AMD Radeon R9 390X vs NVIDIA GeForce GTX 660

VS

AMD Radeon R9 390X

NVIDIA GeForce GTX 660

We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390X 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 R9 390X 's Advantages

Released 2 years and 9 months late

More VRAM (8GB vs 2GB)

Larger VRAM bandwidth (384.0GB/s vs 144.2GB/s)

1856 additional rendering cores

NVIDIA GeForce GTX 660 's Advantages

Boost Clock1032MHz

Lower TDP (140W vs 275W)

Score

Benchmark

FP32 (float)

Radeon R9 390X +198%

5.914 TFLOPS

GeForce GTX 660

1.981 TFLOPS

3DMark Time Spy

Radeon R9 390X +224%

4245

GeForce GTX 660

1308

Radeon R9 390X

VS

GeForce GTX 660

Graphics Card

Jun 2015

Release Date

Sep 2012

Pirate Islands

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

980 MHz

-

Boost Clock

1032 MHz

1500 MHz

Memory Clock

1502 MHz

Memory

8GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

512bit

Memory Bus

192bit

384.0GB/s

Bandwidth

144.2GB/s

Render Config

44

Compute Units

-

2816

Shading Units

960

176

TMUs

80

64

ROPs

24

-

16 KB (per CU)

L1 Cache

16 KB (per SMX)

1024 KB

L2 Cache

384 KB

-

Theoretical Performance

67.20 GPixel/s

Pixel Rate

20.64 GPixel/s

184.8 GTexel/s

Texture Rate

82.56 GTexel/s

-

5.914 TFLOPS

FP32 (float)

1.981 TFLOPS

739.2 GFLOPS

FP64 (double)

82.56 GFLOPS

Board Design

275W

TDP

140W

600 W

Suggested PSU

300 W

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

Outputs

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

1x 6-pin + 1x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Grenada

GPU Name

GK106

Grenada XT (215-0880004)

GPU Variant

GK106-400-A1

GCN 2.0

Architecture

Kepler

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

6.2 billion

Transistors

2.54 billion

438 mm²

Die Size

221 mm²

Graphics Features

12 (12_0)

DirectX

12 (11_0)

4.6

OpenGL

4.6

2.0

OpenCL

3.0

1.2

Vulkan

1.1

-

CUDA

3.0

6.3

Shader Model

5.1

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