GeForce GT 645M vs Mobility Radeon HD 3870 X2
In this comparison between GeForce GT 645M and Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2 will be their preference. Study the comparison tables below and make your choice.
GeForce GT 645M and Mobility Radeon HD 3870 X2 are Laptop Graphics Cards
Note: GeForce GT 645M and Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2 here:
Main Specs
GeForce GT 645M
Mobility Radeon HD 3870 X2
Power consumption (TDP)
32 Watt
110 Watt
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Memory type
DDR3\GDDR5
GDDR3
Maximum RAM amount
2 GB
512 MB
Display Connectors
No outputs
No outputs
Check Price
Check Price
Mobility Radeon HD 3870 X2 has 243% more power consumption, than GeForce GT 645M.
GeForce GT 645M is connected by PCIe 3.0 x16, and Mobility Radeon HD 3870 X2 uses PCIe 2.0 x16 interface.
Mobility Radeon HD 3870 X2 has 510 GB more memory, than GeForce GT 645M.
Both cards are used in Laptops.
GeForce GT 645M is build with Kepler architecture, and Mobility Radeon HD 3870 X2 - with RV6xx.
GeForce GT 645M is manufactured by 28 nm process technology, and Mobility Radeon HD 3870 X2 - by 55 nm process technology.
Memory clock speed of GeForce GT 645M is 950 MHz higher, than Mobility Radeon HD 3870 X2.
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 Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2.
low / 768p
110−120
130−140
medium / 768p
85−90
110−120
ultra / 1080p
35−40
50−55
QHD / 1440p
−
27−30
4K / 2160p
10−11
27−30
high / 768p
60−65
80−85
The average gaming FPS of Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2.
low / 768p
70−75
80−85
medium / 768p
45−50
55−60
ultra / 1080p
18−20
30−35
The average gaming FPS of Mobility Radeon HD 3870 X2 in Dota 2 is 23% more, than GeForce GT 645M.
high / 1080p
2−3
8−9
ultra / 1080p
2−3
7−8
4K / 2160p
0−1
3−4
low / 720p
10−11
18−20
medium / 1080p
3−4
8−9
The average gaming FPS of Mobility Radeon HD 3870 X2 in Far Cry 5 is 150% 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 Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2 in Grand Theft Auto V is 50% more, than GeForce GT 645M.
high / 1080p
1−2
4−5
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 Mobility Radeon HD 3870 X2 in Metro Exodus is 300% more, than GeForce GT 645M.
low / 768p
85−90
95−100
high / 1080p
55−60
85−90
ultra / 1080p
−
80−85
medium / 1080p
−
90−95
The average gaming FPS of Mobility Radeon HD 3870 X2 in Minecraft is 27% 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 Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2 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
18−20
high / 768p
30−33
35−40
The average gaming FPS of Mobility Radeon HD 3870 X2 in World of Tanks is 23% more, than GeForce GT 645M.
Full Specs
GeForce GT 645M
Mobility Radeon HD 3870 X2
Architecture
Kepler
RV6xx
Code name
N13P-GS
M88-XT CF
Type
Laptop
Laptop
Release date
22 March 2012
1 September 2008
Pipelines
384
640
Core clock speed
660 MHz
Transistor count
1,270 million
666 million
Manufacturing process technology
28 nm
55 nm
Texture fill rate
22.7 billion/sec
10.56
Floating-point performance
544.5 gflops
2x 422.4 gflops
Memory bus width
128bit
256 Bit
Memory clock speed
1800 MHz
850 MHz
Memory bandwidth
54.4 GB/s
Shared memory
-
-
DirectX
12 API
10.1 (10_1)
Shader Model
5.1
4.1
OpenGL
4.5
3.3
OpenCL
1.1
N/A
Vulkan
1.1.126
N/A
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
+
Check Price
Check Price
