GPU Comparison
RADEON
AMD Radeon HD 6850 X2
CORE STATE
Barts
VRAM
2 GB
CLOCK SPEED
—
TDP
254 W
BUS WIDTH
256 bit
ARCHITECTURE
TeraScale 2
PROCESS
40 nm
LAUNCH DATE
2011
VS
RADEON
Radeon HD 7970
CORE STATE
Tahiti
VRAM
3 GB
CLOCK SPEED
—
TDP
250 W
BUS WIDTH
384 bit
ARCHITECTURE
GCN 1.0
PROCESS
28 nm
LAUNCH DATE
2012
PERFORMANCE BENCHMARKS
geekbench_opencl
DETAILED SPECIFICATIONS
SPECIFICATION
HD 6850 X2
HD 7970
Core Specs
Shading Units
960
2,048
+113.3%
Shaders
960
2,048
+113.3%
TMUs
48
128
+166.7%
ROPs
32
32
0.0%
Compute Units
12
32
+166.7%
Clocks
GPU Clock
800 MHz
925 MHz
Memory Clock
1050 MHz
4.2 Gbps effective
1375 MHz
5.5 Gbps effective
Memory
Memory Size
2 GB
3 GB
VRAM (MB)
2,048
3,072
+50.0%
Memory Type
GDDR5
GDDR5
Memory Bus
256 bit
384 bit
Bandwidth
134.4 GB/s
264.0 GB/s
Cache
L1 Cache
8 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
768 KB
Performance
Pixel Rate
25.60 GPixel/s
29.60 GPixel/s
Texture Rate
38.40 GTexel/s
118.4 GTexel/s
FP32 (TFLOPS)
1.536 TFLOPS
3.789 TFLOPS
FP64 (TFLOPS)
—
947.2 GFLOPS (1:4)
Power
TDP
254 W
250 W
TDP (W)
254
250
-1.6%
Suggested PSU
600 W
600 W
Power Connectors
2x 8-pin
1x 6-pin + 1x 8-pin
Architecture
Architecture
TeraScale 2
GCN 1.0
GPU Name
Barts
Tahiti
Generation
Northern Islands
(HD 6800)
Southern Islands
(HD 7900)
Process Size
40 nm
28 nm
Transistors
1,700 million
4,313 million
Die Size
255 mm²
352 mm²
Foundry
TSMC
TSMC
Density
6.7M / mm²
12.3M / mm²
API Support
DirectX
11.2 (11_0)
12 (11_1)
OpenGL
4.4
4.6
Vulkan
—
1.2.170
OpenCL
1.2
2.1 (1.2)
Shader Model
5.0
6.5 (5.1)
Physical
Slot Width
Dual-slot
Dual-slot
Length
—
275 mm
10.8 inches
Height
—
111 mm
4.4 inches
Outputs
2x DVI1x HDMI 1.3a1x DisplayPort 1.1
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
Bus Interface
PCIe 2.0 x16
PCIe 3.0 x16
Other
Launch Price
—
549 USD
Production
End-of-life
End-of-life
Predecessor
Evergreen
Northern Islands
Successor
Southern Islands
Sea Islands