GPU Comparison
RADEON
AMD Radeon HD 7950
CORE STATE
Tahiti
VRAM
3 GB
CLOCK SPEED
—
TDP
200 W
BUS WIDTH
384 bit
ARCHITECTURE
GCN 1.0
PROCESS
28 nm
LAUNCH DATE
2012
VS
GEFORCE
GeForce GTX 660
CORE STATE
GK106
VRAM
2 GB
CLOCK SPEED
1032 MHz
TDP
140 W
BUS WIDTH
192 bit
ARCHITECTURE
Kepler
PROCESS
28 nm
LAUNCH DATE
2012
PERFORMANCE BENCHMARKS
geekbench_metal
geekbench_opencl
geekbench_vulkan
DETAILED SPECIFICATIONS
SPECIFICATION
HD 7950
GTX 660
Core Specs
Shading Units
1,792
960
-46.4%
Shaders
1,792
960
-46.4%
TMUs
112
80
-28.6%
ROPs
32
24
-25.0%
Compute Units
28
—
Clocks
Base Clock
—
980 MHz
Boost Clock
—
1032 MHz
GPU Clock
800 MHz
—
Memory Clock
1250 MHz
5 Gbps effective
1502 MHz
6 Gbps effective
Memory
Memory Size
3 GB
2 GB
VRAM (MB)
3,072
2,048
-33.3%
Memory Type
GDDR5
GDDR5
Memory Bus
384 bit
192 bit
Bandwidth
240.0 GB/s
144.2 GB/s
Cache
L1 Cache
16 KB (per CU)
16 KB (per SMX)
L2 Cache
768 KB
384 KB
Performance
Pixel Rate
25.60 GPixel/s
20.64 GPixel/s
Texture Rate
89.60 GTexel/s
82.56 GTexel/s
FP32 (TFLOPS)
2.867 TFLOPS
1.981 TFLOPS
FP64 (TFLOPS)
716.8 GFLOPS (1:4)
82.56 GFLOPS (1:24)
Power
TDP
200 W
140 W
TDP (W)
200
140
-30.0%
Suggested PSU
550 W
300 W
Power Connectors
2x 6-pin
1x 6-pin
Architecture
Architecture
GCN 1.0
Kepler
GPU Name
Tahiti
GK106
Generation
Southern Islands
(HD 7900)
GeForce 600
Process Size
28 nm
28 nm
Transistors
4,313 million
2,540 million
Die Size
352 mm²
221 mm²
Foundry
TSMC
TSMC
Density
12.3M / mm²
11.5M / mm²
API Support
DirectX
12 (11_1)
12 (11_0)
OpenGL
4.6
4.6
Vulkan
1.2.170
1.2.175
OpenCL
2.1 (1.2)
3.0
CUDA
—
3.0
Shader Model
6.5 (5.1)
6.5 (5.1)
Physical
Slot Width
Dual-slot
Dual-slot
Length
278 mm
10.9 inches
241 mm
9.5 inches
Height
111 mm
4.4 inches
—
Outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x16
Other
Launch Price
449 USD
229 USD
Production
End-of-life
End-of-life
Predecessor
Northern Islands
GeForce 500
Successor
Sea Islands
GeForce 700