AMD Radeon HD 8870 OEM vs AMD Radeon R9 255 OEM

VS

AMD Radeon HD 8870 OEM

AMD Radeon R9 255 OEM

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 8870 OEM 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 8870 OEM 's Advantages

Larger VRAM bandwidth (153.6GB/s vs 73.60GB/s)

768 additional rendering cores

AMD Radeon R9 255 OEM 's Advantages

Released 11 months late

Boost Clock930MHz

Lower TDP (65W vs 175W)

Score

Benchmark

FP32 (float)

Radeon HD 8870 OEM +168%

2.56 TFLOPS

Radeon R9 255 OEM

0.952 TFLOPS

Radeon HD 8870 OEM

VS

Radeon R9 255 OEM

Graphics Card

Jan 2013

Release Date

Dec 2013

Sea 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

1200 MHz

Memory Clock

1150 MHz

Memory

2GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

128bit

153.6GB/s

Bandwidth

73.60GB/s

Render Config

20

Compute Units

8

-

1280

Shading Units

512

80

TMUs

32

ROPs

16

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

256 KB

-

Theoretical Performance

32.00 GPixel/s

Pixel Rate

14.88 GPixel/s

80.00 GTexel/s

Texture Rate

29.76 GTexel/s

-

2.560 TFLOPS

FP32 (float)

952.3 GFLOPS

160.0 GFLOPS

FP64 (double)

59.52 GFLOPS

Board Design

175W

TDP

65W

450 W

Suggested PSU

250 W

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

Outputs

No outputs

2x 6-pin

Power Connectors

1x 6-pin

Graphics Processor

Pitcairn

GPU Name

Cape Verde

Pitcairn XT (215-0828047)

GPU Variant

Cape Verde PRX

GCN 1.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

2.8 billion

Transistors

1.5 billion

212 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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