GeForce GTX 1080 Ti and GeForce GT 640 Rev. 2 - video card comparison
GeForce GTX 1080 Ti
GeForce GT 640 Rev. 2
Architecture
Pascal (2016−2021)
Kepler 2.0 (2013−2015)
GPU code name
GP102
GK208
Market segment
Desktop
Desktop
Release date
February 2017
May 2013
Interface
PCIe 3.0 x16
PCIe 2.0 x8
Recommended system power (PSU)
600 Watt
-
Supplementary power connectors
1x 6-pin + 1x 8-pin
None
SLI options
+
-
Boost clock speed
1600 MHz
-
Core clock speed
1481 MHz
1046 MHz
Floating-point performance
11,340 gflops
803.3 gflops
Manufacturing process technology
16 nm
28 nm
Number of transistors
11,800 million
915 million
Pipelines / CUDA cores
3584
384
Power consumption (TDP)
250 Watt
49 Watt
Maximum GPU temperature
91 °C
-
Texture fill rate
354.4
33.47
Memory type
GDDR5X
GDDR5
Maximum RAM amount
11 GB
1 GB
Memory bus width
352 Bit
64 Bit
Memory clock speed
11000 MHz
5008 MHz
Memory bandwidth
484.4 GB/s
40.06 GB/s
Shared memory
-
-
Display Connectors
1x HDMI, 3x DisplayPort
1x DVI, 1x HDMI, 1x VGA
Multi monitor support
+
-
HDMI
+
+
G-SYNC support
+
-
DirectX
12 (12_1)
12 (11_0)
CUDA
+
3.5
OpenCL
1.2
1.2
OpenGL
4.5
4.6
Shader Model
6.4
5.1
Vulkan
+
1.1.126
Ansel
+
-
GPU Boost
3.0
-