Radeon HD 4850 and GeForce GT 640 OEM Rebrand - video card comparison
Radeon HD 4850
GeForce GT 640 OEM Rebrand
Architecture
Terascale 1 (2008−2010)
Fermi 2.0 (2010−2014)
GPU code name
RV770
GF116
Market segment
Desktop
Desktop
Release date
June 2008
April 2012
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Supplementary power connectors
1x 6-pin
None
Core clock speed
625 MHz
720 MHz
Floating-point performance
1,000.0 gflops
414.7 gflops
Manufacturing process technology
55 nm
40 nm
Number of transistors
956 million
1,170 million
Pipelines / CUDA cores
800
144
Power consumption (TDP)
110 Watt
75 Watt
Texture fill rate
25.00
17.28
Memory type
GDDR3
DDR3
Maximum RAM amount
512 MB
1536 MB
Memory bus width
256 Bit
192 Bit
Memory clock speed
993 MHz
1600 MHz
Memory bandwidth
63.55 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