Tesla P40 vs Tesla K20c

Place in the ranking	489	183
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.38	2.47
Power efficiency	2.73	8.39
Architecture	Kepler (2012−2018)	Pascal (2016−2021)
GPU code name	GK110	GP102
Market segment	Workstation	Workstation
Release date	12 November 2012 (12 years ago)	13 September 2016 (8 years ago)
Launch price (MSRP)	$3,199	$5,699

Cost-effectiveness evaluation

Performance to price ratio. The higher, the better.

Tesla P40 has 550% better value for money than Tesla K20c.

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	2496	3840
Core clock speed	706 MHz	1303 MHz
Boost clock speed	no data	1531 MHz
Number of transistors	7,080 million	11,800 million
Manufacturing process technology	28 nm	16 nm
Power consumption (TDP)	225 Watt	250 Watt
Texture fill rate	146.8	367.4
Floating-point processing power	3.524 TFLOPS	11.76 TFLOPS
ROPs	40	96
TMUs	208	240

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 3.0 x16
Length	267 mm	267 mm
Width	2-slot	2-slot
Supplementary power connectors	1x 6-pin + 1x 8-pin	8-pin EPS

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	5 GB	24 GB
Memory bus width	320 Bit	384 Bit
Memory clock speed	1300 MHz	1808 MHz
Memory bandwidth	208.0 GB/s	347.1 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

API compatibility

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX	12 (11_0)	12 (12_1)
Shader Model	5.1	6.7
OpenGL	4.6	4.6
OpenCL	1.2	3.0
Vulkan	1.1.126	1.3
CUDA	3.5	6.1

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	8.95	30.55
Recency	12 November 2012	13 September 2016
Maximum RAM amount	5 GB	24 GB
Chip lithography	28 nm	16 nm
Power consumption (TDP)	225 Watt	250 Watt

Tesla K20c has 11.1% lower power consumption.

Tesla P40, on the other hand, has a 241.3% higher aggregate performance score, an age advantage of 3 years, a 380% higher maximum VRAM amount, and a 75% more advanced lithography process.

The Tesla P40 is our recommended choice as it beats the Tesla K20c in performance tests.

Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.