AMD Radeon HD 7970 X2 vs AMD Radeon R9 255 OEM

VS

AMD Radeon HD 7970 X2

AMD Radeon R9 255 OEM

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7970 X2 and 2GB VRAM Radeon R9 255 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7970 X2 's Advantages

More VRAM (3GB vs 2GB)

Larger VRAM bandwidth (264.0GB/s vs 73.60GB/s)

1536 additional rendering cores

AMD Radeon R9 255 OEM 's Advantages

Released 1 years and 4 months late

Boost Clock930MHz

Lower TDP (65W vs 500W)

Score

Benchmark

FP32 (float)

Radeon HD 7970 X2 +298%

3.789 TFLOPS

Radeon R9 255 OEM

0.952 TFLOPS

Radeon HD 7970 X2

VS

Radeon R9 255 OEM

Graphics Card

Aug 2012

Release Date

Dec 2013

Southern Islands

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

900 MHz

-

Boost Clock

930 MHz

1375 MHz

Memory Clock

1150 MHz

Memory

3GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

128bit

264.0GB/s

Bandwidth

73.60GB/s

Render Config

32

Compute Units

8

-

2048

Shading Units

512

128

TMUs

32

ROPs

16

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

768 KB

L2 Cache

256 KB

-

Theoretical Performance

29.60 GPixel/s

Pixel Rate

14.88 GPixel/s

118.4 GTexel/s

Texture Rate

29.76 GTexel/s

-

3.789 TFLOPS

FP32 (float)

952.3 GFLOPS

947.2 GFLOPS

FP64 (double)

59.52 GFLOPS

Board Design

500W

TDP

65W

900 W

Suggested PSU

250 W

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

Outputs

No outputs

3x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

New Zealand

GPU Name

Cape Verde

-

GPU Variant

Cape Verde PRX

GCN 1.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

4.313 billion

Transistors

1.5 billion

352 mm²

Die Size

123 mm²

Graphics Features

12 (11_1)

DirectX

12 (11_1)

4.6

OpenGL

4.6

1.2

OpenCL

1.2

Vulkan

1.2

-

5.1

Shader Model

5.1

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