AMD Radeon R9 255 OEM vs AMD Radeon R9 285X

VS

AMD Radeon R9 255 OEM

AMD Radeon R9 285X

We compared two Desktop platform GPUs: 2GB VRAM Radeon R9 255 OEM and 3GB VRAM Radeon R9 285X to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 255 OEM 's Advantages

Boost Clock930MHz

Lower TDP (65W vs 200W)

AMD Radeon R9 285X 's Advantages

More VRAM (3GB vs 2GB)

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

1536 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon R9 255 OEM

0.952 TFLOPS

Radeon R9 285X +331%

4.104 TFLOPS

Radeon R9 255 OEM

VS

Radeon R9 285X

Graphics Card

Dec 2013

Release Date

Unknown

Volcanic Islands

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

900 MHz

Base Clock

-

930 MHz

Boost Clock

-

1150 MHz

Memory Clock

1375 MHz

Memory

2GB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

384bit

73.60GB/s

Bandwidth

264.0GB/s

Render Config

8

Compute Units

32

-

512

Shading Units

2048

32

TMUs

128

16

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

768 KB

-

Theoretical Performance

14.88 GPixel/s

Pixel Rate

32.06 GPixel/s

29.76 GTexel/s

Texture Rate

128.3 GTexel/s

-

952.3 GFLOPS

FP32 (float)

4.104 TFLOPS

59.52 GFLOPS

FP64 (double)

-

Board Design

65W

TDP

200W

250 W

Suggested PSU

550 W

No outputs

Outputs

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

1x 6-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

Cape Verde

GPU Name

Tonga

Cape Verde PRX

GPU Variant

Tonga XT (215-0851313)

GCN 1.0

Architecture

GCN 3.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

1.5 billion

Transistors

5 billion

123 mm²

Die Size

366 mm²

Graphics Features

12 (11_1)

DirectX

12 (12_0)

4.6

OpenGL

4.6

1.2

OpenCL

2.0

1.2

Vulkan

1.2

-

5.1

Shader Model

6.3

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