Radeon HD 6850 X2 vs Radeon HD 7990
If you are going to buy a new graphics card and are choosing between Radeon HD 6850 X2 and Radeon HD 7990, 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 Radeon HD 6850 X2 stacks up against Radeon HD 7990, check out specs charts below.
Radeon HD 6850 X2
Main Specs
Radeon HD 6850 X2
Radeon HD 7990
Power consumption (TDP)
254 Watt
375 Watt
Interface
PCIe 2.0 x16
PCIe 3.0 x16
Supplementary power connectors
2x 8-pin
2x 8-pin
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
3 GB
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
1x DVI, 4x mini-DisplayPort
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Radeon HD 7990 has 47% more power consumption, than Radeon HD 6850 X2.
Radeon HD 6850 X2 is connected by PCIe 2.0 x16, and Radeon HD 7990 uses PCIe 3.0 x16 interface.
Radeon HD 7990 has 1 GB more memory, than Radeon HD 6850 X2.
Both cards are used in Desktops.
Radeon HD 6850 X2 is build with TeraScale 2 architecture, and Radeon HD 7990 - with GCN 1.0.
Core clock speed of Radeon HD 7990 is 150 MHz higher, than Radeon HD 6850 X2.
Radeon HD 6850 X2 is manufactured by 40 nm process technology, and Radeon HD 7990 - by 28 nm process technology.
Memory clock speed of Radeon HD 7990 is 1800 MHz higher, than Radeon HD 6850 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
12−14
35−40
ultra / 1080p
7−8
21−24
QHD / 1440p
2−3
16−18
4K / 2160p
−
10−11
low / 720p
27−30
60−65
medium / 1080p
16−18
40−45
The average gaming FPS of Radeon HD 7990 in Assassin's Creed Odyssey is 176% more, than Radeon HD 6850 X2.
high / 1080p
21−24
55−60
ultra / 1080p
18−20
45−50
QHD / 1440p
4−5
35−40
4K / 2160p
−
18−20
low / 720p
45−50
100−110
medium / 1080p
21−24
60−65
The average gaming FPS of Radeon HD 7990 in Battlefield 5 is 169% more, than Radeon HD 6850 X2.
low / 768p
45−50
50−55
QHD / 1440p
0−1
0−1
The average gaming FPS of Radeon HD 7990 in Call of Duty: Warzone is 10% more, than Radeon HD 6850 X2.
low / 768p
190−200
250−260
medium / 768p
160−170
220−230
ultra / 1080p
85−90
180−190
QHD / 1440p
45−50
110−120
4K / 2160p
30−33
70−75
high / 768p
120−130
210−220
The average gaming FPS of Radeon HD 7990 in Counter-Strike: Global Offensive is 63% more, than Radeon HD 6850 X2.
low / 768p
55−60
60−65
ultra / 1080p
35−40
−
medium / 1080p
45−50
55−60
The average gaming FPS of Radeon HD 7990 in Cyberpunk 2077 is 15% more, than Radeon HD 6850 X2.
low / 768p
100−110
120−130
medium / 768p
85−90
110−120
ultra / 1080p
55−60
100−110
The average gaming FPS of Radeon HD 7990 in Dota 2 is 38% more, than Radeon HD 6850 X2.
high / 1080p
14−16
45−50
ultra / 1080p
14−16
40−45
QHD / 1440p
−
27−30
4K / 2160p
5−6
14−16
low / 720p
30−35
80−85
medium / 1080p
16−18
45−50
The average gaming FPS of Radeon HD 7990 in Far Cry 5 is 176% more, than Radeon HD 6850 X2.
high / 1080p
21−24
60−65
ultra / 1080p
16−18
45−50
QHD / 1440p
16−18
27−30
4K / 2160p
−
27−30
low / 720p
85−90
180−190
medium / 1080p
45−50
110−120
The average gaming FPS of Radeon HD 7990 in Fortnite is 128% more, than Radeon HD 6850 X2.
high / 1080p
21−24
60−65
ultra / 1080p
16−18
45−50
QHD / 1440p
7−8
30−35
4K / 2160p
−
24−27
low / 720p
45−50
100−110
medium / 1080p
24−27
65−70
The average gaming FPS of Radeon HD 7990 in Forza Horizon 4 is 162% more, than Radeon HD 6850 X2.
low / 768p
75−80
140−150
medium / 768p
65−70
120−130
high / 1080p
24−27
70−75
ultra / 1080p
10−11
30−35
QHD / 1440p
1−2
21−24
The average gaming FPS of Radeon HD 7990 in Grand Theft Auto V is 119% more, than Radeon HD 6850 X2.
high / 1080p
8−9
24−27
ultra / 1080p
6−7
20−22
QHD / 1440p
−
16−18
4K / 2160p
2−3
8−9
low / 720p
24−27
65−70
medium / 1080p
10−12
30−35
The average gaming FPS of Radeon HD 7990 in Metro Exodus is 210% more, than Radeon HD 6850 X2.
low / 768p
100−110
130−140
ultra / 1080p
95−100
−
medium / 1080p
100−110
120−130
The average gaming FPS of Radeon HD 7990 in Minecraft is 23% more, than Radeon HD 6850 X2.
high / 1080p
21−24
−
ultra / 1080p
16−18
14−16
low / 720p
50−55
100−110
medium / 1080p
21−24
18−20
The average gaming FPS of Radeon HD 7990 in PLAYERUNKNOWN'S BATTLEGROUNDS is 53% more, than Radeon HD 6850 X2.
high / 1080p
12−14
24−27
ultra / 1080p
9−10
16−18
QHD / 1440p
0−1
10−11
4K / 2160p
−
7−8
low / 720p
24−27
65−70
medium / 1080p
14−16
35−40
The average gaming FPS of Radeon HD 7990 in Red Dead Redemption 2 is 140% more, than Radeon HD 6850 X2.
low / 768p
45−50
130−140
medium / 768p
27−30
85−90
high / 1080p
16−18
45−50
ultra / 1080p
9−10
24−27
4K / 2160p
7−8
16−18
The average gaming FPS of Radeon HD 7990 in The Witcher 3: Wild Hunt is 181% more, than Radeon HD 6850 X2.
low / 768p
95−100
90−95
medium / 768p
55−60
60−65
ultra / 1080p
30−35
50−55
high / 768p
50−55
60−65
The average gaming FPS of Radeon HD 7990 in World of Tanks is 11% more, than Radeon HD 6850 X2.
Full Specs
Radeon HD 6850 X2
Radeon HD 7990
Architecture
TeraScale 2
GCN 1.0
Code name
Barts
Malta
Type
Desktop
Desktop
Release date
19 September 2011
24 April 2013
Pipelines
960
2048
Core clock speed
800 MHz
950 MHz
Boost Clock
1000 MHz
Transistor count
1,700 million
4,313 million
Manufacturing process technology
40 nm
28 nm
Texture fill rate
38.40
128.0
Floating-point performance
2x 1,536.0 gflops
2x 4,096 gflops
Length
307 mm
Memory bus width
256 Bit
384 Bit
Memory clock speed
4200 MHz
6000 MHz
Memory bandwidth
134.4 GB/s
288.0 GB/s
DirectX
11.2 (11_0)
12 (11_1)
Shader Model
5.0
5.1
OpenGL
4.4
4.6
OpenCL
1.2
1.2
Vulkan
N/A
1.2.131
Bitcoin / BTC (SHA256)
459 Mh/s
Ethereum / ETH (DaggerHashimoto)
44 Mh/s
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