AMD Radeon R9 255 OEM vs NVIDIA GeForce GTX 660 Rev. 2

VS

AMD Radeon R9 255 OEM

NVIDIA GeForce GTX 660 Rev. 2

We compared two Desktop platform GPUs: 2GB VRAM Radeon R9 255 OEM and 2GB VRAM GeForce GTX 660 Rev. 2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 255 OEM 's Advantages

Lower TDP (65W vs 140W)

NVIDIA GeForce GTX 660 Rev. 2 's Advantages

Released 9 months late

Boost Clock has increased by 11% (1032MHz vs 930MHz)

Larger VRAM bandwidth (144.2GB/s vs 73.60GB/s)

448 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon R9 255 OEM

0.952 TFLOPS

GeForce GTX 660 Rev. 2 +108%

1.981 TFLOPS

Radeon R9 255 OEM

VS

GeForce GTX 660 Rev. 2

Graphics Card

Dec 2013

Release Date

Sep 2014

Volcanic Islands

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

900 MHz

Base Clock

980 MHz

930 MHz

Boost Clock

1032 MHz

1150 MHz

Memory Clock

1502 MHz

Memory

2GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

192bit

73.60GB/s

Bandwidth

144.2GB/s

Render Config

8

Compute Units

-

512

Shading Units

960

32

TMUs

80

16

ROPs

24

-

16 KB (per CU)

L1 Cache

16 KB (per SMX)

256 KB

L2 Cache

384 KB

-

Theoretical Performance

14.88 GPixel/s

Pixel Rate

20.64 GPixel/s

29.76 GTexel/s

Texture Rate

82.56 GTexel/s

-

952.3 GFLOPS

FP32 (float)

1.981 TFLOPS

59.52 GFLOPS

FP64 (double)

82.56 GFLOPS

Board Design

65W

TDP

140W

250 W

Suggested PSU

300 W

No outputs

Outputs

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

1x 6-pin

Power Connectors

1x 6-pin

Graphics Processor

Cape Verde

GPU Name

GK104

Cape Verde PRX

GPU Variant

-

GCN 1.0

Architecture

Kepler

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

1.5 billion

Transistors

3.54 billion

123 mm²

Die Size

294 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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