5.1 |
| OpenGL | 3.3 | 4.6 |
| OpenCL | N/A | 1.1 |
| Vulkan | N/A | N/A |
| CUDA | no data | 2.1 |
Pros & cons summary
| Recency | 19 November 2007 | 24 April 2012 |
| Maximum RAM amount | 1 GB | 1536 MB |
| Chip lithography | 55 nm | 40 nm |
We couldn't decide between Radeon HD 3850 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.
Comparisons with similar GPUs
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