Radeon R9 280 and GeForce GT 640 OEM Rebrand - video card comparison
Radeon R9 280
GeForce GT 640 OEM Rebrand
Architecture
GCN 1.0 (2012−2020)
Fermi 2.0 (2010−2014)
GPU code name
Tahiti
GF116
Market segment
Desktop
Desktop
Release date
March 2014
April 2012
Bus support
PCIe 3.0
-
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
1 x 6-pin + 1 x 8-pin
None
Boost clock speed
933 MHz
-
Core clock speed
-
720 MHz
Floating-point performance
3,344 gflops
414.7 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
4,313 million
1,170 million
Pipelines / CUDA cores
1792
144
Power consumption (TDP)
200 Watt
75 Watt
Texture fill rate
104.5
17.28
Memory type
GDDR5
DDR3
Maximum RAM amount
3 GB
1536 MB
Memory bus width
384 Bit
192 Bit
Memory clock speed
1250 MHz
1600 MHz
Memory bandwidth
240 GB/s
38.4 GB/s
Display Connectors
2x DVI, 1x HDMI, 2x mini-DisplayPort
2x DVI, 1x mini-HDMI
Eyefinity
1
-
HDMI
+
+
DisplayPort support
-
-
DirectX
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
-
DDMA audio
+
-
Enduro
-
-
FreeSync
1
-
HD3D
+
-
LiquidVR
1
-
PowerTune
-
-
TressFX
1
-
TrueAudio
+
-
UVD
+
-
ZeroCore
-
-