AMD Radeon HD 6850 X2 vs AMD Radeon HD 7990
GPU Specs Compare
Graphics Card
Release Date
Sep 2011
Apr 2013
Generation
Northern Islands
Southern Islands
Type
Desktop
Desktop
Bus Interface
PCIe 2.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1050 MHz
1500 MHz
Base Clock
-
950 MHz
Boost Clock
-
1000 MHz
Memory
Memory Size
2GB
3GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
384bit
Bandwidth
134.4GB/s
288.0GB/s
Render Config
Compute Units
12
32
Shading Units
960
2048
TMUs
48
128
ROPs
32
32
L1 Cache
8 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
768 KB
Theoretical Performance
Pixel Rate
25.60 GPixel/s
32.00 GPixel/s
Texture Rate
38.40 GTexel/s
128.0 GTexel/s
FP32 (float)
1.536 TFLOPS
4.096 TFLOPS
FP64 (double)
-
1024 GFLOPS
Graphics Processor
GPU Name
Barts
Malta
GPU Variant
Barts PRO(215-0798006)
Malta XT(215-0849026)
Architecture
TeraScale 2
GCN 1.0
Foundry
TSMC
TSMC
Process Size
40 nm
28 nm
Transistors
1.7 billion
4.313 billion
Die Size
255 mm²
365 mm²
Board Design
TDP
254W
375W
Suggested PSU
600 W
750 W
Outputs
2x DVI1x HDMI 1.3a1x DisplayPort 1.1
1x DVI4x mini-DisplayPort 1.2
Power Connectors
2x 8-pin
2x 8-pin
Graphics Features
DirectX
11.2 (11_0)
12 (11_1)
OpenGL
4.4
4.6
OpenCL
1.2
1.2
Vulkan
N/A
1.2
Shader Model
5.0
5.1