Radeon HD 7850 and GeForce GT 420 OEM - video card comparison
Radeon HD 7850
GeForce GT 420 OEM
Architecture
GCN 1.0 (2012−2020)
Fermi (2010−2014)
GPU code name
Pitcairn
GF108
Market segment
Desktop
Desktop
Release date
March 2012
September 2010
Bus support
PCIe 2.1 x16
-
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
1x 6-pin
None
Boost clock speed
1000 MHz
-
Core clock speed
-
700 MHz
Floating-point performance
1,761 gflops
134.4 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
2,800 million
585 million
Pipelines / CUDA cores
1024
48
Power consumption (TDP)
130 Watt
50 Watt
Texture fill rate
55.04
2.800
Memory type
GDDR5
DDR3
Maximum RAM amount
2 GB
1 GB
Memory bus width
256 Bit
128 Bit
Memory clock speed
1200 MHz
1800 MHz
Memory bandwidth
153.6 GB/s
28.8 GB/s
Display Connectors
1x DVI, 1x HDMI, 2x mini-DisplayPort
1x DVI, 1x HDMI, 1x VGA
Eyefinity
1
-
HDMI
+
+
DisplayPort support
-
-
DirectX
12
12 (11_0)
CUDA
-
2.1
Mantle
-
-
OpenCL
1.2
1.1
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
+
N/A
AppAcceleration
-
-
CrossFire
1
-
Enduro
-
-
FreeSync
1
-
HD3D
-
-
PowerTune
-
-
TrueAudio
-
-
ZeroCore
-
-