GeForce GTX 980 and GeForce GT 640 - video card comparison
Passmark - benchmark score GeForce GTX 980 vs GeForce GT 640
GeForce GTX 980
11458
GeForce GT 640
1209
GeForce GTX 980
GeForce GT 640
Architecture
Maxwell (2014−2018)
Kepler (2012−2018)
GPU code name
GM204
GK107
Market segment
Desktop
Desktop
Release date
September 2014
June 2012
Bus support
PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Recommended system power (PSU)
500 Watt
-
Supplementary power connectors
2x 6-pins
None
SLI options
+
-
Boost clock speed
1216 MHz
-
Core clock speed
1064 MHz
902 MHz
CUDA cores
2048
-
Floating-point performance
4,981 gflops
692.7 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
5,200 million
1,270 million
Pipelines / CUDA cores
2048
384
Power consumption (TDP)
165 Watt
65 Watt
Texture fill rate
144 billion/sec
28.86
Memory type
GDDR5
DDR3
Maximum RAM amount
4 GB
2 GB
Memory bus width
256 Bit
128 Bit
Memory clock speed
7.0 GB/s
1782 MHz
Memory bandwidth
224 GB/s
28.51 GB/s
Shared memory
-
-
Display Connectors
Dual Link DVI-I, HDMI 2.0, 3x DisplayPort 1.2
1x DVI, 1x HDMI, 1x DisplayPort
Multi monitor support
4 displays
-
VGA аnalog display support
+
-
DisplayPort Multimode (DP++) support
+
-
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
2048x1536
-
G-SYNC support
+
-
Audio input for HDMI
Internal
-
DirectX
12 (12_1)
12 (11_0)
CUDA
+
3.0
OpenCL
1.2
1.2
OpenGL
4.5
4.6
Shader Model
6.4
5.1
Vulkan
1.1.126
1.1.126
BatteryBoost
+
-
GameStream
+
-
GameWorks
+
-
GeForce ShadowPlay
+
-
GPU Boost
2.0
-
H.264, VC1, MPEG2 1080p video decoder
+
-
Optimus
+
-