Radeon HD 7790 and GeForce GTX 645 OEM - video card comparison
Radeon HD 7790
GeForce GTX 645 OEM
Architecture
GCN 2.0 (2013−2017)
Kepler (2012−2018)
GPU code name
Bonaire
GK106
Market segment
Desktop
Desktop
Release date
March 2013
April 2013
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
1x 6-pin
None
Core clock speed
1000 MHz
824 MHz
Floating-point performance
1,792 gflops
949.2 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
2,080 million
2,540 million
Pipelines / CUDA cores
896
576
Power consumption (TDP)
85 Watt
65 Watt
Texture fill rate
56.00
39.55
Memory type
GDDR5
GDDR5
Maximum RAM amount
1 GB
1 GB
Memory bus width
128 Bit
128 Bit
Memory clock speed
6000 MHz
4000 MHz
Memory bandwidth
96 GB/s
64 GB/s
Display Connectors
1x DVI, 1x HDMI, 2x mini-DisplayPort
1x DVI, 1x HDMI, 1x DisplayPort
HDMI
+
+
DirectX
12 (12_0)
12 (11_0)
CUDA
-
3.0
OpenCL
2.0
1.2
OpenGL
4.6
4.6
Shader Model
6.3
5.1
Vulkan
1.2.131
1.1.126