NVIDIA GeForce GTX 660 Ti vs AMD Radeon HD 6870
GPU · Specs Compare
Graphics Card
Release Date
Aug 2012
Oct 2010
Generation
GeForce 600
Northern Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 2.0 x16
Clock Speeds
Base Clock
915 MHz
—
Boost Clock
980 MHz
—
Memory Clock
1502 MHz
1050 MHz
Memory
Memory Size
2GB
1024MB
Memory Type
GDDR5
GDDR5
Memory Bus
192bit
256bit
Bandwidth
144.2GB/s
134.4GB/s
Render Config
Shading Units
1344
1120
TMUs
112
56
ROPs
24
32
L1 Cache
16 KB (per SMX)
8 KB (per CU)
L2 Cache
384 KB
512 KB
Compute Units
—
14
Theoretical Performance
Pixel Rate
27.44 GPixel/s
28.80 GPixel/s
Texture Rate
109.8 GTexel/s
50.40 GTexel/s
FP32 (float)
2.634 TFLOPS
2.016 TFLOPS
FP64 (double)
109.8 GFLOPS
—
Graphics Processor
GPU Name
GK104
Barts
GPU Variant
GK104-300-KD-A2
Barts XT(215-0798000)
Architecture
Kepler
TeraScale 2
Foundry
TSMC
TSMC
Process Size
28 nm
40 nm
Transistors
3.54 billion
1.7 billion
Die Size
294 mm²
255 mm²
Board Design
TDP
150W
151W
Suggested PSU
450 W
450 W
Outputs
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
2x DVI1x HDMI 1.3a2x mini-DisplayPort 1.1
Power Connectors
2x 6-pin
2x 6-pin
Graphics Features
DirectX
12 (11_0)
11.2 (11_0)
OpenGL
4.6
4.4
OpenCL
3.0
1.2
Vulkan
1.1
N/A
CUDA
3.0
—
Shader Model
5.1
5.0
▲ Specs Compare
Data sourced from official specifications and benchmark tests.