GeForce GT 645M vs Radeon HD 6990
When choosing between GeForce GT 645M and Radeon HD 6990, 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 6990.
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 6990
Power consumption (TDP)
32 Watt
375 Watt
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
2x 8-pin
Memory type
DDR3\GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Display Connectors
No outputs
1x DVI, 4x mini-DisplayPort
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Radeon HD 6990 has 1071% more power consumption, than GeForce GT 645M.
GeForce GT 645M is connected by PCIe 3.0 x16, and Radeon HD 6990 uses PCIe 2.0 x16 interface.
GeForce GT 645M and Radeon HD 6990 have maximum RAM of 2 GB.
GeForce GT 645M is used in Laptops, and Radeon HD 6990 - in Desktops.
GeForce GT 645M is build with Kepler architecture, and Radeon HD 6990 - with TeraScale 3.
GeForce GT 645M is manufactured by 28 nm process technology, and Radeon HD 6990 - by 40 nm process technology.
Memory clock speed of Radeon HD 6990 is 3200 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
14−16
ultra / 1080p
0−1
9−10
QHD / 1440p
0−1
3−4
low / 720p
12−14
30−35
medium / 1080p
2−3
18−20
The average gaming FPS of Radeon HD 6990 in Assassin's Creed Odyssey is 340% more, than GeForce GT 645M.
high / 1080p
−
24−27
ultra / 1080p
3−4
21−24
QHD / 1440p
0−1
7−8
4K / 2160p
−
5−6
low / 720p
12−14
50−55
medium / 1080p
4−5
27−30
The average gaming FPS of Radeon HD 6990 in Battlefield 5 is 385% more, than GeForce GT 645M.
low / 768p
50−55
45−50
high / 1080p
45−50
−
QHD / 1440p
0−1
0−1
The average gaming FPS of GeForce GT 645M in Call of Duty: Warzone is 10% more, than Radeon HD 6990.
low / 768p
110−120
210−220
medium / 768p
85−90
170−180
ultra / 1080p
35−40
95−100
QHD / 1440p
−
50−55
4K / 2160p
10−11
30−33
high / 768p
60−65
140−150
The average gaming FPS of Radeon HD 6990 in Counter-Strike: Global Offensive is 112% more, than GeForce GT 645M.
low / 768p
70−75
55−60
ultra / 1080p
14−16
40−45
medium / 1080p
45−50
45−50
The average gaming FPS of Radeon HD 6990 in Cyberpunk 2077 is 8% more, than GeForce GT 645M.
low / 768p
70−75
110−120
medium / 768p
45−50
90−95
ultra / 1080p
18−20
60−65
The average gaming FPS of Radeon HD 6990 in Dota 2 is 95% more, than GeForce GT 645M.
high / 1080p
2−3
18−20
ultra / 1080p
2−3
16−18
4K / 2160p
0−1
6−7
low / 720p
10−11
35−40
medium / 1080p
3−4
18−20
The average gaming FPS of Radeon HD 6990 in Far Cry 5 is 475% more, than GeForce GT 645M.
high / 1080p
−
24−27
ultra / 1080p
5−6
18−20
QHD / 1440p
1−2
16−18
low / 720p
45−50
95−100
medium / 1080p
8−9
50−55
The average gaming FPS of Radeon HD 6990 in Fortnite is 206% more, than GeForce GT 645M.
high / 1080p
3−4
24−27
ultra / 1080p
−
20−22
QHD / 1440p
0−1
9−10
low / 720p
14−16
50−55
medium / 1080p
6−7
27−30
The average gaming FPS of Radeon HD 6990 in Forza Horizon 4 is 337% more, than GeForce GT 645M.
low / 768p
40−45
85−90
medium / 768p
−
75−80
high / 1080p
3−4
30−33
ultra / 1080p
2−3
12−14
QHD / 1440p
0−1
3−4
medium / 720p
35−40
−
The average gaming FPS of Radeon HD 6990 in Grand Theft Auto V is 175% more, than GeForce GT 645M.
high / 1080p
1−2
9−10
ultra / 1080p
0−1
7−8
4K / 2160p
0−1
2−3
low / 720p
3−4
27−30
medium / 1080p
2−3
12−14
The average gaming FPS of Radeon HD 6990 in Metro Exodus is 750% more, than GeForce GT 645M.
low / 768p
85−90
110−120
high / 1080p
55−60
−
ultra / 1080p
−
100−110
medium / 1080p
−
100−110
The average gaming FPS of Radeon HD 6990 in Minecraft is 32% more, than GeForce GT 645M.
high / 1080p
14−16
21−24
ultra / 1080p
12−14
18−20
low / 720p
24−27
55−60
medium / 1080p
14−16
24−27
The average gaming FPS of Radeon HD 6990 in PLAYERUNKNOWN'S BATTLEGROUNDS is 82% more, than GeForce GT 645M.
high / 1080p
−
14−16
ultra / 1080p
3−4
9−10
QHD / 1440p
0−1
0−1
low / 720p
4−5
27−30
medium / 1080p
−
16−18
The average gaming FPS of Radeon HD 6990 in Red Dead Redemption 2 is 375% more, than GeForce GT 645M.
low / 768p
8−9
55−60
medium / 768p
7−8
30−35
high / 1080p
3−4
18−20
ultra / 1080p
3−4
10−12
4K / 2160p
0−1
8−9
The average gaming FPS of Radeon HD 6990 in The Witcher 3: Wild Hunt is 500% more, than GeForce GT 645M.
low / 768p
70−75
100−110
medium / 768p
35−40
60−65
ultra / 1080p
12−14
35−40
high / 768p
30−33
50−55
The average gaming FPS of Radeon HD 6990 in World of Tanks is 68% more, than GeForce GT 645M.
Full Specs
GeForce GT 645M
Radeon HD 6990
Architecture
Kepler
TeraScale 3
Code name
N13P-GS
Antilles
Type
Laptop
Desktop
Release date
22 March 2012
8 March 2011
Pipelines
384
1536
Core clock speed
830 MHz
Transistor count
1,270 million
2,640 million
Manufacturing process technology
28 nm
40 nm
Texture fill rate
22.7 billion/sec
79.68
Floating-point performance
544.5 gflops
2x 2,549.8 gflops
Length
295 mm
Memory bus width
128bit
256 Bit
Memory clock speed
1800 MHz
5000 MHz
Memory bandwidth
160.0 GB/s
Shared memory
-
DirectX
12 API
11.2 (11_0)
Shader Model
5.1
5.0
OpenGL
4.5
4.4
OpenCL
1.1
1.2
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
265 Mh/s
Laptop size
medium sized
Optimus
+
Ethereum / ETH (DaggerHashimoto)
24 Mh/s
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