GPU Comparison
RADEON
AMD Radeon HD 6950
CORE STATE
Cayman
VRAM
2 GB
CLOCK SPEED
—
TDP
200 W
BUS WIDTH
256 bit
ARCHITECTURE
TeraScale 3
PROCESS
40 nm
LAUNCH DATE
2010
VS
GEFORCE
GeForce GTX 660 Ti
CORE STATE
GK104
VRAM
2 GB
CLOCK SPEED
980 MHz
TDP
150 W
BUS WIDTH
192 bit
ARCHITECTURE
Kepler
PROCESS
28 nm
LAUNCH DATE
2012
PERFORMANCE BENCHMARKS
geekbench_opencl
geekbench_vulkan
DETAILED SPECIFICATIONS
SPECIFICATION
HD 6950
GTX 660 Ti
Core Specs
Shading Units
1,408
1,344
-4.5%
Shaders
1,408
1,344
-4.5%
TMUs
88
112
+27.3%
ROPs
32
24
-25.0%
Compute Units
22
—
Clocks
Base Clock
—
915 MHz
Boost Clock
—
980 MHz
GPU Clock
800 MHz
—
Memory Clock
1250 MHz
5 Gbps effective
1502 MHz
6 Gbps effective
Memory
Memory Size
2 GB
2 GB
VRAM (MB)
2,048
2,048
0.0%
Memory Type
GDDR5
GDDR5
Memory Bus
256 bit
192 bit
Bandwidth
160.0 GB/s
144.2 GB/s
Cache
L1 Cache
8 KB (per CU)
16 KB (per SMX)
L2 Cache
512 KB
384 KB
Performance
Pixel Rate
25.60 GPixel/s
27.44 GPixel/s
Texture Rate
70.40 GTexel/s
109.8 GTexel/s
FP32 (TFLOPS)
2.253 TFLOPS
2.634 TFLOPS
FP64 (TFLOPS)
563.2 GFLOPS (1:4)
109.8 GFLOPS (1:24)
Power
TDP
200 W
150 W
TDP (W)
200
150
-25.0%
Suggested PSU
550 W
450 W
Power Connectors
2x 6-pin
2x 6-pin
Architecture
Architecture
TeraScale 3
Kepler
GPU Name
Cayman
GK104
Generation
Northern Islands
(HD 6900)
GeForce 600
Process Size
40 nm
28 nm
Transistors
2,640 million
3,540 million
Die Size
389 mm²
294 mm²
Foundry
TSMC
TSMC
Density
6.8M / mm²
12.0M / mm²
API Support
DirectX
11.2 (11_0)
12 (11_0)
OpenGL
4.4
4.6
Vulkan
—
1.2.175
OpenCL
1.2
3.0
CUDA
—
3.0
Shader Model
5.0
6.5 (5.1)
Physical
Slot Width
Dual-slot
Dual-slot
Length
286 mm
11.3 inches
241 mm
9.5 inches
Height
126 mm
5 inches
—
Outputs
2x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
Bus Interface
PCIe 2.0 x16
PCIe 3.0 x16
Other
Launch Price
299 USD
299 USD
Production
End-of-life
End-of-life
Predecessor
Evergreen
GeForce 500
Successor
Southern Islands
GeForce 700