GeForce GTX 660 OEM and Radeon HD 6850 1440SP Edition - video card comparison
GeForce GTX 660 OEM
Radeon HD 6850 1440SP Edition
Architecture
Kepler (2012−2018)
TeraScale 2 (2009−2015)
GPU code name
GK104
Cypress
Market segment
Desktop
Desktop
Release date
August 2012
August 2012
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
1x 6-pin
2x 6-pin
Boost clock speed
888 MHz
-
Core clock speed
823 MHz
725 MHz
Floating-point performance
2,046 gflops
2,088 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
3,540 million
2,154 million
Pipelines / CUDA cores
1152
1440
Power consumption (TDP)
130 Watt
151 Watt
Texture fill rate
85.25
52.20
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
1 GB
Memory bus width
256 Bit
256 Bit
Memory clock speed
5600 MHz
4000 MHz
Memory bandwidth
179.2 GB/s
128.0 GB/s
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
2x DVI, 1x HDMI, 1x DisplayPort
HDMI
+
+
DirectX
12 (11_0)
11.2 (11_0)
CUDA
3.0
-
OpenCL
1.2
1.2
OpenGL
4.6
4.4
Shader Model
5.1
5.0
Vulkan
1.1.126
N/A