AMD Radeon R9 390X vs AMD Radeon R9 285

VS

AMD Radeon R9 390X

AMD Radeon R9 285

We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390X and 2GB VRAM Radeon R9 285 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 390X 's Advantages

Released 9 months late

More VRAM (8GB vs 2GB)

Larger VRAM bandwidth (384.0GB/s vs 176.0GB/s)

1024 additional rendering cores

AMD Radeon R9 285 's Advantages

Lower TDP (190W vs 275W)

Score

Benchmark

FP32 (float)

Radeon R9 390X +79%

5.914 TFLOPS

Radeon R9 285

3.29 TFLOPS

Radeon R9 390X

VS

Radeon R9 285

Graphics Card

Jun 2015

Release Date

Sep 2014

Pirate Islands

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1500 MHz

Memory Clock

1375 MHz

Memory

8GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

512bit

Memory Bus

256bit

384.0GB/s

Bandwidth

176.0GB/s

Render Config

44

Compute Units

28

-

2816

Shading Units

1792

176

TMUs

112

64

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

1024 KB

L2 Cache

512 KB

-

Theoretical Performance

67.20 GPixel/s

Pixel Rate

29.38 GPixel/s

184.8 GTexel/s

Texture Rate

102.8 GTexel/s

-

FP16 (half)

3.290 TFLOPS

5.914 TFLOPS

FP32 (float)

3.290 TFLOPS

739.2 GFLOPS

FP64 (double)

205.6 GFLOPS

Board Design

275W

TDP

190W

600 W

Suggested PSU

450 W

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

Outputs

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

1x 6-pin + 1x 8-pin

Power Connectors

2x 6-pin

Graphics Processor

Grenada

GPU Name

Tonga

Grenada XT (215-0880004)

GPU Variant

Tonga PRO (215-0851128)

GCN 2.0

Architecture

GCN 3.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

6.2 billion

Transistors

5 billion

438 mm²

Die Size

366 mm²

Graphics Features

12 (12_0)

DirectX

12 (12_0)

4.6

OpenGL

4.6

2.0

OpenCL

2.1

1.2

Vulkan

1.2.170

-

6.3

Shader Model

6.5

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