GeForce 820A vs GeForce GT 645M

When choosing between GeForce 820A and GeForce GT 645M, it is worth examining the specifications of the models in detail. Do they meet the recommended requirements of modern games and software? Storage capacity, form factor, TDP, available ports, warranty and manufacturer support are all important. For example, the size of a PC case can limit the maximum thickness and length of the card. Often, instead of the factory overclocked card and RGB backlight, it is better to choose a reference model with a more efficient GPU. And make sure that your current power supply unit has the correct connection pins (using adapters is not recommended). This GPUs compare tool is meant to help you to choose the best graphics card for your build. Let's find out the difference between GeForce 820A and GeForce GT 645M.

GeForce 820A

GeForce GT 645M Check Price

GeForce GT 645M is a Laptop Graphics Card

Note: GeForce GT 645M is only used in laptop graphics. It has lower GPU clock speed compared to the desktop variant, which results in lower power consumption, but also 10-30% lower gaming performance. Check available laptop models with GeForce GT 645M here:

GeForce GT 645M Laptops

Main Specs

	GeForce 820A	GeForce GT 645M
Power consumption (TDP)	15 Watt	32 Watt
Interface	PCIe 2.0 x16	PCIe 3.0 x16
Memory type	DDR3	DDR3\GDDR5
Maximum RAM amount	1 GB	2 GB
Display Connectors	No outputs	No outputs
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GeForce GT 645M has 113% more power consumption, than GeForce 820A.
GeForce 820A is connected by PCIe 2.0 x16, and GeForce GT 645M uses PCIe 3.0 x16 interface.
GeForce GT 645M has 1 GB more memory, than GeForce 820A.
GeForce 820A is used in Desktops, and GeForce GT 645M - in Laptops.
GeForce 820A is build with Fermi 2.0 architecture, and GeForce GT 645M - with Kepler.
GeForce 820A and GeForce GT 645M are manufactured by 28 nm process technology.
Memory clock speed of GeForce 820A and GeForce GT 645M is 1800 MHz.

Game benchmarks


high / 1080p	0−1	1−2
ultra / 1080p	−	0−1
QHD / 1440p	0−1	0−1
low / 720p	1−2	12−14
medium / 1080p	0−1	2−3
The average gaming FPS of GeForce GT 645M in Assassin's Creed Odyssey is 1200% more, than GeForce 820A.
ultra / 1080p	−	3−4
QHD / 1440p	0−1	0−1
low / 720p	0−1	12−14
medium / 1080p	−	4−5
low / 768p	50−55	50−55
high / 1080p	45−50	45−50
QHD / 1440p	0−1	0−1
GeForce 820A and GeForce GT 645M have the same average FPS in Call of Duty: Warzone.
low / 768p	60−65	110−120
medium / 768p	27−30	85−90
ultra / 1080p	7−8	35−40
4K / 2160p	−	10−11
high / 768p	16−18	60−65
The average gaming FPS of GeForce GT 645M in Counter-Strike: Global Offensive is 167% more, than GeForce 820A.
low / 768p	70−75	70−75
ultra / 1080p	0−1	14−16
medium / 1080p	45−50	45−50
GeForce 820A and GeForce GT 645M have the same average FPS in Cyberpunk 2077.
low / 768p	45−50	70−75
medium / 768p	10−11	45−50
ultra / 1080p	0−1	18−20
The average gaming FPS of GeForce GT 645M in Dota 2 is 106% more, than GeForce 820A.
high / 1080p	−	2−3
ultra / 1080p	−	2−3
4K / 2160p	−	0−1
low / 720p	0−1	10−11
medium / 1080p	−	3−4
ultra / 1080p	−	5−6
QHD / 1440p	−	1−2
low / 720p	21−24	45−50
medium / 1080p	0−1	8−9
The average gaming FPS of GeForce GT 645M in Fortnite is 113% more, than GeForce 820A.
high / 1080p	0−1	3−4
QHD / 1440p	0−1	0−1
low / 720p	0−1	14−16
medium / 1080p	0−1	6−7
low / 768p	18−20	40−45
high / 1080p	0−1	3−4
ultra / 1080p	−	2−3
QHD / 1440p	0−1	0−1
medium / 720p	12−14	35−40
The average gaming FPS of GeForce GT 645M in Grand Theft Auto V is 150% more, than GeForce 820A.
high / 1080p	−	1−2
ultra / 1080p	−	0−1
4K / 2160p	−	0−1
low / 720p	0−1	3−4
medium / 1080p	−	2−3
low / 768p	75−80	85−90
high / 1080p	27−30	55−60
The average gaming FPS of GeForce GT 645M in Minecraft is 35% more, than GeForce 820A.
high / 1080p	−	14−16
ultra / 1080p	−	12−14
low / 720p	8−9	24−27
medium / 1080p	−	14−16
The average gaming FPS of GeForce GT 645M in PLAYERUNKNOWN'S BATTLEGROUNDS is 212% more, than GeForce 820A.
ultra / 1080p	−	3−4
QHD / 1440p	−	0−1
low / 720p	0−1	4−5
low / 768p	0−1	8−9
medium / 768p	−	7−8
high / 1080p	−	3−4
ultra / 1080p	−	3−4
4K / 2160p	−	0−1
low / 768p	45−50	70−75
medium / 768p	14−16	35−40
ultra / 1080p	0−1	12−14
high / 768p	12−14	30−33
The average gaming FPS of GeForce GT 645M in World of Tanks is 88% more, than GeForce 820A.

Full Specs

	GeForce 820A	GeForce GT 645M
Architecture	Fermi 2.0	Kepler
Code name	GF117	N13P-GS
Type	Desktop	Laptop
Release date	17 March 2014	22 March 2012
Pipelines	96	384
Core clock speed	775 MHz
Transistor count	585 million	1,270 million
Manufacturing process technology	28 nm	28 nm
Texture fill rate	12.40	22.7 billion/sec
Floating-point performance	297.6 gflops	544.5 gflops
Memory bus width	64 Bit	128bit
Memory clock speed	1800 MHz	1800 MHz
Memory bandwidth	14.4 GB/s
Shared memory		-
DirectX	12 (11_0)	12 API
Shader Model	5.1	5.1
OpenGL	4.6	4.5
OpenCL	1.1	1.1
Vulkan	N/A	1.1.126
CUDA	2.1	+
CUDA cores		384
Bus support		PCI Express 2.0, PCI Express 3.0
HDMI		+
HDCP		+
Maximum VGA resolution		Up to 2048x1536
3D Blu-Ray		+
Bitcoin / BTC (SHA256)		19 Mh/s
Laptop size		medium sized
Optimus		+
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GeForce 820A vs GeForce GT 645M

GeForce GT 645M is a Laptop Graphics Card

Main Specs

Game benchmarks

Full Specs

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