GeForce 6800 GT Dual vs GT 640 OEM Rebrand
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | not rated | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Architecture | Fermi 2.0 (2010−2014) | Curie (2003−2013) |
| GPU code name | GF116 | NV45 |
| Market segment | Desktop | Desktop |
| Release date | 24 April 2012 (13 years ago) | 8 June 2004 (21 years ago) |
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 | 144 | no data |
| Core clock speed | 720 MHz | 350 MHz |
| Number of transistors | 1,170 million | 222 million |
| Manufacturing process technology | 40 nm | 130 nm |
| Power consumption (TDP) | 75 Watt | no data |
| Texture fill rate | 17.28 | 5.600 ×2 |
| Floating-point processing power | 0.4147 TFLOPS | no data |
| ROPs | 24 | 16 ×2 |
| TMUs | 24 | 16 ×2 |
| L1 Cache | 192 KB | no data |
| L2 Cache | 384 KB | no data |
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 1.0 x16 |
| Length | 145 mm | no data |
| Width | 1-slot | 2-slot |
| Supplementary power connectors | None | 1x 6-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 | DDR3 | GDDR3 |
| Maximum RAM amount | 1536 MB | 256 MB ×2 |
| Memory bus width | 192 Bit | 256 Bit ×2 |
| Memory clock speed | 800 MHz | 500 MHz |
| Memory bandwidth | 38.4 GB/s | 32 GB/s ×2 |
Connectivity and outputs
This section shows the types and number of video connectors on each GPU. The data applies specifically to desktop reference models (for example, NVIDIA’s Founders Edition). OEM partners often modify both the number and types of ports. On notebook GPUs, video‐output options are determined by the laptop’s design rather than the graphics chip itself.
| Display Connectors | 2x DVI, 1x mini-HDMI | 2x DVI, 1x S-Video |
| HDMI | + | - |
API and SDK support
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_0) | 9.0c (9_3) |
| Shader Model | 5.1 | 3.0 |
| OpenGL | 4.6 | 2.1 |
| OpenCL | 1.1 | N/A |
| Vulkan | N/A | N/A |
| CUDA | 2.1 | - |
Pros & cons summary
| Recency | 24 April 2012 | 8 June 2004 |
| Maximum RAM amount | 1536 MB | 256 MB |
| Chip lithography | 40 nm | 130 nm |
GT 640 OEM Rebrand has an age advantage of 7 years, a 500% higher maximum VRAM amount, and a 225% more advanced lithography process.
We couldn't decide between GeForce GT 640 OEM Rebrand and GeForce 6800 GT Dual. We've got no test results to judge.
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