AMD Radeon HD 7870 XT vs NVIDIA GeForce GTX 660

VS

AMD Radeon HD 7870 XT

NVIDIA GeForce GTX 660

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 7870 XT and 2GB VRAM GeForce GTX 660 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7870 XT 's Advantages

Larger VRAM bandwidth (192.0GB/s vs 144.2GB/s)

576 additional rendering cores

NVIDIA GeForce GTX 660 's Advantages

Boost Clock has increased by 6% (1032MHz vs 975MHz)

Lower TDP (140W vs 185W)

Score

Benchmark

FP32 (float)

Radeon HD 7870 XT +51%

2.995 TFLOPS

GeForce GTX 660

1.981 TFLOPS

Radeon HD 7870 XT

VS

GeForce GTX 660

Graphics Card

Nov 2012

Release Date

Sep 2012

Southern Islands

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

925 MHz

Base Clock

980 MHz

975 MHz

Boost Clock

1032 MHz

1500 MHz

Memory Clock

1502 MHz

Memory

2GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

192bit

192.0GB/s

Bandwidth

144.2GB/s

Render Config

24

Compute Units

-

1536

Shading Units

960

96

TMUs

80

32

ROPs

24

-

16 KB (per CU)

L1 Cache

16 KB (per SMX)

512 KB

L2 Cache

384 KB

-

Theoretical Performance

31.20 GPixel/s

Pixel Rate

20.64 GPixel/s

93.60 GTexel/s

Texture Rate

82.56 GTexel/s

-

2.995 TFLOPS

FP32 (float)

1.981 TFLOPS

748.8 GFLOPS

FP64 (double)

82.56 GFLOPS

Board Design

185W

TDP

140W

450 W

Suggested PSU

300 W

1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2

Outputs

2x DVI 1x HDMI 1.4a 1x DisplayPort 1.2

2x 6-pin

Power Connectors

1x 6-pin

Graphics Processor

Tahiti

GPU Name

GK106

Tahiti LE (215-0821122)

GPU Variant

GK106-400-A1

GCN 1.0

Architecture

Kepler

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

4.313 billion

Transistors

2.54 billion

352 mm²

Die Size

221 mm²

Graphics Features

12 (11_1)

DirectX

12 (11_0)

4.6

OpenGL

4.6

1.2

OpenCL

3.0

1.2

Vulkan

1.1

-

CUDA

3.0

5.1

Shader Model

5.1

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