Mobility Radeon HD 3870 X2 vs Radeon HD 6990M
If you are going to buy a new graphics card and are choosing between Mobility Radeon HD 3870 X2 and Radeon HD 6990M, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the Mobility Radeon HD 3870 X2 stacks up against Radeon HD 6990M, check out specs charts below.
Mobility Radeon HD 3870 X2 and Radeon HD 6990M are Laptop Graphics Cards
Note: Mobility Radeon HD 3870 X2 and Radeon HD 6990M 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 Mobility Radeon HD 3870 X2 or Radeon HD 6990M here:
Main Specs
Mobility Radeon HD 3870 X2
Radeon HD 6990M
Power consumption (TDP)
110 Watt
100 Watt
Interface
PCIe 2.0 x16
MXM-B (3.0)
Supplementary power connectors
None
Memory type
GDDR3
GDDR5
Maximum RAM amount
512 MB
2 GB
Display Connectors
No outputs
No outputs
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Mobility Radeon HD 3870 X2 has 10% more power consumption, than Radeon HD 6990M.
Mobility Radeon HD 3870 X2 is connected by PCIe 2.0 x16, and Radeon HD 6990M uses MXM-B (3.0) interface.
Mobility Radeon HD 3870 X2 has 510 GB more memory, than Radeon HD 6990M.
Both cards are used in Laptops.
Mobility Radeon HD 3870 X2 is build with RV6xx architecture, and Radeon HD 6990M - with Terascale 2.
Core clock speed of Radeon HD 6990M is 55 MHz higher, than Mobility Radeon HD 3870 X2.
Mobility Radeon HD 3870 X2 is manufactured by 55 nm process technology, and Radeon HD 6990M - by 40 nm process technology.
Memory clock speed of Radeon HD 6990M is 50 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
6−7
14−16
ultra / 1080p
4−5
8−9
QHD / 1440p
0−1
3−4
low / 720p
16−18
30−33
medium / 1080p
8−9
16−18
The average gaming FPS of Radeon HD 6990M in Assassin's Creed Odyssey is 100% more, than Mobility Radeon HD 3870 X2.
high / 1080p
12−14
21−24
ultra / 1080p
10−11
18−20
QHD / 1440p
0−1
6−7
4K / 2160p
−
5−6
low / 720p
24−27
45−50
medium / 1080p
12−14
24−27
The average gaming FPS of Radeon HD 6990M in Battlefield 5 is 86% more, than Mobility Radeon HD 3870 X2.
low / 768p
45−50
45−50
high / 1080p
45−50
−
QHD / 1440p
0−1
0−1
Mobility Radeon HD 3870 X2 and Radeon HD 6990M have the same average FPS in Call of Duty: Warzone.
low / 768p
130−140
200−210
medium / 768p
110−120
170−180
ultra / 1080p
50−55
90−95
QHD / 1440p
27−30
50−55
4K / 2160p
27−30
30−33
high / 768p
80−85
130−140
The average gaming FPS of Radeon HD 6990M in Counter-Strike: Global Offensive is 57% more, than Mobility Radeon HD 3870 X2.
low / 768p
55−60
55−60
ultra / 1080p
18−20
35−40
medium / 1080p
45−50
45−50
The average gaming FPS of Radeon HD 6990M in Cyberpunk 2077 is 14% more, than Mobility Radeon HD 3870 X2.
low / 768p
80−85
100−110
medium / 768p
55−60
90−95
ultra / 1080p
30−35
60−65
The average gaming FPS of Radeon HD 6990M in Dota 2 is 50% more, than Mobility Radeon HD 3870 X2.
high / 1080p
8−9
16−18
ultra / 1080p
7−8
14−16
4K / 2160p
3−4
6−7
low / 720p
18−20
35−40
medium / 1080p
8−9
18−20
The average gaming FPS of Radeon HD 6990M in Far Cry 5 is 111% more, than Mobility Radeon HD 3870 X2.
