Radeon HD 4870 and GeForce GTX 660 OEM - video card comparison
Radeon HD 4870
GeForce GTX 660 OEM
Architecture
TeraScale (2005−2013)
Kepler (2012−2018)
GPU code name
RV770
GK104
Market segment
Desktop
Desktop
Release date
June 2008
August 2012
Interface
PCIe 2.0 x16
PCIe 3.0 x16
Supplementary power connectors
2x 6-pin
1x 6-pin
Boost clock speed
-
888 MHz
Core clock speed
750 MHz
823 MHz
Floating-point performance
1,200.0 gflops
2,046 gflops
Manufacturing process technology
55 nm
28 nm
Number of transistors
956 million
3,540 million
Pipelines / CUDA cores
800
1152
Power consumption (TDP)
150 Watt
130 Watt
Texture fill rate
30.00
85.25
Memory type
GDDR5
GDDR5
Maximum RAM amount
1 GB
2 GB
Memory bus width
256 Bit
256 Bit
Memory clock speed
3600 MHz
5600 MHz
Memory bandwidth
115.2 GB/s
179.2 GB/s
Display Connectors
2x DVI, 1x S-Video
2x DVI, 1x HDMI, 1x DisplayPort
HDMI
-
+
DirectX
10.1 (10_1)
12 (11_0)
CUDA
-
3.0
OpenCL
1.1
1.2
OpenGL
3.3
4.6
Shader Model
4.1
5.1
Vulkan
N/A
1.1.126