Radeon HD 7770 and GeForce GTX 660 Rev. 2 - video card comparison
Radeon HD 7770
GeForce GTX 660 Rev. 2
Architecture
GCN (2011−2017)
Kepler (2012−2018)
GPU code name
Cape Verde
GK104
Market segment
Desktop
Desktop
Release date
February 2012
September 2014
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
1x 6-pin
1x 6-pin
Boost clock speed
-
1032 MHz
Core clock speed
1000 MHz
980 MHz
Floating-point performance
-
1,981 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,500 million
3,540 million
Pipelines / CUDA cores
640
960
Power consumption (TDP)
80 Watt
140 Watt
Texture fill rate
40.00
82.56
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
2 GB
Memory bus width
128 Bit
192 Bit
Memory clock speed
4500 MHz
6008 MHz
Memory bandwidth
72 GB/s
144.2 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 2x mini-DisplayPort
2x DVI, 1x HDMI, 1x DisplayPort
Eyefinity
+
-
HDMI
+
+
DirectX
12 (11_1)
12 (11_0)
CUDA
-
3.0
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.2.131
1.1.126