GeForce GTX 660 OEM and Radeon HD 7870 - video card comparison
GeForce GTX 660 OEM
Radeon HD 7870
Architecture
Kepler (2012−2018)
GCN (2011−2017)
GPU code name
GK104
Pitcairn XT
Market segment
Desktop
Desktop
Release date
August 2012
March 2012
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
1x 6-pin
2x 6-pin
Boost clock speed
888 MHz
-
Core clock speed
823 MHz
1000 MHz
Floating-point performance
2,046 gflops
-
Manufacturing process technology
28 nm
28 nm
Number of transistors
3,540 million
2800 Million
Pipelines / CUDA cores
1152
1280
Power consumption (TDP)
130 Watt
175 Watt
Texture fill rate
85.25
80.00
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
256 Bit
256 Bit
Memory clock speed
5600 MHz
4800 MHz
Memory bandwidth
179.2 GB/s
153.6 GB/s
Shared memory
-
-
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
1x DVI, 1x HDMI, 2x mini-DisplayPort
Eyefinity
-
+
HDMI
+
+
DirectX
12 (11_0)
12 (11_1)
CUDA
3.0
-
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.2.131