Radeon R9 270 1024SP and GeForce GTX 645 OEM - video card comparison
Radeon R9 270 1024SP
GeForce GTX 645 OEM
Architecture
GCN 1.0 (2012−2020)
Kepler (2012−2018)
GPU code name
Pitcairn
GK106
Market segment
Desktop
Desktop
Release date
March 2015
April 2013
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
1x 6-pin
None
Boost clock speed
925 MHz
-
Core clock speed
900 MHz
824 MHz
Floating-point performance
1,894 gflops
949.2 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
2,800 million
2,540 million
Pipelines / CUDA cores
1024
576
Power consumption (TDP)
150 Watt
65 Watt
Texture fill rate
59.20
39.55
Memory type
GDDR5
GDDR5
Maximum RAM amount
2 GB
1 GB
Memory bus width
256 Bit
128 Bit
Memory clock speed
4800 MHz
4000 MHz
Memory bandwidth
153.6 GB/s
64 GB/s
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
1x DVI, 1x HDMI, 1x DisplayPort
HDMI
+
+
DirectX
12 (11_1)
12 (11_0)
CUDA
-
3.0
OpenCL
1.2
1.2
OpenGL
4.6
4.6
Shader Model
5.1
5.1
Vulkan
1.2.131
1.1.126