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 K4000
CORE STATE
GK106
VRAM
3 GB
CLOCK SPEED
—
TDP
80 W
BUS WIDTH
192 bit
ARCHITECTURE
Kepler
PROCESS
28 nm
LAUNCH DATE
2013
PERFORMANCE BENCHMARKS
geekbench_opencl
geekbench_metal
geekbench_vulkan
DETAILED SPECIFICATIONS
SPECIFICATION
HD 6850 X2
Quadro K4000
Core Specs
Shading Units
960
768
-20.0%
Shaders
960
768
-20.0%
TMUs
48
64
+33.3%
ROPs
32
24
-25.0%
Compute Units
12
—
Clocks
GPU Clock
800 MHz
810 MHz
Memory Clock
1050 MHz
4.2 Gbps effective
1404 MHz
5.6 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
192 bit
Bandwidth
134.4 GB/s
134.8 GB/s
Cache
L1 Cache
8 KB (per CU)
16 KB (per SMX)
L2 Cache
512 KB
384 KB
Performance
Pixel Rate
25.60 GPixel/s
12.96 GPixel/s
Texture Rate
38.40 GTexel/s
51.84 GTexel/s
FP32 (TFLOPS)
1.536 TFLOPS
1,244.2 GFLOPS
FP64 (TFLOPS)
—
51.84 GFLOPS (1:24)
Power
TDP
254 W
80 W
TDP (W)
254
80
-68.5%
Suggested PSU
600 W
250 W
Power Connectors
2x 8-pin
1x 6-pin
Architecture
Architecture
TeraScale 2
Kepler
GPU Name
Barts
GK106
Generation
Northern Islands
(HD 6800)
Quadro Kepler
(Kx000)
Process Size
40 nm
28 nm
Transistors
1,700 million
2,540 million
Die Size
255 mm²
221 mm²
Foundry
TSMC
TSMC
Density
6.7M / mm²
11.5M / mm²
API Support
DirectX
11.2 (11_0)
12 (11_0)
OpenGL
4.4
4.6
Vulkan
—
1.2.175
OpenCL
1.2
3.0
CUDA
—
3.0
Shader Model
5.0
6.5 (5.1)
Physical
Slot Width
Dual-slot
Single-slot
Length
—
241 mm
9.5 inches
Height
—
111 mm
4.4 inches
Outputs
2x DVI1x HDMI 1.3a1x DisplayPort 1.1
1x DVI2x DisplayPort 1.2
Bus Interface
PCIe 2.0 x16
PCIe 2.0 x16
Other
Launch Price
—
1,269 USD
Production
End-of-life
End-of-life
Predecessor
Evergreen
Quadro Fermi
Successor
Southern Islands
Quadro Maxwell