Radeon HD 7770 and GeForce GT 640 - video card comparison
Passmark - benchmark score Radeon HD 7770 vs GeForce GT 640
Radeon HD 7770
2235
GeForce GT 640
1209
Radeon HD 7770
GeForce GT 640
Architecture
GCN (2011−2017)
Kepler (2012−2018)
GPU code name
Cape Verde
GK107
Market segment
Desktop
Desktop
Release date
February 2012
June 2012
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
1x 6-pin
None
Core clock speed
1000 MHz
902 MHz
Floating-point performance
-
692.7 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,500 million
1,270 million
Pipelines / CUDA cores
640
384
Power consumption (TDP)
80 Watt
65 Watt
Texture fill rate
40.00
28.86
Memory type
GDDR5
DDR3
Maximum RAM amount
2 GB
2 GB
Memory bus width
128 Bit
128 Bit
Memory clock speed
4500 MHz
1782 MHz
Memory bandwidth
72 GB/s
28.51 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 2x mini-DisplayPort
1x 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