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
GEFORCE
Quadro K620
CORE STATE
GM107
VRAM
2 GB
CLOCK SPEED
1124 MHz
TDP
45 W
BUS WIDTH
128 bit
ARCHITECTURE
Maxwell
PROCESS
28 nm
LAUNCH DATE
2014
PERFORMANCE BENCHMARKS
geekbench_opencl
geekbench_vulkan
DETAILED SPECIFICATIONS
SPECIFICATION
HD 6850 X2
Quadro K620
Core Specs
Shading Units
960
384
-60.0%
Shaders
960
384
-60.0%
TMUs
48
24
-50.0%
ROPs
32
16
-50.0%
Compute Units
12
—
Clocks
Base Clock
—
1058 MHz
Boost Clock
—
1124 MHz
GPU Clock
800 MHz
—
Memory Clock
1050 MHz
4.2 Gbps effective
900 MHz
1800 Mbps effective
Memory
Memory Size
2 GB
2 GB
VRAM (MB)
2,048
2,048
0.0%
Memory Type
GDDR5
DDR3
Memory Bus
256 bit
128 bit
Bandwidth
134.4 GB/s
28.80 GB/s
Cache
L1 Cache
8 KB (per CU)
64 KB (per SMM)
L2 Cache
512 KB
2 MB
Performance
Pixel Rate
25.60 GPixel/s
17.98 GPixel/s
Texture Rate
38.40 GTexel/s
26.98 GTexel/s
FP32 (TFLOPS)
1.536 TFLOPS
863.2 GFLOPS
FP64 (TFLOPS)
—
26.98 GFLOPS (1:32)
Power
TDP
254 W
45 W
TDP (W)
254
45
-82.3%
Suggested PSU
600 W
200 W
Power Connectors
2x 8-pin
None
Architecture
Architecture
TeraScale 2
Maxwell
GPU Name
Barts
GM107
Generation
Northern Islands
(HD 6800)
Quadro Kepler
(Kx200)
Process Size
40 nm
28 nm
Transistors
1,700 million
1,870 million
Die Size
255 mm²
148 mm²
Foundry
TSMC
TSMC
Density
6.7M / mm²
12.6M / mm²
API Support
DirectX
11.2 (11_0)
12 (11_0)
OpenGL
4.4
4.6
Vulkan
—
1.4
OpenCL
1.2
3.0
CUDA
—
5.0
Shader Model
5.0
6.7 (5.1)
Physical
Slot Width
Dual-slot
Single-slot
Length
—
160 mm
6.3 inches
Height
—
69 mm
2.7 inches
Outputs
2x DVI1x HDMI 1.3a1x DisplayPort 1.1
1x DVI1x DisplayPort 1.2
Bus Interface
PCIe 2.0 x16
PCIe 2.0 x16
Other
Production
End-of-life
End-of-life
Predecessor
Evergreen
Quadro Fermi
Successor
Southern Islands
Quadro Maxwell