AMD Radeon R9 255 OEM vs AMD Radeon HD 6870 X2

VS

AMD Radeon R9 255 OEM

AMD Radeon HD 6870 X2

We compared two Desktop platform GPUs: 2GB VRAM Radeon R9 255 OEM and 1024MB VRAM Radeon HD 6870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 255 OEM 's Advantages

Released 2 years and 5 months late

Boost Clock930MHz

More VRAM (2GB vs 1024GB)

Lower TDP (65W vs 300W)

AMD Radeon HD 6870 X2 's Advantages

Larger VRAM bandwidth (134.4GB/s vs 73.60GB/s)

608 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon R9 255 OEM

0.952 TFLOPS

Radeon HD 6870 X2 +111%

2.016 TFLOPS

Radeon R9 255 OEM

VS

Radeon HD 6870 X2

Graphics Card

Dec 2013

Release Date

Jul 2011

Volcanic Islands

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

900 MHz

Base Clock

-

930 MHz

Boost Clock

-

1150 MHz

Memory Clock

1050 MHz

Memory

2GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

256bit

73.60GB/s

Bandwidth

134.4GB/s

Render Config

8

Compute Units

14

-

512

Shading Units

1120

32

TMUs

56

16

ROPs

32

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

512 KB

-

Theoretical Performance

14.88 GPixel/s

Pixel Rate

28.80 GPixel/s

29.76 GTexel/s

Texture Rate

50.40 GTexel/s

-

952.3 GFLOPS

FP32 (float)

2.016 TFLOPS

59.52 GFLOPS

FP64 (double)

-

Board Design

65W

TDP

300W

250 W

Suggested PSU

700 W

No outputs

Outputs

2x DVI 1x HDMI 1.3a 2x mini-DisplayPort 1.1

1x 6-pin

Power Connectors

-

Graphics Processor

Cape Verde

GPU Name

Barts

Cape Verde PRX

GPU Variant

Barts XT (215-0798000)

GCN 1.0

Architecture

TeraScale 2

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

1.5 billion

Transistors

1.7 billion

123 mm²

Die Size

255 mm²

Graphics Features

12 (11_1)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

1.2

OpenCL

1.2

Vulkan

N/A

-

5.1

Shader Model

5.0

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