GeForce GT 645M vs Radeon HD 7990
When choosing between GeForce GT 645M and Radeon HD 7990, 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 GT 645M and Radeon HD 7990.
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:
Main Specs
GeForce GT 645M
Radeon HD 7990
Power consumption (TDP)
32 Watt
375 Watt
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
2x 8-pin
Memory type
DDR3\GDDR5
GDDR5
Maximum RAM amount
2 GB
3 GB
Display Connectors
No outputs
1x DVI, 4x mini-DisplayPort
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Radeon HD 7990 has 1071% more power consumption, than GeForce GT 645M.
Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
Radeon HD 7990 has 1 GB more memory, than GeForce GT 645M.
GeForce GT 645M is used in Laptops, and Radeon HD 7990 - in Desktops.
GeForce GT 645M is build with Kepler architecture, and Radeon HD 7990 - with GCN 1.0.
GeForce GT 645M and Radeon HD 7990 are manufactured by 28 nm process technology.
Memory clock speed of Radeon HD 7990 is 4200 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
35−40
ultra / 1080p
0−1
21−24
QHD / 1440p
0−1
16−18
4K / 2160p
−
10−11
low / 720p
12−14
60−65
medium / 1080p
2−3
40−45
The average gaming FPS of Radeon HD 7990 in Assassin's Creed Odyssey is 840% more, than GeForce GT 645M.
high / 1080p
−
55−60
ultra / 1080p
3−4
45−50
QHD / 1440p
0−1
35−40
4K / 2160p
−
18−20
low / 720p
12−14
100−110
medium / 1080p
4−5
60−65
The average gaming FPS of Radeon HD 7990 in Battlefield 5 is 914% more, than GeForce GT 645M.
low / 768p
50−55
50−55
high / 1080p
45−50
−
QHD / 1440p
0−1
0−1
GeForce GT 645M and Radeon HD 7990 have the same average FPS in Call of Duty: Warzone.
low / 768p
110−120
250−260
medium / 768p
85−90
220−230
ultra / 1080p
35−40
180−190
QHD / 1440p
−
110−120
4K / 2160p
10−11
70−75
high / 768p
60−65
210−220
The average gaming FPS of Radeon HD 7990 in Counter-Strike: Global Offensive is 206% more, than GeForce GT 645M.
low / 768p
70−75
60−65
ultra / 1080p
14−16
−
medium / 1080p
45−50
55−60
GeForce GT 645M and Radeon HD 7990 have the same average FPS in Cyberpunk 2077.
low / 768p
70−75
120−130
medium / 768p
45−50
110−120
ultra / 1080p
18−20
100−110
The average gaming FPS of Radeon HD 7990 in Dota 2 is 150% more, than GeForce GT 645M.
high / 1080p
2−3
45−50
ultra / 1080p
2−3
40−45
QHD / 1440p
−
27−30
4K / 2160p
0−1
14−16
low / 720p
10−11
80−85
medium / 1080p
3−4
45−50
The average gaming FPS of Radeon HD 7990 in Far Cry 5 is 1275% more, than GeForce GT 645M.
high / 1080p
−
60−65
ultra / 1080p
5−6
45−50
QHD / 1440p
1−2
27−30
4K / 2160p
−
27−30
low / 720p
45−50
180−190
medium / 1080p
8−9
110−120
The average gaming FPS of Radeon HD 7990 in Fortnite is 526% more, than GeForce GT 645M.
high / 1080p
3−4
60−65
ultra / 1080p
−
45−50
QHD / 1440p
0−1
30−35
4K / 2160p
−
24−27
low / 720p
14−16
100−110
medium / 1080p
6−7
65−70
The average gaming FPS of Radeon HD 7990 in Forza Horizon 4 is 875% more, than GeForce GT 645M.
low / 768p
40−45
140−150
medium / 768p
−
120−130
high / 1080p
3−4
70−75
ultra / 1080p
2−3
30−35
QHD / 1440p
0−1
21−24
medium / 720p
35−40
−
The average gaming FPS of Radeon HD 7990 in Grand Theft Auto V is 418% more, than GeForce GT 645M.
high / 1080p
1−2
24−27
ultra / 1080p
0−1
20−22
QHD / 1440p
−
16−18
4K / 2160p
0−1
8−9
low / 720p
3−4
65−70
medium / 1080p
2−3
30−35
The average gaming FPS of Radeon HD 7990 in Metro Exodus is 1950% more, than GeForce GT 645M.
low / 768p
85−90
130−140
high / 1080p
55−60
−
medium / 1080p
−
120−130
The average gaming FPS of Radeon HD 7990 in Minecraft is 55% more, than GeForce GT 645M.
high / 1080p
14−16
−
ultra / 1080p
12−14
14−16
low / 720p
24−27
100−110
medium / 1080p
14−16
18−20
The average gaming FPS of Radeon HD 7990 in PLAYERUNKNOWN'S BATTLEGROUNDS is 170% more, than GeForce GT 645M.
high / 1080p
−
24−27
ultra / 1080p
3−4
16−18
QHD / 1440p
0−1
10−11
4K / 2160p
−
7−8
low / 720p
4−5
65−70
medium / 1080p
−
35−40
The average gaming FPS of Radeon HD 7990 in Red Dead Redemption 2 is 950% more, than GeForce GT 645M.
low / 768p
8−9
130−140
medium / 768p
7−8
85−90
high / 1080p
3−4
45−50
ultra / 1080p
3−4
24−27
4K / 2160p
0−1
16−18
The average gaming FPS of Radeon HD 7990 in The Witcher 3: Wild Hunt is 1360% more, than GeForce GT 645M.
low / 768p
70−75
90−95
medium / 768p
35−40
60−65
ultra / 1080p
12−14
50−55
high / 768p
30−33
60−65
The average gaming FPS of Radeon HD 7990 in World of Tanks is 76% more, than GeForce GT 645M.
Full Specs
GeForce GT 645M
Radeon HD 7990
Architecture
Kepler
GCN 1.0
Code name
N13P-GS
Malta
Type
Laptop
Desktop
Release date
22 March 2012
24 April 2013
Pipelines
384
2048
Core clock speed
950 MHz
Boost Clock
1000 MHz
Transistor count
1,270 million
4,313 million
Manufacturing process technology
28 nm
28 nm
Texture fill rate
22.7 billion/sec
128.0
Floating-point performance
544.5 gflops
2x 4,096 gflops
Length
307 mm
Memory bus width
128bit
384 Bit
Memory clock speed
1800 MHz
6000 MHz
Memory bandwidth
288.0 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
459 Mh/s
Laptop size
medium sized
Optimus
+
Ethereum / ETH (DaggerHashimoto)
44 Mh/s
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