Tesla K20X vs Tesla K40s
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 | Kepler (2012−2018) | Kepler (2012−2018) |
| GPU code name | GK110B | GK110 |
| Market segment | Workstation | Workstation |
| Release date | 22 November 2013 (10 years ago) | 12 November 2012 (11 years ago) |
| Launch price (MSRP) | $7,699 | $7,699 |
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 | 2880 | 2688 |
| Core clock speed | 745 MHz | 732 MHz |
| Boost clock speed | 876 MHz | no data |
| Number of transistors | 7,080 million | 7,080 million |
| Manufacturing process technology | 28 nm | 28 nm |
| Power consumption (TDP) | 245 Watt | 235 Watt |
| Texture fill rate | 210.2 | 164.0 |
| Floating-point processing power | 5.046 TFLOPS | 3.935 TFLOPS |
| ROPs | 48 | 48 |
| TMUs | 240 | 224 |
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 | 267 mm | 267 mm |
| Width | 2-slot | 2-slot |
| Supplementary power connectors | no data | 1x 6-pin + 1x 8-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 | GDDR5 | GDDR5 |
| Maximum RAM amount | 12 GB | 6 GB |
| Memory bus width | 384 Bit | 384 Bit |
| Memory clock speed | 1502 MHz | 1300 MHz |
| Memory bandwidth | 288.4 GB/s | 249.6 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 | No outputs | No outputs |
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 | 1.1.126 | 1.1.126 |
| CUDA | 3.5 | 3.5 |
Pros & cons summary
| Recency | 22 November 2013 | 12 November 2012 |
| Maximum RAM amount | 12 GB | 6 GB |
| Power consumption (TDP) | 245 Watt | 235 Watt |
Tesla K40s has an age advantage of 1 year, and a 100% higher maximum VRAM amount.
Tesla K20X, on the other hand, has 4.3% lower power consumption.
We couldn't decide between Tesla K40s and Tesla K20X. 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.
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