Radeon HD 4890 and GeForce GT 640 OEM Rebrand - video card comparison
Radeon HD 4890
GeForce GT 640 OEM Rebrand
Architecture
TeraScale (2005−2013)
Fermi 2.0 (2010−2014)
GPU code name
RV790
GF116
Market segment
Desktop
Desktop
Release date
April 2009
April 2012
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Supplementary power connectors
2x 6-pin
None
Core clock speed
850 MHz
720 MHz
Floating-point performance
1,360.0 gflops
414.7 gflops
Manufacturing process technology
55 nm
40 nm
Number of transistors
959 million
1,170 million
Pipelines / CUDA cores
800
144
Power consumption (TDP)
190 Watt
75 Watt
Texture fill rate
34.00
17.28
Memory type
GDDR5
DDR3
Maximum RAM amount
1 GB
1536 MB
Memory bus width
256 Bit
192 Bit
Memory clock speed
3900 MHz
1600 MHz
Memory bandwidth
124.8 GB/s
38.4 GB/s
Display Connectors
2x DVI, 1x S-Video
2x DVI, 1x mini-HDMI
HDMI
-
+
DirectX
10.1 (10_1)
12 (11_0)
CUDA
-
2.1
OpenCL
1.1
1.1
OpenGL
3.3
4.6
Shader Model
4.1
5.1
Vulkan
N/A
N/A