GeForce GT 645M vs Radeon HD 7870M
In this comparison between GeForce GT 645M and Radeon HD 7870M you will find out which graphics card performs better in today's games. Bear in mind that third-party versions may have more efficient cooling and higher clock speeds. This will increase cards' performance, though not by much. In addition to raw power you should also take into account the dimensions. Thicker models simply will not fit into a small mini-ITX case. The resolution of your monitor also affects the choice, since 4K gameplay requires a more powerful GPU. And don't overspend on the graphics card. Other parts of your build may also need to be upgraded, save some money for the CPU or power supply. For some people GeForce GT 645M will be the best choice, for others Radeon HD 7870M will be their preference. Study the comparison tables below and make your choice.
GeForce GT 645M and Radeon HD 7870M are Laptop Graphics Cards
Note: GeForce GT 645M and Radeon HD 7870M are only used in laptop graphics. They have 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 or Radeon HD 7870M here:
Main Specs
GeForce GT 645M
Radeon HD 7870M
Power consumption (TDP)
32 Watt
45 Watt
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Memory type
DDR3\GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Display Connectors
No outputs
No outputs
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Radeon HD 7870M has 40% more power consumption, than GeForce GT 645M.
Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
GeForce GT 645M and Radeon HD 7870M have maximum RAM of 2 GB.
Both cards are used in Laptops.
GeForce GT 645M is build with Kepler architecture, and Radeon HD 7870M - with GCN.
GeForce GT 645M and Radeon HD 7870M are manufactured by 28 nm process technology.
Memory clock speed of Radeon HD 7870M is 2200 MHz higher, than GeForce GT 645M.
Game benchmarks
Assassin's Creed Odyssey
Battlefield 5
Call of Duty: Warzone
Counter-Strike: Global Offensive
Cyberpunk 2077
Dota 2
Far Cry 5
Fortnite
Forza Horizon 4
Grand Theft Auto V
Metro Exodus
Minecraft
PLAYERUNKNOWN'S BATTLEGROUNDS
Red Dead Redemption 2
The Witcher 3: Wild Hunt
World of Tanks
high / 1080p
1−2
6−7
ultra / 1080p
0−1
4−5
QHD / 1440p
0−1
0−1
low / 720p
12−14
16−18
medium / 1080p
2−3
8−9
The average gaming FPS of Radeon HD 7870M in Assassin's Creed Odyssey is 100% more, than GeForce GT 645M.
high / 1080p
−
12−14
ultra / 1080p
3−4
10−11
QHD / 1440p
0−1
0−1
low / 720p
12−14
24−27
medium / 1080p
4−5
12−14
The average gaming FPS of Radeon HD 7870M in Battlefield 5 is 128% more, than GeForce GT 645M.
low / 768p
50−55
45−50
high / 1080p
45−50
45−50
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GT 645M in Call of Duty: Warzone is 6% more, than Radeon HD 7870M.
low / 768p
110−120
130−140
medium / 768p
85−90
110−120
ultra / 1080p
35−40
50−55
QHD / 1440p
−
30−33
4K / 2160p
10−11
27−30
high / 768p
60−65
80−85
The average gaming FPS of Radeon HD 7870M in Counter-Strike: Global Offensive is 32% more, than GeForce GT 645M.
low / 768p
70−75
55−60
ultra / 1080p
14−16
18−20
medium / 1080p
45−50
45−50
The average gaming FPS of GeForce GT 645M in Cyberpunk 2077 is 9% more, than Radeon HD 7870M.
low / 768p
70−75
80−85
medium / 768p
45−50
60−65
ultra / 1080p
18−20
30−35
The average gaming FPS of Radeon HD 7870M in Dota 2 is 28% more, than GeForce GT 645M.
high / 1080p
2−3
8−9
ultra / 1080p
2−3
8−9
4K / 2160p
0−1
3−4
low / 720p
10−11
18−20
medium / 1080p
3−4
9−10
The average gaming FPS of Radeon HD 7870M in Far Cry 5 is 175% more, than GeForce GT 645M.
high / 1080p
−
14−16
ultra / 1080p
5−6
10−11
QHD / 1440p
1−2
−
low / 720p
45−50
60−65
medium / 1080p
8−9
21−24
The average gaming FPS of Radeon HD 7870M in Fortnite is 55% more, than GeForce GT 645M.
high / 1080p
3−4
12−14
ultra / 1080p
−
10−12
QHD / 1440p
0−1
1−2
low / 720p
14−16
24−27
medium / 1080p
6−7
14−16
The average gaming FPS of Radeon HD 7870M in Forza Horizon 4 is 112% more, than GeForce GT 645M.
low / 768p
40−45
50−55
medium / 768p
−
45−50
high / 1080p
3−4
12−14
ultra / 1080p
2−3
6−7
QHD / 1440p
0−1
0−1
medium / 720p
35−40
−
The average gaming FPS of Radeon HD 7870M in Grand Theft Auto V is 50% more, than GeForce GT 645M.
high / 1080p
1−2
5−6
ultra / 1080p
0−1
3−4
4K / 2160p
0−1
0−1
low / 720p
3−4
12−14
medium / 1080p
2−3
6−7
The average gaming FPS of Radeon HD 7870M in Metro Exodus is 300% more, than GeForce GT 645M.
low / 768p
85−90
95−100
high / 1080p
55−60
90−95
ultra / 1080p
−
80−85
medium / 1080p
−
90−95
The average gaming FPS of Radeon HD 7870M in Minecraft is 31% more, than GeForce GT 645M.
high / 1080p
14−16
16−18
ultra / 1080p
12−14
14−16
low / 720p
24−27
30−35
medium / 1080p
14−16
18−20
The average gaming FPS of Radeon HD 7870M in PLAYERUNKNOWN'S BATTLEGROUNDS is 17% more, than GeForce GT 645M.
ultra / 1080p
3−4
7−8
QHD / 1440p
0−1
0−1
low / 720p
4−5
12−14
medium / 1080p
−
10−12
The average gaming FPS of Radeon HD 7870M in Red Dead Redemption 2 is 150% more, than GeForce GT 645M.
low / 768p
8−9
24−27
medium / 768p
7−8
16−18
high / 1080p
3−4
9−10
ultra / 1080p
3−4
6−7
4K / 2160p
0−1
6−7
The average gaming FPS of Radeon HD 7870M in The Witcher 3: Wild Hunt is 180% more, than GeForce GT 645M.
low / 768p
70−75
85−90
medium / 768p
35−40
45−50
ultra / 1080p
12−14
20−22
high / 768p
30−33
35−40
The average gaming FPS of Radeon HD 7870M in World of Tanks is 26% more, than GeForce GT 645M.
Full Specs
GeForce GT 645M
Radeon HD 7870M
Architecture
Kepler
GCN
Code name
N13P-GS
Heathrow XT
Type
Laptop
Laptop
Release date
22 March 2012
24 April 2012
Pipelines
384
640
Core clock speed
800 MHz
Transistor count
1,270 million
1,500 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
22.7 billion/sec
32.00
Floating-point performance
544.5 gflops
1,024 gflops
Memory bus width
128bit
128 Bit
Memory clock speed
1800 MHz
4000 MHz
Memory bandwidth
64 GB/s
Shared memory
-
-
DirectX
12 API
12 (11_1)
Shader Model
5.1
5.1
OpenGL
4.5
4.6
OpenCL
1.1
1.2
Vulkan
1.1.126
1.2.131
CUDA
+
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
large
Optimus
+
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