Radeon R9 390 and GeForce GT 640 OEM Rebrand - video card comparison
Radeon R9 390
GeForce GT 640 OEM Rebrand
Architecture
GCN 2.0 (2013−2017)
Fermi 2.0 (2010−2014)
GPU code name
Grenada
GF116
Market segment
Desktop
Desktop
Release date
June 2015
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
Bridgeless CrossFire
1
-
Boost clock speed
1000 MHz
-
Core clock speed
-
720 MHz
Floating-point performance
5,120 gflops
414.7 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
6,200 million
1,170 million
Pipelines / CUDA cores
2560
144
Power consumption (TDP)
275 Watt
75 Watt
Texture fill rate
160.0
17.28
Memory type
GDDR5
DDR3
Maximum RAM amount
0 MB
1536 MB
Memory bus width
512 Bit
192 Bit
Memory clock speed
1000 MHz
1600 MHz
Memory bandwidth
384 GB/s
38.4 GB/s
High bandwidth memory (HBM)
-
-
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
2x DVI, 1x mini-HDMI
Eyefinity
1
-
Number of Eyefinity displays
6
-
HDMI
+
+
DisplayPort support
+
-
DirectX
DirectX® 12
12 (11_0)
CUDA
-
2.1
Mantle
+
-
OpenCL
2.0
1.1
OpenGL
4.6
4.6
Shader Model
6.3
5.1
Vulkan
+
N/A
AppAcceleration
-
-
CrossFire
1
-
DDMA audio
+
-
Enduro
-
-
FreeSync
1
-
HD3D
-
-
PowerTune
+
-
TrueAudio
+
-
VCE
+
-
ZeroCore
-
-