AMD Radeon R9 255 OEM vs AMD Radeon R9 390X

VS

AMD Radeon R9 255 OEM

AMD Radeon R9 390X

We compared two Desktop platform GPUs: 2GB VRAM Radeon R9 255 OEM and 8GB VRAM Radeon R9 390X 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 275W)

AMD Radeon R9 390X 's Advantages

Released 1 years and 6 months late

More VRAM (8GB vs 2GB)

Larger VRAM bandwidth (384.0GB/s vs 73.60GB/s)

2304 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon R9 255 OEM

0.952 TFLOPS

Radeon R9 390X +521%

5.914 TFLOPS

Radeon R9 255 OEM

VS

Radeon R9 390X

Graphics Card

Dec 2013

Release Date

Jun 2015

Volcanic Islands

Generation

Pirate 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

1500 MHz

Memory

2GB

Memory Size

8GB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

512bit

73.60GB/s

Bandwidth

384.0GB/s

Render Config

8

Compute Units

44

-

512

Shading Units

2816

32

TMUs

176

16

ROPs

64

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

1024 KB

-

Theoretical Performance

14.88 GPixel/s

Pixel Rate

67.20 GPixel/s

29.76 GTexel/s

Texture Rate

184.8 GTexel/s

-

952.3 GFLOPS

FP32 (float)

5.914 TFLOPS

59.52 GFLOPS

FP64 (double)

739.2 GFLOPS

Board Design

65W

TDP

275W

250 W

Suggested PSU

600 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

Grenada

Cape Verde PRX

GPU Variant

Grenada XT (215-0880004)

GCN 1.0

Architecture

GCN 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

1.5 billion

Transistors

6.2 billion

123 mm²

Die Size

438 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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