high / 1080p
14−16
24−27
ultra / 1080p
10−11
18−20
QHD / 1440p
−
16−18
low / 720p
60−65
95−100
medium / 1080p
21−24
50−55
The average gaming FPS of Radeon HD 6990M in Fortnite is 77% more, than Mobility Radeon HD 3870 X2.
high / 1080p
12−14
24−27
ultra / 1080p
10−12
18−20
QHD / 1440p
1−2
8−9
low / 720p
24−27
50−55
medium / 1080p
14−16
27−30
The average gaming FPS of Radeon HD 6990M in Forza Horizon 4 is 100% more, than Mobility Radeon HD 3870 X2.
low / 768p
50−55
80−85
medium / 768p
45−50
70−75
high / 1080p
12−14
27−30
ultra / 1080p
6−7
10−12
QHD / 1440p
0−1
2−3
The average gaming FPS of Radeon HD 6990M in Grand Theft Auto V is 65% more, than Mobility Radeon HD 3870 X2.
high / 1080p
4−5
9−10
ultra / 1080p
3−4
7−8
4K / 2160p
0−1
2−3
low / 720p
12−14
27−30
medium / 1080p
6−7
12−14
The average gaming FPS of Radeon HD 6990M in Metro Exodus is 133% more, than Mobility Radeon HD 3870 X2.
low / 768p
95−100
110−120
high / 1080p
85−90
−
ultra / 1080p
80−85
100−110
medium / 1080p
90−95
100−110
The average gaming FPS of Radeon HD 6990M in Minecraft is 20% more, than Mobility Radeon HD 3870 X2.
high / 1080p
16−18
21−24
ultra / 1080p
14−16
16−18
low / 720p
30−35
55−60
medium / 1080p
18−20
24−27
The average gaming FPS of Radeon HD 6990M in PLAYERUNKNOWN'S BATTLEGROUNDS is 50% more, than Mobility Radeon HD 3870 X2.
high / 1080p
−
14−16
ultra / 1080p
7−8
9−10
QHD / 1440p
0−1
0−1
low / 720p
12−14
27−30
medium / 1080p
10−12
16−18
The average gaming FPS of Radeon HD 6990M in Red Dead Redemption 2 is 80% more, than Mobility Radeon HD 3870 X2.
low / 768p
24−27
50−55
medium / 768p
16−18
30−35
high / 1080p
9−10
18−20
ultra / 1080p
6−7
10−11
4K / 2160p
6−7
8−9
The average gaming FPS of Radeon HD 6990M in The Witcher 3: Wild Hunt is 84% more, than Mobility Radeon HD 3870 X2.
low / 768p
85−90
100−105
medium / 768p
45−50
60−65
ultra / 1080p
18−20
30−35
high / 768p
35−40
50−55
The average gaming FPS of Radeon HD 6990M in World of Tanks is 31% more, than Mobility Radeon HD 3870 X2.
Full Specs
Mobility Radeon HD 3870 X2
Radeon HD 6990M
Architecture
RV6xx
Terascale 2
Code name
M88-XT CF
Blackcomb XTX
Type
Laptop
Laptop
Release date
1 September 2008
12 July 2011
Pipelines
640
1120
Core clock speed
660 MHz
715 MHz
Transistor count
666 million
1,700 million
Manufacturing process technology
55 nm
40 nm
Texture fill rate
10.56
40.04
Floating-point performance
2x 422.4 gflops
1,601.6 gflops
Memory bus width
256 Bit
256 Bit
Memory clock speed
850 MHz
900 MHz
Memory bandwidth
54.4 GB/s
115.2 GB/s
Shared memory
-
-
DirectX
10.1 (10_1)
11.2 (11_0)
Shader Model
4.1
5.0
OpenGL
3.3
4.4
OpenCL
N/A
1.2
Vulkan
N/A
N/A
Laptop size
large
large
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