Iris Plus Graphics 645 vs Tesla K20c

Place in the ranking	491	667
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.39	no data
Power efficiency	2.75	20.50
Architecture	Kepler (2012−2018)	Generation 9.5 (2016−2020)
GPU code name	GK110	Coffee Lake GT3e
Market segment	Workstation	Laptop
Release date	12 November 2012 (12 years ago)	7 October 2019 (5 years ago)
Launch price (MSRP)	$3,199	no data

Cost-effectiveness evaluation

Performance to price ratio. The higher, the better.

no data

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	384
Core clock speed	706 MHz	300 MHz
Boost clock speed	no data	1050 MHz
Number of transistors	7,080 million	no data
Manufacturing process technology	28 nm	14 nm+++
Power consumption (TDP)	225 Watt	15 Watt
Texture fill rate	146.8	50.40
Floating-point processing power	3.524 TFLOPS	0.8064 TFLOPS
ROPs	40	6
TMUs	208	48

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	Ring Bus
Length	267 mm	no data
Width	2-slot	no data
Supplementary power connectors	1x 6-pin + 1x 8-pin	no data

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	System Shared
Maximum RAM amount	5 GB	System Shared
Memory bus width	320 Bit	System Shared
Memory clock speed	1300 MHz	System Shared
Memory bandwidth	208.0 GB/s	no data
Shared memory	-	+

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

Portable Device Dependent

Supported technologies

Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.

Quick Sync

no data

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	6.4
OpenGL	4.6	4.6
OpenCL	1.2	3.0
Vulkan	1.1.126	1.3
CUDA	3.5	-

Gaming performance

Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.

Average FPS across all PC games

Here are the average frames per second in a large set of popular games across different resolutions:

Full HD

50−55
+100%

−100%

Cost per frame, $

1080p

63.98

no data

FPS performance in popular games

Full HD
Low Preset

Counter-Strike 2	10−11 +0%	10−11 +0%
Cyberpunk 2077	10−11 +0%	10−11 +0%

Full HD
Medium Preset

Battlefield 5	12−14 +0%	12−14 +0%
Counter-Strike 2	10−11 +0%	10−11 +0%
Cyberpunk 2077	10−11 +0%	10−11 +0%
Forza Horizon 4	18−20 +0%	18−20 +0%
Forza Horizon 5	8−9 +0%	8−9 +0%
Metro Exodus	10−11 +0%	10−11 +0%
Red Dead Redemption 2	14−16 +0%	14−16 +0%
Valorant	10−12 +0%	10−12 +0%

Full HD
High Preset

Battlefield 5	12−14 +0%	12−14 +0%
Counter-Strike 2	10−11 +0%	10−11 +0%
Cyberpunk 2077	10−11 +0%	10−11 +0%
Dota 2	10 +0%	10 +0%
Far Cry 5	23 +0%	23 +0%
Fortnite	24−27 +0%	24−27 +0%
Forza Horizon 4	18−20 +0%	18−20 +0%
Forza Horizon 5	8−9 +0%	8−9 +0%
Grand Theft Auto V	14−16 +0%	14−16 +0%
Metro Exodus	10−11 +0%	10−11 +0%
PLAYERUNKNOWN'S BATTLEGROUNDS	35−40 +0%	35−40 +0%
Red Dead Redemption 2	14−16 +0%	14−16 +0%
The Witcher 3: Wild Hunt	14−16 +0%	14−16 +0%
Valorant	10−12 +0%	10−12 +0%
World of Tanks	70−75 +0%	70−75 +0%

Full HD
Ultra Preset

Battlefield 5	12−14 +0%	12−14 +0%
Counter-Strike 2	10−11 +0%	10−11 +0%
Cyberpunk 2077	10−11 +0%	10−11 +0%
Dota 2	27 +0%	27 +0%
Far Cry 5	21−24 +0%	21−24 +0%
Forza Horizon 4	18−20 +0%	18−20 +0%
Forza Horizon 5	8−9 +0%	8−9 +0%
PLAYERUNKNOWN'S BATTLEGROUNDS	35−40 +0%	35−40 +0%
Valorant	10−12 +0%	10−12 +0%

1440p
High Preset

Dota 2	4−5 +0%	4−5 +0%
Grand Theft Auto V	4−5 +0%	4−5 +0%
PLAYERUNKNOWN'S BATTLEGROUNDS	30−33 +0%	30−33 +0%
Red Dead Redemption 2	3−4 +0%	3−4 +0%
World of Tanks	30−35 +0%	30−35 +0%

1440p
Ultra Preset

Battlefield 5	6−7 +0%	6−7 +0%
Counter-Strike 2	30−35 +0%	30−35 +0%
Cyberpunk 2077	5−6 +0%	5−6 +0%
Far Cry 5	10−11 +0%	10−11 +0%
Forza Horizon 4	6−7 +0%	6−7 +0%
Forza Horizon 5	6−7 +0%	6−7 +0%
Metro Exodus	2−3 +0%	2−3 +0%
The Witcher 3: Wild Hunt	7−8 +0%	7−8 +0%
Valorant	12−14 +0%	12−14 +0%

4K
High Preset

Dota 2	16−18 +0%	16−18 +0%
Grand Theft Auto V	16−18 +0%	16−18 +0%
Metro Exodus	0−1	0−1
PLAYERUNKNOWN'S BATTLEGROUNDS	12−14 +0%	12−14 +0%
Red Dead Redemption 2	3−4 +0%	3−4 +0%
The Witcher 3: Wild Hunt	16−18 +0%	16−18 +0%

4K
Ultra Preset

Battlefield 5	4−5 +0%	4−5 +0%
Cyberpunk 2077	2−3 +0%	2−3 +0%
Dota 2	16−18 +0%	16−18 +0%
Far Cry 5	5−6 +0%	5−6 +0%
Fortnite	3−4 +0%	3−4 +0%
Forza Horizon 4	3−4 +0%	3−4 +0%
Forza Horizon 5	2−3 +0%	2−3 +0%
Valorant	4−5 +0%	4−5 +0%

This is how Tesla K20c and Iris Plus Graphics 645 compete in popular games:

Tesla K20c is 100% faster in 1080p

All in all, in popular games:

there's a draw in 61 test (100%)

Pros & cons summary

Performance score	8.97	4.46
Recency	12 November 2012	7 October 2019
Chip lithography	28 nm	14 nm
Power consumption (TDP)	225 Watt	15 Watt

Tesla K20c has a 101.1% higher aggregate performance score.

Iris Plus Graphics 645, on the other hand, has an age advantage of 6 years, a 100% more advanced lithography process, and 1400% lower power consumption.

The Tesla K20c is our recommended choice as it beats the Iris Plus Graphics 645 in performance tests.

Be aware that Tesla K20c is a workstation card while Iris Plus Graphics 645 is a notebook one.

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