Radeon HD 7990 and Radeon HD 6450 - video card comparison
Passmark - benchmark score Radeon HD 7990 vs Radeon HD 6450
Radeon HD 7990
5732
Radeon HD 6450
203
Radeon HD 7990
Radeon HD 6450
Architecture
GCN 1.0 (2012−2020)
TeraScale 2 (2009−2015)
GPU code name
Malta
Caicos
Market segment
Desktop
Desktop
Release date
April 2013
April 2011
Bus support
-
PCIe 2.0 x8
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
2x 8-pin
None
Boost clock speed
1000 MHz
750 MHz
Core clock speed
950 MHz
-
Floating-point performance
2x 4,096 gflops
200.0 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
4,313 million
370 million
Pipelines / CUDA cores
2048
160
Power consumption (TDP)
375 Watt
30 Watt
Texture fill rate
128.0
5.000
Memory type
GDDR5
GDDR5
Maximum RAM amount
3 GB
1 GB
Memory bus width
384 Bit
64 Bit
Memory clock speed
6000 MHz
800 MHz
Memory bandwidth
288.0 GB/s
25.6 GB/s
Memory bandwidth
-
8.5-12.8 GB/x (DDR3) or 25.6-28.8 GB/s (GDDR5)
Display Connectors
1x DVI, 4x mini-DisplayPort
1x DVI, 1x HDMI, 1x VGA
Eyefinity
-
1
Number of Eyefinity displays
-
4
HDMI
-
+
DisplayPort support
-
+
DirectX
12 (11_1)
DirectX® 11
Mantle
-
-
OpenCL
1.2
1.2
OpenGL
4.6
4.4
Shader Model
5.1
5.0
Vulkan
1.2.131
-
AppAcceleration
-
-
CrossFire
-
1
Enduro
-
-
HD3D
-
-
PowerTune
-
-
TrueAudio
-
-
ZeroCore
-
-