GeForce GTX 645 OEM and Radeon Sky 900 - video card comparison
GeForce GTX 645 OEM
Radeon Sky 900
Architecture
Kepler (2012−2018)
GCN 1.0 (2012−2020)
GPU code name
GK106
Tahiti
Market segment
Desktop
Desktop
Release date
April 2013
March 2013
Bus support
-
PCIe 3.0
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
None
2x 8-pin
Boost clock speed
-
950 MHz
Core clock speed
824 MHz
825 MHz
Floating-point performance
949.2 gflops
2x 3,405 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
2,540 million
4,313 million
Pipelines / CUDA cores
576
3584
Power consumption (TDP)
65 Watt
300 Watt
Texture fill rate
39.55
106.4
Memory type
GDDR5
GDDR5
Maximum RAM amount
1 GB
6 GB
Memory bus width
128 Bit
384 Bit
Memory clock speed
4000 MHz
5000 MHz
Memory bandwidth
64 GB/s
480 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
1x DVI, 1x mini-DisplayPort
Dual-link DVI support
-
1
HDMI
+
-
DirectX
12 (11_0)
12 (11_1)
CUDA
3.0
-
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.1.126
1.2.131