GeForce GT 640 OEM Rebrand vs Tesla K8
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 514 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 6.98 | no data |
| Architecture | Kepler (2012−2018) | Fermi 2.0 (2010−2014) |
| GPU code name | GK104 | GF116 |
| Market segment | Workstation | Desktop |
| Release date | 16 September 2014 (11 years ago) | 24 April 2012 (13 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 | 1536 | 144 |
| Core clock speed | 693 MHz | 720 MHz |
| Boost clock speed | 811 MHz | no data |
| Number of transistors | 3,540 million | 1,170 million |
| Manufacturing process technology | 28 nm | 40 nm |
| Power consumption (TDP) | 100 Watt | 75 Watt |
| Texture fill rate | 103.8 | 17.28 |
| Floating-point processing power | 2.491 TFLOPS | 0.4147 TFLOPS |
| ROPs | 32 | 24 |
| TMUs | 128 | 24 |
| L1 Cache | 128 KB | 192 KB |
| L2 Cache | 512 KB | 384 KB |
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 | 241 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 | GDDR5 | DDR3 |
| Maximum RAM amount | 8 GB | 1536 MB |
| Memory bus width | 256 Bit | 192 Bit |
| Memory clock speed | 1250 MHz | 800 MHz |
| Memory bandwidth | 160.0 GB/s | 38.4 GB/s |
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 | No outputs | 2x DVI, 1x mini-HDMI |
| HDMI | - | + |
API and SDK support
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_0) | 12 (11_0) |
| Shader Model | 5.1 | 5.1 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 1.1 |
| Vulkan | 1.1.126 | N/A |
| CUDA | 3.0 | 2.1 |
Pros & cons summary
| Recency | 16 September 2014 | 24 April 2012 |
| Maximum RAM amount | 8 GB | 1536 MB |
| Chip lithography | 28 nm | 40 nm |
| Power consumption (TDP) | 100 Watt | 75 Watt |
Tesla K8 has an age advantage of 2 years, a 433.3% higher maximum VRAM amount, and a 42.9% more advanced lithography process.
GT 640 OEM Rebrand, on the other hand, has 33.3% lower power consumption.
We couldn't decide between Tesla K8 and GeForce GT 640 OEM Rebrand. We've got no test results to judge.
Be aware that Tesla K8 is a workstation graphics card while GeForce GT 640 OEM Rebrand is a desktop one.
Other comparisons
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